strace.c revision d0ffdf494ac722f3d121c6e807f105000409e6a6
176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman/* 276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl> 376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl> 476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com> 54dc8a2aec63e4fb5ee2688544c4de323ed5de3efWichert Akkerman * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl> 676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * All rights reserved. 776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * 876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * Redistribution and use in source and binary forms, with or without 976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * modification, are permitted provided that the following conditions 1076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * are met: 1176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * 1. Redistributions of source code must retain the above copyright 1276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * notice, this list of conditions and the following disclaimer. 1376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * 2. Redistributions in binary form must reproduce the above copyright 1476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * notice, this list of conditions and the following disclaimer in the 1576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * documentation and/or other materials provided with the distribution. 1676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * 3. The name of the author may not be used to endorse or promote products 1776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * derived from this software without specific prior written permission. 1876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * 1976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 2076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 2176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 2276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 2376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 2476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 2876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman */ 3076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 3176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman#include "defs.h" 323454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko#include <stdarg.h> 3376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman#include <sys/param.h> 3476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman#include <fcntl.h> 3576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman#include <sys/resource.h> 3676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman#include <sys/wait.h> 3776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman#include <sys/stat.h> 3876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman#include <pwd.h> 3976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman#include <grp.h> 4070b08530b80a6ee6591c38cf397fe0eeba1b4d7aRoland McGrath#include <dirent.h> 41f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko#include <sys/utsname.h> 42882478a0724c04287ac232c212312c8e094cce43Dmitry V. Levin#ifdef HAVE_PRCTL 43882478a0724c04287ac232c212312c8e094cce43Dmitry V. Levin# include <sys/prctl.h> 44882478a0724c04287ac232c212312c8e094cce43Dmitry V. Levin#endif 458470374cba7df0e70653d95c4f336a4082c68d82Denys Vlasenko#if defined(IA64) 467b3346be42d6a1f539e95d385ee498f8b3c529f8Wichert Akkerman# include <asm/ptrace_offsets.h> 477b3346be42d6a1f539e95d385ee498f8b3c529f8Wichert Akkerman#endif 48a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko/* In some libc, these aren't declared. Do it ourself: */ 4996d5a76109b4f1d1f4c9c76641e6ec896108083dDenys Vlasenkoextern char **environ; 50418d66a847bda4867c59e604c0d07c64ed53e320Denys Vlasenkoextern int optind; 51418d66a847bda4867c59e604c0d07c64ed53e320Denys Vlasenkoextern char *optarg; 5296d5a76109b4f1d1f4c9c76641e6ec896108083dDenys Vlasenko 53a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko 54a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko#if defined __NR_tkill 55a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko# define my_tkill(tid, sig) syscall(__NR_tkill, (tid), (sig)) 56a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko#else 57a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko /* kill() may choose arbitrarily the target task of the process group 58a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko while we later wait on a that specific TID. PID process waits become 59a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko TID task specific waits for a process under ptrace(2). */ 60978fbc901c4fe260caaa5881e54bd9cb54022101Denys Vlasenko# warning "tkill(2) not available, risk of strace hangs!" 61a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko# define my_tkill(tid, sig) kill((tid), (sig)) 62a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko#endif 63a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko 645c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko/* Glue for systems without a MMU that cannot provide fork() */ 655c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko#if !defined(HAVE_FORK) 665c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko# undef NOMMU_SYSTEM 675c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko# define NOMMU_SYSTEM 1 685c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko#endif 695c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko#if NOMMU_SYSTEM 705c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko# define fork() vfork() 715c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko#endif 725c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko 73a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenkocflag_t cflag = CFLAG_NONE; 74a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenkounsigned int followfork = 0; 75f44cce48bbbd573cc5ae801f69f857433160b03aDenys Vlasenkounsigned int ptrace_setoptions = 0; 76a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenkounsigned int xflag = 0; 778d4ca0c8cd81329ad730ab52b1e0653c1bbea803Denys Vlasenkobool need_fork_exec_workarounds = 0; 78a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenkobool debug_flag = 0; 79a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenkobool Tflag = 0; 8001997cf32d4492b9898283ced45e8a4a6fd161b8Daniel P. Berrangeunsigned int qflag = 0; 813454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko/* Which WSTOPSIG(status) value marks syscall traps? */ 8275422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenkostatic unsigned int syscall_trap_sig = SIGTRAP; 83a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenkostatic unsigned int tflag = 0; 84a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenkostatic bool iflag = 0; 85a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenkostatic bool rflag = 0; 86a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenkostatic bool print_pid_pfx = 0; 87b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko 88b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko/* -I n */ 89b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenkoenum { 90b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko INTR_NOT_SET = 0, 91b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko INTR_ANYWHERE = 1, /* don't block/ignore any signals */ 92b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko INTR_WHILE_WAIT = 2, /* block fatal signals while decoding syscall. default */ 93b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko INTR_NEVER = 3, /* block fatal signals. default if '-o FILE PROG' */ 94b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko INTR_BLOCK_TSTP_TOO = 4, /* block fatal signals and SIGTSTP (^Z) */ 95b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko NUM_INTR_OPTS 96b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko}; 97b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenkostatic int opt_intr; 98b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko/* We play with signal mask only if this mode is active: */ 99b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko#define interactive (opt_intr == INTR_WHILE_WAIT) 100b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko 101ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko/* 102ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko * daemonized_tracer supports -D option. 103ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko * With this option, strace forks twice. 104ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko * Unlike normal case, with -D *grandparent* process exec's, 105ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko * becoming a traced process. Child exits (this prevents traced process 106ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko * from having children it doesn't expect to have), and grandchild 107ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko * attaches to grandparent similarly to strace -p PID. 108ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko * This allows for more transparent interaction in cases 109ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko * when process and its parent are communicating via signals, 110ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko * wait() etc. Without -D, strace process gets lodged in between, 111ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko * disrupting parent<->child link. 112ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko */ 113ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenkostatic bool daemonized_tracer = 0; 11476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 1155c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko#if USE_SEIZE 11631fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenkostatic int post_attach_sigstop = TCB_IGNORE_ONE_SIGSTOP; 11731fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko# define use_seize (post_attach_sigstop == 0) 11831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko#else 11931fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko# define post_attach_sigstop TCB_IGNORE_ONE_SIGSTOP 12031fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko# define use_seize 0 12131fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko#endif 12231fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 12317f8fb3484e94976882f65b7a3aaffc6f24cd75dMichal Ludvig/* Sometimes we want to print only succeeding syscalls. */ 124a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenkobool not_failing_only = 0; 12517f8fb3484e94976882f65b7a3aaffc6f24cd75dMichal Ludvig 1268a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards/* Show path associated with fd arguments */ 127a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenkobool show_fd_path = 0; 1288a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards 12961e7aad9fa1a6a5bd5a586e6276767caf12b53f2Denys Vlasenkostatic bool detach_on_execve = 0; 1302a3d27552f17a5b378344620bec7d255bac65a8dDenys Vlasenko/* Are we "strace PROG" and need to skip detach on first execve? */ 1312a3d27552f17a5b378344620bec7d255bac65a8dDenys Vlasenkostatic bool skip_one_b_execve = 0; 1322a3d27552f17a5b378344620bec7d255bac65a8dDenys Vlasenko/* Are we "strace PROG" and need to hide everything until execve? */ 1332a3d27552f17a5b378344620bec7d255bac65a8dDenys Vlasenkobool hide_log_until_execve = 0; 13461e7aad9fa1a6a5bd5a586e6276767caf12b53f2Denys Vlasenko 135a68096576afc07e51d33b49c432d658b27a7f13cDmitry V. Levinstatic int exit_code = 0; 136a68096576afc07e51d33b49c432d658b27a7f13cDmitry V. Levinstatic int strace_child = 0; 13775422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenkostatic int strace_tracer_pid = 0; 138eb9e2e8904ce85a6c7390be25bb873c6db88c4d3Roland McGrath 139b9fe011cdfb0a3014e68a6e82007b6c2703a340bDmitry V. Levinstatic char *username = NULL; 140ead73bd3493c517fde508aecf6bc097aeae1752cDenys Vlasenkostatic uid_t run_uid; 141ead73bd3493c517fde508aecf6bc097aeae1752cDenys Vlasenkostatic gid_t run_gid; 14276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 143a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenkounsigned int max_strlen = DEFAULT_STRLEN; 144ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levinstatic int acolumn = DEFAULT_ACOLUMN; 145102ec4935440ff52a7fa3566154a84cc2473f16aDenys Vlasenkostatic char *acolumn_spaces; 1466764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko 147b9fe011cdfb0a3014e68a6e82007b6c2703a340bDmitry V. Levinstatic char *outfname = NULL; 1486764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko/* If -ff, points to stderr. Else, it's our common output log */ 1496764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenkostatic FILE *shared_log; 1506764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko 151000b601439d249a4afa2ceb6096850a702612d1eDenys Vlasenkostruct tcb *printing_tcp = NULL; 1526764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenkostatic struct tcb *current_tcp; 1536764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko 154ead73bd3493c517fde508aecf6bc097aeae1752cDenys Vlasenkostatic struct tcb **tcbtab; 1552b60c35b33cf22a88405c60db1e620880d05a7d4Denys Vlasenkostatic unsigned int nprocs, tcbtabsize; 156ead73bd3493c517fde508aecf6bc097aeae1752cDenys Vlasenkostatic const char *progname; 15776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 158eec8d5d6b028665a73169fda96e4e873cb8351f0Denys Vlasenkounsigned os_release; /* generated from uname()'s u.release */ 159f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko 1604a9ba989e65c12c50286a8423196236e6bac529dDenys Vlasenkostatic void detach(struct tcb *tcp); 161e5355de95c495dcfc616509f88c4fb5f9996b8e6Andreas Schwabstatic void cleanup(void); 162e5355de95c495dcfc616509f88c4fb5f9996b8e6Andreas Schwabstatic void interrupt(int sig); 16376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkermanstatic sigset_t empty_set, blocked_set; 16476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 16576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman#ifdef HAVE_SIG_ATOMIC_T 16676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkermanstatic volatile sig_atomic_t interrupted; 167a3559250d48ccc3ef755183ebb3246cbbb442c0dDenys Vlasenko#else 16876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkermanstatic volatile int interrupted; 169a3559250d48ccc3ef755183ebb3246cbbb442c0dDenys Vlasenko#endif 17076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 1712c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko#ifndef HAVE_STRERROR 1722c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko 1732c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko#if !HAVE_DECL_SYS_ERRLIST 1742c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenkoextern int sys_nerr; 1752c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenkoextern char *sys_errlist[]; 176a6d91ded3f2d5401e09a9c2fa442aabfbfe593a8Denys Vlasenko#endif 1772c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko 1782c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenkoconst char * 1792c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenkostrerror(int err_no) 1802c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko{ 1812c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko static char buf[sizeof("Unknown error %d") + sizeof(int)*3]; 1822c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko 1832c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko if (err_no < 1 || err_no >= sys_nerr) { 1842c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko sprintf(buf, "Unknown error %d", err_no); 1852c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko return buf; 1862c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko } 1872c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko return sys_errlist[err_no]; 1882c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko} 1892c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko 1902c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko#endif /* HAVE_STERRROR */ 1912c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko 19276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkermanstatic void 193cb2ad00652e746b370703b5470932b7612308b9cDenys Vlasenkousage(FILE *ofp, int exitval) 19476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman{ 19576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman fprintf(ofp, "\ 196c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenkousage: strace [-CdffhiqrtttTvVxxy] [-I n] [-e expr]...\n\ 197c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko [-a column] [-o file] [-s strsize] [-P path]...\n\ 198c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko -p pid... / [-D] [-E var=val]... [-u username] PROG [ARGS]\n\ 199c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko or: strace -c[df] [-I n] [-e expr]... [-O overhead] [-S sortby]\n\ 200c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko -p pid... / [-D] [-E var=val]... [-u username] PROG [ARGS]\n\ 20176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-c -- count time, calls, and errors for each syscall and report summary\n\ 202c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko-C -- like -c but also print regular output\n\ 2033e084ac349c3b177a75916254a4a5a02f29969e2Denys Vlasenko-d -- enable debug output to stderr\n\ 204b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko-D -- run tracer process as a detached grandchild, not as parent\n\ 20576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-f -- follow forks, -ff -- with output into separate files\n\ 20676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-i -- print instruction pointer at time of syscall\n\ 20776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-q -- suppress messages about attaching, detaching, etc.\n\ 20876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-r -- print relative timestamp, -t -- absolute timestamp, -tt -- with usecs\n\ 209cdab1becb03eeae442719027fc26a17da464e5deDenys Vlasenko-T -- print time spent in each syscall\n\ 210cdab1becb03eeae442719027fc26a17da464e5deDenys Vlasenko-v -- verbose mode: print unabbreviated argv, stat, termios, etc. args\n\ 21176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-x -- print non-ascii strings in hex, -xx -- print all strings in hex\n\ 2128a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards-y -- print paths associated with file descriptor arguments\n\ 213c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko-h -- print help message, -V -- print version\n\ 21476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-a column -- alignment COLUMN for printing syscall results (default %d)\n\ 21522efaf0028ddec8f9ed2a2a11e9baaa201594a33Denys Vlasenko-b execve -- detach on this syscall\n\ 21676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-e expr -- a qualifying expression: option=[!]all or option=[!]val1[,val2]...\n\ 21738e79bbb25bca8b79ae2866b93c4ddf26dea2b13Denys Vlasenko options: trace, abbrev, verbose, raw, signal, read, write\n\ 218c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko-I interruptible --\n\ 219c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko 1: no signals are blocked\n\ 220c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko 2: fatal signals are blocked while decoding syscall (default)\n\ 221c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko 3: fatal signals are always blocked (default if '-o FILE PROG')\n\ 222c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko 4: fatal signals and SIGTSTP (^Z) are always blocked\n\ 223c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko (useful to make 'strace -o FILE PROG' not stop on ^Z)\n\ 22476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-o file -- send trace output to FILE instead of stderr\n\ 22576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-O overhead -- set overhead for tracing syscalls to OVERHEAD usecs\n\ 22676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-p pid -- trace process with process id PID, may be repeated\n\ 22776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-s strsize -- limit length of print strings to STRSIZE chars (default %d)\n\ 22876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-S sortby -- sort syscall counts by: time, calls, name, nothing (default %s)\n\ 22976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-u username -- run command as username handling setuid and/or setgid\n\ 230de6e53308ca58da7d357f8114afc74fff7a18043Roland McGrath-E var=val -- put var=val in the environment for command\n\ 231de6e53308ca58da7d357f8114afc74fff7a18043Roland McGrath-E var -- remove var from the environment for command\n\ 2328a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards-P path -- trace accesses to path\n\ 23361e7aad9fa1a6a5bd5a586e6276767caf12b53f2Denys Vlasenko" 23438e79bbb25bca8b79ae2866b93c4ddf26dea2b13Denys Vlasenko/* ancient, no one should use it 23538e79bbb25bca8b79ae2866b93c4ddf26dea2b13Denys Vlasenko-F -- attempt to follow vforks (deprecated, use -f)\n\ 23638e79bbb25bca8b79ae2866b93c4ddf26dea2b13Denys Vlasenko */ 23761e7aad9fa1a6a5bd5a586e6276767caf12b53f2Denys Vlasenko/* this is broken, so don't document it 23817f8fb3484e94976882f65b7a3aaffc6f24cd75dMichal Ludvig-z -- print only succeeding syscalls\n\ 23961e7aad9fa1a6a5bd5a586e6276767caf12b53f2Denys Vlasenko */ 240de6e53308ca58da7d357f8114afc74fff7a18043Roland McGrath, DEFAULT_ACOLUMN, DEFAULT_STRLEN, DEFAULT_SORTBY); 24176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman exit(exitval); 24276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman} 24376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 24475422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenkostatic void die(void) __attribute__ ((noreturn)); 24575422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenkostatic void die(void) 24675422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko{ 24775422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko if (strace_tracer_pid == getpid()) { 24875422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko cflag = 0; 24975422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko cleanup(); 25075422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko } 25175422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko exit(1); 25275422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko} 25375422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko 25475422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenkostatic void verror_msg(int err_no, const char *fmt, va_list p) 2553454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko{ 25682bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko char *msg; 25782bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko 25844d053218ba658c901c3ab7dd905ab31ba417286Dmitry V. Levin fflush(NULL); 25982bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko 26082bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko /* We want to print entire message with single fprintf to ensure 26182bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko * message integrity if stderr is shared with other programs. 26282bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko * Thus we use vasprintf + single fprintf. 26382bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko */ 26482bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko msg = NULL; 265cfad543087d98c5313fd7f006c0de69a1d87dc8eDenys Vlasenko if (vasprintf(&msg, fmt, p) >= 0) { 26682bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko if (err_no) 26782bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko fprintf(stderr, "%s: %s: %s\n", progname, msg, strerror(err_no)); 26882bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko else 26982bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko fprintf(stderr, "%s: %s\n", progname, msg); 27082bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko free(msg); 27182bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko } else { 27282bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko /* malloc in vasprintf failed, try it without malloc */ 27382bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko fprintf(stderr, "%s: ", progname); 27482bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko vfprintf(stderr, fmt, p); 27582bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko if (err_no) 27682bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko fprintf(stderr, ": %s\n", strerror(err_no)); 27782bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko else 27882bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko putc('\n', stderr); 27982bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko } 28082bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko /* We don't switch stderr to buffered, thus fprintf(stderr) 28182bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko * always flushes its output and this is not necessary: */ 28282bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko /* fflush(stderr); */ 28375422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko} 28475422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko 28575422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenkovoid error_msg(const char *fmt, ...) 28675422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko{ 28775422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko va_list p; 28875422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko va_start(p, fmt); 28975422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko verror_msg(0, fmt, p); 2903454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko va_end(p); 29175422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko} 2923454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko 29375422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenkovoid error_msg_and_die(const char *fmt, ...) 29475422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko{ 29575422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko va_list p; 29675422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko va_start(p, fmt); 29775422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko verror_msg(0, fmt, p); 29875422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko die(); 29975422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko} 30075422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko 30175422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenkovoid perror_msg(const char *fmt, ...) 30275422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko{ 30375422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko va_list p; 30475422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko va_start(p, fmt); 30575422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko verror_msg(errno, fmt, p); 30675422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko va_end(p); 30775422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko} 30875422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko 30975422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenkovoid perror_msg_and_die(const char *fmt, ...) 31075422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko{ 31175422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko va_list p; 31275422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko va_start(p, fmt); 31375422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko verror_msg(errno, fmt, p); 31475422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko die(); 3153454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko} 3163454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko 3171d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenkovoid die_out_of_memory(void) 3181d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko{ 3191d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko static bool recursed = 0; 3201d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko if (recursed) 3211d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko exit(1); 3221d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko recursed = 1; 3231d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko error_msg_and_die("Out of memory"); 3241d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko} 3251d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko 326ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levinstatic void 327ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levinerror_opt_arg(int opt, const char *arg) 328ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin{ 329ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin error_msg_and_die("Invalid -%c argument: '%s'", opt, arg); 330ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin} 331ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin 3325c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko#if USE_SEIZE 33331fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenkostatic int 33431fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenkoptrace_attach_or_seize(int pid) 33531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko{ 33631fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko int r; 33731fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (!use_seize) 33831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko return ptrace(PTRACE_ATTACH, pid, 0, 0); 33926bc0606d96d05d30ba263939a0451889340a64cDenys Vlasenko r = ptrace(PTRACE_SEIZE, pid, 0, 0); 34031fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (r) 34131fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko return r; 34231fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko r = ptrace(PTRACE_INTERRUPT, pid, 0, 0); 34331fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko return r; 34431fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko} 34531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko#else 34631fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko# define ptrace_attach_or_seize(pid) ptrace(PTRACE_ATTACH, (pid), 0, 0) 34731fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko#endif 34831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 349852f98a3824f6b8359df744af5772306410341abDenys Vlasenko/* 350852f98a3824f6b8359df744af5772306410341abDenys Vlasenko * Used when we want to unblock stopped traced process. 351852f98a3824f6b8359df744af5772306410341abDenys Vlasenko * Should be only used with PTRACE_CONT, PTRACE_DETACH and PTRACE_SYSCALL. 352852f98a3824f6b8359df744af5772306410341abDenys Vlasenko * Returns 0 on success or if error was ESRCH 353852f98a3824f6b8359df744af5772306410341abDenys Vlasenko * (presumably process was killed while we talk to it). 354852f98a3824f6b8359df744af5772306410341abDenys Vlasenko * Otherwise prints error message and returns -1. 355852f98a3824f6b8359df744af5772306410341abDenys Vlasenko */ 356852f98a3824f6b8359df744af5772306410341abDenys Vlasenkostatic int 357852f98a3824f6b8359df744af5772306410341abDenys Vlasenkoptrace_restart(int op, struct tcb *tcp, int sig) 358852f98a3824f6b8359df744af5772306410341abDenys Vlasenko{ 359852f98a3824f6b8359df744af5772306410341abDenys Vlasenko int err; 360852f98a3824f6b8359df744af5772306410341abDenys Vlasenko const char *msg; 361852f98a3824f6b8359df744af5772306410341abDenys Vlasenko 362852f98a3824f6b8359df744af5772306410341abDenys Vlasenko errno = 0; 363852f98a3824f6b8359df744af5772306410341abDenys Vlasenko ptrace(op, tcp->pid, (void *) 0, (long) sig); 364852f98a3824f6b8359df744af5772306410341abDenys Vlasenko err = errno; 365235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko if (!err) 366852f98a3824f6b8359df744af5772306410341abDenys Vlasenko return 0; 367852f98a3824f6b8359df744af5772306410341abDenys Vlasenko 368852f98a3824f6b8359df744af5772306410341abDenys Vlasenko msg = "SYSCALL"; 369852f98a3824f6b8359df744af5772306410341abDenys Vlasenko if (op == PTRACE_CONT) 370852f98a3824f6b8359df744af5772306410341abDenys Vlasenko msg = "CONT"; 371852f98a3824f6b8359df744af5772306410341abDenys Vlasenko if (op == PTRACE_DETACH) 372852f98a3824f6b8359df744af5772306410341abDenys Vlasenko msg = "DETACH"; 373852f98a3824f6b8359df744af5772306410341abDenys Vlasenko#ifdef PTRACE_LISTEN 374852f98a3824f6b8359df744af5772306410341abDenys Vlasenko if (op == PTRACE_LISTEN) 375852f98a3824f6b8359df744af5772306410341abDenys Vlasenko msg = "LISTEN"; 376852f98a3824f6b8359df744af5772306410341abDenys Vlasenko#endif 377235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko /* 378235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko * Why curcol != 0? Otherwise sometimes we get this: 379235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko * 380235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko * 10252 kill(10253, SIGKILL) = 0 381235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko * <ptrace(SYSCALL,10252):No such process>10253 ...next decode... 382235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko * 383235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko * 10252 died after we retrieved syscall exit data, 384235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko * but before we tried to restart it. Log looks ugly. 385235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko */ 3866764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko if (current_tcp && current_tcp->curcol != 0) { 387235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko tprintf(" <ptrace(%s):%s>\n", msg, strerror(err)); 388235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko line_ended(); 389235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko } 390235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko if (err == ESRCH) 391235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko return 0; 392235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko errno = err; 393852f98a3824f6b8359df744af5772306410341abDenys Vlasenko perror_msg("ptrace(PTRACE_%s,pid:%d,sig:%d)", msg, tcp->pid, sig); 394852f98a3824f6b8359df744af5772306410341abDenys Vlasenko return -1; 395852f98a3824f6b8359df744af5772306410341abDenys Vlasenko} 396852f98a3824f6b8359df744af5772306410341abDenys Vlasenko 3971f532ab27db945c33818ba5298fdd78c52d229eaDenys Vlasenkostatic void 39810de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levinset_cloexec_flag(int fd) 39910de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin{ 4001f532ab27db945c33818ba5298fdd78c52d229eaDenys Vlasenko int flags, newflags; 4011f532ab27db945c33818ba5298fdd78c52d229eaDenys Vlasenko 4021f532ab27db945c33818ba5298fdd78c52d229eaDenys Vlasenko flags = fcntl(fd, F_GETFD); 4031f532ab27db945c33818ba5298fdd78c52d229eaDenys Vlasenko if (flags < 0) { 4041f532ab27db945c33818ba5298fdd78c52d229eaDenys Vlasenko /* Can happen only if fd is bad. 4051f532ab27db945c33818ba5298fdd78c52d229eaDenys Vlasenko * Should never happen: if it does, we have a bug 4061f532ab27db945c33818ba5298fdd78c52d229eaDenys Vlasenko * in the caller. Therefore we just abort 4071f532ab27db945c33818ba5298fdd78c52d229eaDenys Vlasenko * instead of propagating the error. 4081f532ab27db945c33818ba5298fdd78c52d229eaDenys Vlasenko */ 4091f532ab27db945c33818ba5298fdd78c52d229eaDenys Vlasenko perror_msg_and_die("fcntl(%d, F_GETFD)", fd); 41010de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin } 41110de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 41210de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin newflags = flags | FD_CLOEXEC; 41310de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin if (flags == newflags) 4141f532ab27db945c33818ba5298fdd78c52d229eaDenys Vlasenko return; 41510de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 4161f532ab27db945c33818ba5298fdd78c52d229eaDenys Vlasenko fcntl(fd, F_SETFD, newflags); /* never fails */ 41710de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin} 41810de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 41975fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenkostatic void kill_save_errno(pid_t pid, int sig) 42075fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko{ 42175fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko int saved_errno = errno; 42275fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko 42375fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko (void) kill(pid, sig); 42475fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko errno = saved_errno; 42575fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko} 42675fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko 427800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko/* 428800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko * When strace is setuid executable, we have to swap uids 429800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko * before and after filesystem and process management operations. 430800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko */ 431800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkostatic void 432800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkoswap_uid(void) 433800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko{ 434800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko int euid = geteuid(), uid = getuid(); 435800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 436800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (euid != uid && setreuid(euid, uid) < 0) { 437800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko perror_msg_and_die("setreuid"); 438800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } 439800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko} 440800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 441800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko#if _LFS64_LARGEFILE 442800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko# define fopen_for_output fopen64 443c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin# define struct_stat struct stat64 444c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin# define stat_file stat64 445c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin# define struct_dirent struct dirent64 446c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin# define read_dir readdir64 447c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin# define struct_rlimit struct rlimit64 448c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin# define set_rlimit setrlimit64 449800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko#else 450800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko# define fopen_for_output fopen 451c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin# define struct_stat struct stat 452c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin# define stat_file stat 453c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin# define struct_dirent struct dirent 454c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin# define read_dir readdir 455c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin# define struct_rlimit struct rlimit 456c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin# define set_rlimit setrlimit 457800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko#endif 458800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 459800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkostatic FILE * 460800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkostrace_fopen(const char *path) 461800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko{ 462800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko FILE *fp; 463800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 464800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko swap_uid(); 465800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko fp = fopen_for_output(path, "w"); 466800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (!fp) 467800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko perror_msg_and_die("Can't fopen '%s'", path); 468800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko swap_uid(); 469800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko set_cloexec_flag(fileno(fp)); 470800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko return fp; 471800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko} 472800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 473800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkostatic int popen_pid = 0; 474800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 475800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko#ifndef _PATH_BSHELL 476800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko# define _PATH_BSHELL "/bin/sh" 477800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko#endif 478800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 479800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko/* 480800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko * We cannot use standard popen(3) here because we have to distinguish 481800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko * popen child process from other processes we trace, and standard popen(3) 482800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko * does not export its child's pid. 483800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko */ 484800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkostatic FILE * 485800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkostrace_popen(const char *command) 486800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko{ 487800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko FILE *fp; 488800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko int fds[2]; 489800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 490800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko swap_uid(); 491800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (pipe(fds) < 0) 492800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko perror_msg_and_die("pipe"); 493800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 494800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko set_cloexec_flag(fds[1]); /* never fails */ 495800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 496800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko popen_pid = vfork(); 497800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (popen_pid == -1) 498800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko perror_msg_and_die("vfork"); 499800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 500800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (popen_pid == 0) { 501800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko /* child */ 502800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko close(fds[1]); 503800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (fds[0] != 0) { 504800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (dup2(fds[0], 0)) 505800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko perror_msg_and_die("dup2"); 506800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko close(fds[0]); 507800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } 508800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko execl(_PATH_BSHELL, "sh", "-c", command, NULL); 509800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko perror_msg_and_die("Can't execute '%s'", _PATH_BSHELL); 510800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } 511800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 512800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko /* parent */ 513800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko close(fds[0]); 514800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko swap_uid(); 515800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko fp = fdopen(fds[1], "w"); 516800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (!fp) 517800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko die_out_of_memory(); 518800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko return fp; 519800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko} 520800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 5212e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenkovoid 5222e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenkotprintf(const char *fmt, ...) 5232e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko{ 5242e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko va_list args; 5252e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko 5262e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko va_start(args, fmt); 5276764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko if (current_tcp) { 5286e4f3c1fa41851cb72230432db4be8e0c2993c7dDenys Vlasenko int n = strace_vfprintf(current_tcp->outf, fmt, args); 5292e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko if (n < 0) { 5306764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko if (current_tcp->outf != stderr) 5319a71bcdab254e4cd93b8f1e93c659644eb70ea9bDmitry V. Levin perror_msg("%s", outfname); 5322e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko } else 5336764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko current_tcp->curcol += n; 5342e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko } 5352e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko va_end(args); 5362e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko} 5372e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko 5382e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenkovoid 5392e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenkotprints(const char *str) 5402e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko{ 5416764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko if (current_tcp) { 542142aee0a593ea9b42aa98347d998176b8a4e2489Denys Vlasenko int n = fputs_unlocked(str, current_tcp->outf); 5432e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko if (n >= 0) { 5446764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko current_tcp->curcol += strlen(str); 5452e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko return; 5462e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko } 5476764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko if (current_tcp->outf != stderr) 5489a71bcdab254e4cd93b8f1e93c659644eb70ea9bDmitry V. Levin perror_msg("%s", outfname); 5492e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko } 5502e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko} 5512e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko 5522e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenkovoid 5537de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenkoline_ended(void) 5547de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko{ 5556764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko if (current_tcp) { 5566764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko current_tcp->curcol = 0; 5576764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko fflush(current_tcp->outf); 5586764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko } 5596764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko if (printing_tcp) { 5606764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko printing_tcp->curcol = 0; 5616764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko printing_tcp = NULL; 5626764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko } 5637de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko} 5647de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko 5657de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenkovoid 5662e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenkoprintleader(struct tcb *tcp) 5672e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko{ 5687de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko /* If -ff, "previous tcb we printed" is always the same as current, 5697de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko * because we have per-tcb output files. 5707de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko */ 5717de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko if (followfork >= 2) 5727de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko printing_tcp = tcp; 5737de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko 5742e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko if (printing_tcp) { 5756764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko current_tcp = printing_tcp; 5767de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko if (printing_tcp->curcol != 0 && (followfork < 2 || printing_tcp == tcp)) { 5777de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko /* 5787de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko * case 1: we have a shared log (i.e. not -ff), and last line 5797de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko * wasn't finished (same or different tcb, doesn't matter). 5807de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko * case 2: split log, we are the same tcb, but our last line 5817de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko * didn't finish ("SIGKILL nuked us after syscall entry" etc). 5827de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko */ 5832e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko tprints(" <unfinished ...>\n"); 5847de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko printing_tcp->curcol = 0; 5852e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko } 5862e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko } 5872e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko 5882e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko printing_tcp = tcp; 5896764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko current_tcp = tcp; 5906764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko current_tcp->curcol = 0; 5912e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko 5922e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko if (print_pid_pfx) 5932e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko tprintf("%-5d ", tcp->pid); 5942e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko else if (nprocs > 1 && !outfname) 5952e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko tprintf("[pid %5u] ", tcp->pid); 5962e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko 5972e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko if (tflag) { 5982e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko char str[sizeof("HH:MM:SS")]; 5992e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko struct timeval tv, dtv; 6002e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko static struct timeval otv; 6012e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko 6022e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko gettimeofday(&tv, NULL); 6032e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko if (rflag) { 6042e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko if (otv.tv_sec == 0) 6052e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko otv = tv; 6062e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko tv_sub(&dtv, &tv, &otv); 6072e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko tprintf("%6ld.%06ld ", 6082e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko (long) dtv.tv_sec, (long) dtv.tv_usec); 6092e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko otv = tv; 6102e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko } 6112e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko else if (tflag > 2) { 6122e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko tprintf("%ld.%06ld ", 6132e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko (long) tv.tv_sec, (long) tv.tv_usec); 6142e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko } 6152e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko else { 6162e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko time_t local = tv.tv_sec; 6172e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko strftime(str, sizeof(str), "%T", localtime(&local)); 6182e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko if (tflag > 1) 6192e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko tprintf("%s.%06ld ", str, (long) tv.tv_usec); 6202e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko else 6212e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko tprintf("%s ", str); 6222e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko } 6232e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko } 6242e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko if (iflag) 6255a2483ba25fd80cb189abcdc14624be72b0c4c0bDenys Vlasenko print_pc(tcp); 6262e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko} 6272e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko 6282e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenkovoid 6292e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenkotabto(void) 6302e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko{ 6316764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko if (current_tcp->curcol < acolumn) 6326764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko tprints(acolumn_spaces + current_tcp->curcol); 6332e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko} 6342e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko 6353db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko/* Should be only called directly *after successful attach* to a tracee. 6363db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko * Otherwise, "strace -oFILE -ff -p<nonexistant_pid>" 6373db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko * may create bogus empty FILE.<nonexistant_pid>, and then die. 6383db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko */ 63910de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levinstatic void 640800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkonewoutf(struct tcb *tcp) 64110de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin{ 6426764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko tcp->outf = shared_log; /* if not -ff mode, the same file is for all */ 6433db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko if (followfork >= 2) { 644800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko char name[520 + sizeof(int) * 3]; 645800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko sprintf(name, "%.512s.%u", outfname, tcp->pid); 646800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko tcp->outf = strace_fopen(name); 64710de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin } 64810de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin} 64910de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 650800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkostatic void 651800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkoexpand_tcbtab(void) 652800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko{ 653800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko /* Allocate some more TCBs and expand the table. 654800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko We don't want to relocate the TCBs because our 655800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko callers have pointers and it would be a pain. 656800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko So tcbtab is a table of pointers. Since we never 657800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko free the TCBs, we allocate a single chunk of many. */ 658800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko int i = tcbtabsize; 659800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko struct tcb *newtcbs = calloc(tcbtabsize, sizeof(newtcbs[0])); 660800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko struct tcb **newtab = realloc(tcbtab, tcbtabsize * 2 * sizeof(tcbtab[0])); 661800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (!newtab || !newtcbs) 662800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko die_out_of_memory(); 663800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko tcbtabsize *= 2; 664800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko tcbtab = newtab; 665800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko while (i < tcbtabsize) 666800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko tcbtab[i++] = newtcbs++; 667800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko} 6684bfa6266eb6c67fce50907b427dff6bbd9e93794Roland McGrath 669800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkostatic struct tcb * 6703db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenkoalloctcb(int pid) 67110de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin{ 672800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko int i; 673800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko struct tcb *tcp; 67410de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 675800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (nprocs == tcbtabsize) 676800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko expand_tcbtab(); 677800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 678800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko for (i = 0; i < tcbtabsize; i++) { 679800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko tcp = tcbtab[i]; 680fadbf6679cb52d4265a771cbb8635a2ff472e869Denys Vlasenko if (!tcp->pid) { 681800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko memset(tcp, 0, sizeof(*tcp)); 682800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko tcp->pid = pid; 683800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko#if SUPPORTED_PERSONALITIES > 1 684800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko tcp->currpers = current_personality; 685800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko#endif 686800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko nprocs++; 687800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (debug_flag) 688800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko fprintf(stderr, "new tcb for pid %d, active tcbs:%d\n", tcp->pid, nprocs); 689800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko return tcp; 690800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } 691800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } 6923db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko error_msg_and_die("bug in alloctcb"); 69310de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin} 69410de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 695800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkostatic void 696800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkodroptcb(struct tcb *tcp) 697800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko{ 698800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (tcp->pid == 0) 699800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko return; 70010de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 701800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko nprocs--; 702800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (debug_flag) 703800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko fprintf(stderr, "dropped tcb for pid %d, %d remain\n", tcp->pid, nprocs); 70410de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 705800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (tcp->outf) { 7068511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko if (followfork >= 2) { 707800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (tcp->curcol != 0) 708800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko fprintf(tcp->outf, " <detached ...>\n"); 709800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko fclose(tcp->outf); 710800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } else { 711800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (printing_tcp == tcp && tcp->curcol != 0) 712800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko fprintf(tcp->outf, " <detached ...>\n"); 713800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko fflush(tcp->outf); 714800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } 715800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } 716800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 7176764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko if (current_tcp == tcp) 7186764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko current_tcp = NULL; 719800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (printing_tcp == tcp) 720800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko printing_tcp = NULL; 721800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 722800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko memset(tcp, 0, sizeof(*tcp)); 723800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko} 724800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 725f1669e7975cb8d67448d52d9ae7dde3301d27273Denys Vlasenko/* Detach traced process. 726800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko * Never call DETACH twice on the same process as both unattached and 727800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko * attached-unstopped processes give the same ESRCH. For unattached process we 728800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko * would SIGSTOP it and wait for its SIGSTOP notification forever. 72910de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin */ 7304a9ba989e65c12c50286a8423196236e6bac529dDenys Vlasenkostatic void 731800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkodetach(struct tcb *tcp) 73210de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin{ 733800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko int error; 734e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko int status; 73510de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 736800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (tcp->flags & TCB_BPTSET) 737800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko clearbpt(tcp); 73810de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 739800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko /* 740800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko * Linux wrongly insists the child be stopped 741800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko * before detaching. Arghh. We go through hoops 742800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko * to make a clean break of things. 743800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko */ 744800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko#if defined(SPARC) 745978fbc901c4fe260caaa5881e54bd9cb54022101Denys Vlasenko# undef PTRACE_DETACH 746978fbc901c4fe260caaa5881e54bd9cb54022101Denys Vlasenko# define PTRACE_DETACH PTRACE_SUNDETACH 747800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko#endif 74810de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 749e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko if (!(tcp->flags & TCB_ATTACHED)) 750e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko goto drop; 751e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko 752e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko /* We attached but possibly didn't see the expected SIGSTOP. 753e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * We must catch exactly one as otherwise the detached process 754e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * would be left stopped (process state T). 755e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko */ 756e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko if (tcp->flags & TCB_IGNORE_ONE_SIGSTOP) 757e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko goto wait_loop; 758e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko 759e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko error = ptrace(PTRACE_DETACH, tcp->pid, 0, 0); 760e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko if (!error) { 761e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko /* On a clear day, you can see forever. */ 762e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko goto drop; 763e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko } 764e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko if (errno != ESRCH) { 765e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko /* Shouldn't happen. */ 766e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko perror_msg("detach: ptrace(PTRACE_DETACH,%u)", tcp->pid); 767e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko goto drop; 768e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko } 769e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko /* ESRCH: process is either not stopped or doesn't exist. */ 770e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko if (my_tkill(tcp->pid, 0) < 0) { 771e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko if (errno != ESRCH) 772e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko /* Shouldn't happen. */ 773e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko perror_msg("detach: tkill(%u,0)", tcp->pid); 774e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko /* else: process doesn't exist. */ 775e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko goto drop; 776e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko } 777e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko /* Process is not stopped, need to stop it. */ 778e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko if (use_seize) { 779800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko /* 780e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * With SEIZE, tracee can be in group-stop already. 781e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * In this state sending it another SIGSTOP does nothing. 782e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * Need to use INTERRUPT. 783e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * Testcase: trying to ^C a "strace -p <stopped_process>". 784800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko */ 785e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko error = ptrace(PTRACE_INTERRUPT, tcp->pid, 0, 0); 786e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko if (!error) 787a2de9dacec47b7902b19f37edcc564faff346816Denys Vlasenko goto wait_loop; 788e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko if (errno != ESRCH) 789e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko perror_msg("detach: ptrace(PTRACE_INTERRUPT,%u)", tcp->pid); 790800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } 791e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko else { 792e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko error = my_tkill(tcp->pid, SIGSTOP); 793e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko if (!error) 794e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko goto wait_loop; 795e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko if (errno != ESRCH) 796e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko perror_msg("detach: tkill(%u,SIGSTOP)", tcp->pid); 797e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko } 798e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko /* Either process doesn't exist, or some weird error. */ 799e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko goto drop; 80010de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 801a2de9dacec47b7902b19f37edcc564faff346816Denys Vlasenko wait_loop: 802e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko /* We end up here in three cases: 803e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * 1. We sent PTRACE_INTERRUPT (use_seize case) 804e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * 2. We sent SIGSTOP (!use_seize) 805e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * 3. Attach SIGSTOP was already pending (TCB_IGNORE_ONE_SIGSTOP set) 806e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko */ 807e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko for (;;) { 808e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko int sig; 809e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko if (waitpid(tcp->pid, &status, __WALL) < 0) { 810e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko if (errno == EINTR) 811e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko continue; 812e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko /* 813e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * if (errno == ECHILD) break; 814e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * ^^^ WRONG! We expect this PID to exist, 815e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * and want to emit a message otherwise: 816e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko */ 817e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko perror_msg("detach: waitpid(%u)", tcp->pid); 818e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko break; 819e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko } 820e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko if (!WIFSTOPPED(status)) { 821e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko /* 822e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * Tracee exited or was killed by signal. 823e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * We shouldn't normally reach this place: 824e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * we don't want to consume exit status. 825e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * Consider "strace -p PID" being ^C-ed: 826e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * we want merely to detach from PID. 827e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * 828e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * However, we _can_ end up here if tracee 829e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * was SIGKILLed. 830e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko */ 831e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko break; 832e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko } 833e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko sig = WSTOPSIG(status); 834e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko if (debug_flag) 835e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko fprintf(stderr, "detach wait: event:%d sig:%d\n", 836e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko (unsigned)status >> 16, sig); 837e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko if (use_seize) { 838e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko unsigned event = (unsigned)status >> 16; 839e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko if (event == PTRACE_EVENT_STOP /*&& sig == SIGTRAP*/) { 84069e27ef24402059d1d103c83e511b62bc60310d2Denys Vlasenko /* 841e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * sig == SIGTRAP: PTRACE_INTERRUPT stop. 842e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * sig == other: process was already stopped 843e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * with this stopping sig (see tests/detach-stopped). 844e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * Looks like re-injecting this sig is not necessary 845e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * in DETACH for the tracee to remain stopped. 84669e27ef24402059d1d103c83e511b62bc60310d2Denys Vlasenko */ 847e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko sig = 0; 84869e27ef24402059d1d103c83e511b62bc60310d2Denys Vlasenko } 849e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko /* 850e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * PTRACE_INTERRUPT is not guaranteed to produce 851e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * the above event if other ptrace-stop is pending. 852e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * See tests/detach-sleeping testcase: 853e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * strace got SIGINT while tracee is sleeping. 854e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * We sent PTRACE_INTERRUPT. 855e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * We see syscall exit, not PTRACE_INTERRUPT stop. 856e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * We won't get PTRACE_INTERRUPT stop 857e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * if we would CONT now. Need to DETACH. 858e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko */ 85969e27ef24402059d1d103c83e511b62bc60310d2Denys Vlasenko if (sig == syscall_trap_sig) 86069e27ef24402059d1d103c83e511b62bc60310d2Denys Vlasenko sig = 0; 861e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko /* else: not sure in which case we can be here. 862e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * Signal stop? Inject it while detaching. 863e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko */ 864e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko ptrace_restart(PTRACE_DETACH, tcp, sig); 865e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko break; 866e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko } 867e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko /* Note: this check has to be after use_seize check */ 868e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko /* (else, in use_seize case SIGSTOP will be mistreated) */ 869e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko if (sig == SIGSTOP) { 870e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko /* Detach, suppressing SIGSTOP */ 871e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko ptrace_restart(PTRACE_DETACH, tcp, 0); 872e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko break; 873e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko } 874e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko if (sig == syscall_trap_sig) 875e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko sig = 0; 876e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko /* Can't detach just yet, may need to wait for SIGSTOP */ 877e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko error = ptrace_restart(PTRACE_CONT, tcp, sig); 878e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko if (error < 0) { 879e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko /* Should not happen. 880e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * Note: ptrace_restart returns 0 on ESRCH, so it's not it. 881e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko * ptrace_restart already emitted error message. 882e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko */ 883e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko break; 88410de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin } 88510de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin } 8867dd23384f77e9917bd3173c673f318c5d5b485acDenys Vlasenko 887e2567d54dd57438d8ebe0167748cde7b661103e8Denys Vlasenko drop: 888800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (!qflag && (tcp->flags & TCB_ATTACHED)) 889800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko fprintf(stderr, "Process %u detached\n", tcp->pid); 89010de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 891800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko droptcb(tcp); 89210de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin} 89310de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 894558e5127fb68a7ab5c5ba6d8e976efd77e396cc2Denys Vlasenkostatic void 895558e5127fb68a7ab5c5ba6d8e976efd77e396cc2Denys Vlasenkoprocess_opt_p_list(char *opt) 896e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko{ 897e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko while (*opt) { 898e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko /* 899e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko * We accept -p PID,PID; -p "`pidof PROG`"; -p "`pgrep PROG`". 900e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko * pidof uses space as delim, pgrep uses newline. :( 901e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko */ 902e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko int pid; 903e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko char *delim = opt + strcspn(opt, ", \n\t"); 904e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko char c = *delim; 905e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko 906e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko *delim = '\0'; 907ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin pid = string_to_uint(opt); 908e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko if (pid <= 0) { 909ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin error_msg_and_die("Invalid process id: '%s'", opt); 910e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko } 911e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko if (pid == strace_tracer_pid) { 912ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin error_msg_and_die("I'm sorry, I can't let you do that, Dave."); 913e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko } 914e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko *delim = c; 9153db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko alloctcb(pid); 916e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko if (c == '\0') 917e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko break; 918e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko opt = delim + 1; 919e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko } 920e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko} 921e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko 92202203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrathstatic void 92302203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrathstartup_attach(void) 92402203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath{ 92502203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath int tcbi; 92602203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath struct tcb *tcp; 92702203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath 92802203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath /* 92902203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath * Block user interruptions as we would leave the traced 93002203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath * process stopped (process state T) if we would terminate in 9312e968c0bb7b89aa43df726eb651f0b51572b4194Denys Vlasenko * between PTRACE_ATTACH and wait4() on SIGSTOP. 932b63256e69bf3f1a74aadb0e14556490bc8f4ef95Denys Vlasenko * We rely on cleanup() from this point on. 93302203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath */ 93402203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath if (interactive) 93502203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath sigprocmask(SIG_BLOCK, &blocked_set, NULL); 93602203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath 937ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko if (daemonized_tracer) { 938ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko pid_t pid = fork(); 939ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko if (pid < 0) { 940014ca3a53cb24d8e12e87f43a880efc52940a8beDenys Vlasenko perror_msg_and_die("fork"); 941ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko } 942ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko if (pid) { /* parent */ 943ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko /* 94475422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko * Wait for grandchild to attach to straced process 94575422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko * (grandparent). Grandchild SIGKILLs us after it attached. 94675422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko * Grandparent's wait() is unblocked by our death, 947ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko * it proceeds to exec the straced program. 948ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko */ 949ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko pause(); 950ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko _exit(0); /* paranoia */ 951ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko } 95275422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko /* grandchild */ 95375422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko /* We will be the tracer process. Remember our new pid: */ 95475422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko strace_tracer_pid = getpid(); 955ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko } 956ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko 95702203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath for (tcbi = 0; tcbi < tcbtabsize; tcbi++) { 95802203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath tcp = tcbtab[tcbi]; 95944f87efc676467ab47972feec49af4f7f34356bfDenys Vlasenko 960fadbf6679cb52d4265a771cbb8635a2ff472e869Denys Vlasenko if (!tcp->pid) 96175fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko continue; 96275fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko 963d116a7338645af45090aecc331701e999148d284Denys Vlasenko /* Is this a process we should attach to, but not yet attached? */ 96475fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko if (tcp->flags & TCB_ATTACHED) 96575fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko continue; /* no, we already attached it */ 966d116a7338645af45090aecc331701e999148d284Denys Vlasenko 967ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko if (followfork && !daemonized_tracer) { 9687a8bf065802f836901ae886317efcb4ed77cae7bDenys Vlasenko char procdir[sizeof("/proc/%d/task") + sizeof(int) * 3]; 96902203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath DIR *dir; 97002203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath 97102203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath sprintf(procdir, "/proc/%d/task", tcp->pid); 97202203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath dir = opendir(procdir); 97302203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath if (dir != NULL) { 97402203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath unsigned int ntid = 0, nerr = 0; 975c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin struct_dirent *de; 976381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko 977c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin while ((de = read_dir(dir)) != NULL) { 978381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko struct tcb *cur_tcp; 979381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko int tid; 980381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko 9817a8bf065802f836901ae886317efcb4ed77cae7bDenys Vlasenko if (de->d_fileno == 0) 98202203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath continue; 983ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin /* we trust /proc filesystem */ 98402203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath tid = atoi(de->d_name); 98502203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath if (tid <= 0) 98602203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath continue; 98702203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath ++ntid; 98831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (ptrace_attach_or_seize(tid) < 0) { 98902203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath ++nerr; 990a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko if (debug_flag) 991f95397afb8aadf017b2d3d42056c5929dbf16775Denys Vlasenko fprintf(stderr, "attach to pid %d failed\n", tid); 992381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko continue; 993f95397afb8aadf017b2d3d42056c5929dbf16775Denys Vlasenko } 994a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko if (debug_flag) 995381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko fprintf(stderr, "attach to pid %d succeeded\n", tid); 996381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko cur_tcp = tcp; 997381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko if (tid != tcp->pid) 998381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko cur_tcp = alloctcb(tid); 99931fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko cur_tcp->flags |= TCB_ATTACHED | TCB_STARTUP | post_attach_sigstop; 10003db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko newoutf(cur_tcp); 100102203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath } 100202203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath closedir(dir); 1003381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko if (interactive) { 1004381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko sigprocmask(SIG_SETMASK, &empty_set, NULL); 1005381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko if (interrupted) 1006381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko goto ret; 1007381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko sigprocmask(SIG_BLOCK, &blocked_set, NULL); 1008381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko } 10097a8bf065802f836901ae886317efcb4ed77cae7bDenys Vlasenko ntid -= nerr; 10107a8bf065802f836901ae886317efcb4ed77cae7bDenys Vlasenko if (ntid == 0) { 1011905e8e0e2f0a1f51ab92424dcb005885ea8b2459Denys Vlasenko perror_msg("attach: ptrace(PTRACE_ATTACH, ...)"); 101202203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath droptcb(tcp); 101302203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath continue; 101402203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath } 101502203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath if (!qflag) { 10167a8bf065802f836901ae886317efcb4ed77cae7bDenys Vlasenko fprintf(stderr, ntid > 1 10173db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko? "Process %u attached with %u threads\n" 10183db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko: "Process %u attached\n", 101944f87efc676467ab47972feec49af4f7f34356bfDenys Vlasenko tcp->pid, ntid); 102002203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath } 102175fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko if (!(tcp->flags & TCB_ATTACHED)) { 1022f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko /* -p PID, we failed to attach to PID itself 1023f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko * but did attach to some of its sibling threads. 1024f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko * Drop PID's tcp. 1025f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko */ 1026f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko droptcb(tcp); 1027f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko } 102802203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath continue; 10297a8bf065802f836901ae886317efcb4ed77cae7bDenys Vlasenko } /* if (opendir worked) */ 10307a8bf065802f836901ae886317efcb4ed77cae7bDenys Vlasenko } /* if (-f) */ 103131fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (ptrace_attach_or_seize(tcp->pid) < 0) { 1032905e8e0e2f0a1f51ab92424dcb005885ea8b2459Denys Vlasenko perror_msg("attach: ptrace(PTRACE_ATTACH, ...)"); 103302203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath droptcb(tcp); 103402203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath continue; 103502203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath } 103675fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko tcp->flags |= TCB_ATTACHED | TCB_STARTUP | post_attach_sigstop; 10373db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko newoutf(tcp); 1038a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko if (debug_flag) 1039f95397afb8aadf017b2d3d42056c5929dbf16775Denys Vlasenko fprintf(stderr, "attach to pid %d (main) succeeded\n", tcp->pid); 1040ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko 1041ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko if (daemonized_tracer) { 1042ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko /* 1043ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko * Make parent go away. 1044ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko * Also makes grandparent's wait() unblock. 1045ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko */ 1046ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko kill(getppid(), SIGKILL); 1047ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko } 1048ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko 104902203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath if (!qflag) 105002203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath fprintf(stderr, 10519c3861d3177f3bfb12b24890fd118bcb77066abbDenys Vlasenko "Process %u attached\n", 105202203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath tcp->pid); 1053f95397afb8aadf017b2d3d42056c5929dbf16775Denys Vlasenko } /* for each tcbtab[] */ 105402203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath 105544f87efc676467ab47972feec49af4f7f34356bfDenys Vlasenko ret: 105602203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath if (interactive) 105702203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath sigprocmask(SIG_SETMASK, &empty_set, NULL); 105802203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath} 105902203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath 1060f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko/* Stack-o-phobic exec helper, in the hope to work around 1061f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * NOMMU + "daemonized tracer" difficulty. 1062f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko */ 1063f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenkostruct exec_params { 1064f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko int fd_to_close; 1065f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko uid_t run_euid; 1066f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko gid_t run_egid; 1067f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko char **argv; 1068f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko char *pathname; 1069f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko}; 1070f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenkostatic struct exec_params params_for_tracee; 1071f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenkostatic void __attribute__ ((noinline, noreturn)) 1072f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenkoexec_or_die(void) 1073f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko{ 1074f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko struct exec_params *params = ¶ms_for_tracee; 1075f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko 1076f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko if (params->fd_to_close >= 0) 1077f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko close(params->fd_to_close); 1078f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko if (!daemonized_tracer && !use_seize) { 1079f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko if (ptrace(PTRACE_TRACEME, 0L, 0L, 0L) < 0) { 1080f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko perror_msg_and_die("ptrace(PTRACE_TRACEME, ...)"); 1081f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko } 1082f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko } 1083f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko 1084f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko if (username != NULL) { 1085f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko /* 1086f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * It is important to set groups before we 1087f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * lose privileges on setuid. 1088f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko */ 1089f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko if (initgroups(username, run_gid) < 0) { 1090f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko perror_msg_and_die("initgroups"); 1091f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko } 1092f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko if (setregid(run_gid, params->run_egid) < 0) { 1093f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko perror_msg_and_die("setregid"); 1094f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko } 1095f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko if (setreuid(run_uid, params->run_euid) < 0) { 1096f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko perror_msg_and_die("setreuid"); 1097f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko } 1098f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko } 1099f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko else if (geteuid() != 0) 1100f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko if (setreuid(run_uid, run_uid) < 0) { 1101f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko perror_msg_and_die("setreuid"); 1102f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko } 1103f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko 1104f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko if (!daemonized_tracer) { 1105f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko /* 1106f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * Induce a ptrace stop. Tracer (our parent) 1107f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * will resume us with PTRACE_SYSCALL and display 1108f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * the immediately following execve syscall. 1109f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * Can't do this on NOMMU systems, we are after 1110f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * vfork: parent is blocked, stopping would deadlock. 1111f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko */ 1112f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko if (!NOMMU_SYSTEM) 1113f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko kill(getpid(), SIGSTOP); 1114f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko } else { 1115f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko alarm(3); 1116f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko /* we depend on SIGCHLD set to SIG_DFL by init code */ 1117f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko /* if it happens to be SIG_IGN'ed, wait won't block */ 1118f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko wait(NULL); 1119f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko alarm(0); 1120f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko } 1121f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko 1122f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko execv(params->pathname, params->argv); 1123f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko perror_msg_and_die("exec"); 1124f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko} 1125f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko 112602203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrathstatic void 11271201426dd43f5b4e12dfe520e2a9c5027d33dc11Denys Vlasenkostartup_child(char **argv) 112802203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath{ 1129c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin struct_stat statbuf; 113002203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath const char *filename; 113102203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath char pathname[MAXPATHLEN]; 1132f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko int pid; 113302203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath struct tcb *tcp; 113402203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath 113502203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath filename = argv[0]; 113602203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath if (strchr(filename, '/')) { 113702203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath if (strlen(filename) > sizeof pathname - 1) { 113802203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath errno = ENAMETOOLONG; 1139cb2ad00652e746b370703b5470932b7612308b9cDenys Vlasenko perror_msg_and_die("exec"); 114002203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath } 114102203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath strcpy(pathname, filename); 114202203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath } 114302203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath#ifdef USE_DEBUGGING_EXEC 114402203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath /* 114502203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath * Debuggers customarily check the current directory 114602203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath * first regardless of the path but doing that gives 114702203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath * security geeks a panic attack. 114802203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath */ 1149c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin else if (stat_file(filename, &statbuf) == 0) 115002203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath strcpy(pathname, filename); 115102203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath#endif /* USE_DEBUGGING_EXEC */ 115202203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath else { 115330145dda9d7ff70df1d5ad750a183572c73e8963Dmitry V. Levin const char *path; 115402203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath int m, n, len; 115502203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath 115602203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath for (path = getenv("PATH"); path && *path; path += m) { 11574f3df078b26899afe0f25d8651b06a5a5b5143e2Denys Vlasenko const char *colon = strchr(path, ':'); 11584f3df078b26899afe0f25d8651b06a5a5b5143e2Denys Vlasenko if (colon) { 11594f3df078b26899afe0f25d8651b06a5a5b5143e2Denys Vlasenko n = colon - path; 116002203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath m = n + 1; 116102203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath } 116202203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath else 116302203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath m = n = strlen(path); 116402203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath if (n == 0) { 116502203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath if (!getcwd(pathname, MAXPATHLEN)) 116602203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath continue; 116702203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath len = strlen(pathname); 116802203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath } 116902203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath else if (n > sizeof pathname - 1) 117002203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath continue; 117102203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath else { 117202203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath strncpy(pathname, path, n); 117302203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath len = n; 117402203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath } 117502203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath if (len && pathname[len - 1] != '/') 117602203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath pathname[len++] = '/'; 117702203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath strcpy(pathname + len, filename); 1178c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin if (stat_file(pathname, &statbuf) == 0 && 117902203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath /* Accept only regular files 118002203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath with some execute bits set. 118102203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath XXX not perfect, might still fail */ 118202203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath S_ISREG(statbuf.st_mode) && 118302203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath (statbuf.st_mode & 0111)) 118402203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath break; 118502203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath } 118602203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath } 1187c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin if (stat_file(pathname, &statbuf) < 0) { 1188cb2ad00652e746b370703b5470932b7612308b9cDenys Vlasenko perror_msg_and_die("Can't stat '%s'", filename); 118902203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath } 1190f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko 1191f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko params_for_tracee.fd_to_close = (shared_log != stderr) ? fileno(shared_log) : -1; 1192f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko params_for_tracee.run_euid = (statbuf.st_mode & S_ISUID) ? statbuf.st_uid : run_uid; 1193f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko params_for_tracee.run_egid = (statbuf.st_mode & S_ISGID) ? statbuf.st_gid : run_gid; 1194f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko params_for_tracee.argv = argv; 1195f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko /* 1196f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * On NOMMU, can be safely freed only after execve in tracee. 1197f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * It's hard to know when that happens, so we just leak it. 1198f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko */ 119905f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko params_for_tracee.pathname = NOMMU_SYSTEM ? strdup(pathname) : pathname; 1200f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko 1201882478a0724c04287ac232c212312c8e094cce43Dmitry V. Levin#if defined HAVE_PRCTL && defined PR_SET_PTRACER && defined PR_SET_PTRACER_ANY 1202882478a0724c04287ac232c212312c8e094cce43Dmitry V. Levin if (daemonized_tracer) 1203882478a0724c04287ac232c212312c8e094cce43Dmitry V. Levin prctl(PR_SET_PTRACER, PR_SET_PTRACER_ANY); 1204882478a0724c04287ac232c212312c8e094cce43Dmitry V. Levin#endif 1205882478a0724c04287ac232c212312c8e094cce43Dmitry V. Levin 1206e8681c926c02dad48aca66f3aba1e33122002c36Denys Vlasenko pid = fork(); 1207ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko if (pid < 0) { 1208cb2ad00652e746b370703b5470932b7612308b9cDenys Vlasenko perror_msg_and_die("fork"); 1209ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko } 1210f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko if ((pid != 0 && daemonized_tracer) 1211f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko || (pid == 0 && !daemonized_tracer) 1212ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko ) { 1213f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko /* We are to become the tracee. Two cases: 1214f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * -D: we are parent 1215f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * not -D: we are child 1216f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko */ 1217f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko exec_or_die(); 121802203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath } 1219ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko 12202e968c0bb7b89aa43df726eb651f0b51572b4194Denys Vlasenko /* We are the tracer */ 122175422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko 12222e968c0bb7b89aa43df726eb651f0b51572b4194Denys Vlasenko if (!daemonized_tracer) { 1223e8681c926c02dad48aca66f3aba1e33122002c36Denys Vlasenko strace_child = pid; 122431fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (!use_seize) { 122531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko /* child did PTRACE_TRACEME, nothing to do in parent */ 122631fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } else { 12275c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko if (!NOMMU_SYSTEM) { 122831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko /* Wait until child stopped itself */ 122931fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko int status; 123031fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko while (waitpid(pid, &status, WSTOPPED) < 0) { 123131fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (errno == EINTR) 123231fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko continue; 123331fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko perror_msg_and_die("waitpid"); 123431fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 123531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (!WIFSTOPPED(status) || WSTOPSIG(status) != SIGSTOP) { 123675fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko kill_save_errno(pid, SIGKILL); 123731fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko perror_msg_and_die("Unexpected wait status %x", status); 123831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 123931fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 12405c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko /* Else: NOMMU case, we have no way to sync. 124131fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko * Just attach to it as soon as possible. 124231fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko * This means that we may miss a few first syscalls... 124331fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko */ 124431fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 124531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (ptrace_attach_or_seize(pid)) { 124675fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko kill_save_errno(pid, SIGKILL); 124731fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko perror_msg_and_die("Can't attach to %d", pid); 124831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 12495c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko if (!NOMMU_SYSTEM) 125031fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko kill(pid, SIGCONT); 125131fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 12522e968c0bb7b89aa43df726eb651f0b51572b4194Denys Vlasenko tcp = alloctcb(pid); 12535c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko if (!NOMMU_SYSTEM) 1254fadbf6679cb52d4265a771cbb8635a2ff472e869Denys Vlasenko tcp->flags |= TCB_ATTACHED | TCB_STARTUP | post_attach_sigstop; 1255f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko else 1256fadbf6679cb52d4265a771cbb8635a2ff472e869Denys Vlasenko tcp->flags |= TCB_ATTACHED | TCB_STARTUP; 12573db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko newoutf(tcp); 12582e968c0bb7b89aa43df726eb651f0b51572b4194Denys Vlasenko } 12592e968c0bb7b89aa43df726eb651f0b51572b4194Denys Vlasenko else { 126005f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko /* With -D, we are *child* here, IOW: different pid. Fetch it: */ 12612e968c0bb7b89aa43df726eb651f0b51572b4194Denys Vlasenko strace_tracer_pid = getpid(); 12622e968c0bb7b89aa43df726eb651f0b51572b4194Denys Vlasenko /* The tracee is our parent: */ 12632e968c0bb7b89aa43df726eb651f0b51572b4194Denys Vlasenko pid = getppid(); 1264f20250266eb5988805b03b1cc0fa74cdb6398742Denys Vlasenko alloctcb(pid); 1265f20250266eb5988805b03b1cc0fa74cdb6398742Denys Vlasenko /* attaching will be done later, by startup_attach */ 12663db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko /* note: we don't do newoutf(tcp) here either! */ 12675c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko 1268f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko /* NOMMU BUG! -D mode is active, we (child) return, 1269f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * and we will scribble over parent's stack! 1270f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * When parent later unpauses, it segfaults. 1271f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * 1272f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * We work around it 1273f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * (1) by declaring exec_or_die() NORETURN, 1274f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * hopefully compiler will just jump to it 1275f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * instead of call (won't push anything to stack), 1276f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * (2) by trying very hard in exec_or_die() 1277f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * to not use any stack, 1278f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * (3) having a really big (MAXPATHLEN) stack object 1279f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * in this function, which creates a "buffer" between 1280f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * child's and parent's stack pointers. 1281f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * This may save us if (1) and (2) failed 1282f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * and compiler decided to use stack in exec_or_die() anyway 1283f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * (happens on i386 because of stack parameter passing). 128405f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko * 128505f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko * A cleaner solution is to use makecontext + setcontext 128605f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko * to create a genuine separate stack and execute on it. 1287f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko */ 1288ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko } 128902203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath} 129002203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath 1291b13c0de058585de7d47778a8923426b89bfffbb5Wang Chao/* 1292b1467440f7c57c4ba9dc17ab9756e45c84d0adbeDmitry V. Levin * Test whether the kernel support PTRACE_O_TRACECLONE et al options. 1293b13c0de058585de7d47778a8923426b89bfffbb5Wang Chao * First fork a new child, call ptrace with PTRACE_SETOPTIONS on it, 1294b1467440f7c57c4ba9dc17ab9756e45c84d0adbeDmitry V. Levin * and then see which options are supported by the kernel. 1295b13c0de058585de7d47778a8923426b89bfffbb5Wang Chao */ 12968d4ca0c8cd81329ad730ab52b1e0653c1bbea803Denys Vlasenkostatic int 12973454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenkotest_ptrace_setoptions_followfork(void) 1298b13c0de058585de7d47778a8923426b89bfffbb5Wang Chao{ 12992fabd0eaf05379bf121c208ee7a1c129ce1f2f18Dmitry V. Levin int pid, expected_grandchild = 0, found_grandchild = 0; 13002fabd0eaf05379bf121c208ee7a1c129ce1f2f18Dmitry V. Levin const unsigned int test_options = PTRACE_O_TRACECLONE | 13012fabd0eaf05379bf121c208ee7a1c129ce1f2f18Dmitry V. Levin PTRACE_O_TRACEFORK | 13022fabd0eaf05379bf121c208ee7a1c129ce1f2f18Dmitry V. Levin PTRACE_O_TRACEVFORK; 1303b13c0de058585de7d47778a8923426b89bfffbb5Wang Chao 130405f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko /* Need fork for test. NOMMU has no forks */ 130505f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko if (NOMMU_SYSTEM) 130605f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko goto worked; /* be bold, and pretend that test succeeded */ 130705f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko 13085d64581e106f47c474707001f924ee15ef22830bDenys Vlasenko pid = fork(); 13095d64581e106f47c474707001f924ee15ef22830bDenys Vlasenko if (pid < 0) 131004f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin perror_msg_and_die("fork"); 13115d64581e106f47c474707001f924ee15ef22830bDenys Vlasenko if (pid == 0) { 131204f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin pid = getpid(); 131331fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (ptrace(PTRACE_TRACEME, 0L, 0L, 0L) < 0) 131404f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin perror_msg_and_die("%s: PTRACE_TRACEME doesn't work", 131504f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin __func__); 13164c65c44478f1591d96cda425d78451334fe1d401Denys Vlasenko kill_save_errno(pid, SIGSTOP); 131704f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (fork() < 0) 131804f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin perror_msg_and_die("fork"); 131904f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin _exit(0); 1320b13c0de058585de7d47778a8923426b89bfffbb5Wang Chao } 1321b1467440f7c57c4ba9dc17ab9756e45c84d0adbeDmitry V. Levin 1322b1467440f7c57c4ba9dc17ab9756e45c84d0adbeDmitry V. Levin while (1) { 1323b1467440f7c57c4ba9dc17ab9756e45c84d0adbeDmitry V. Levin int status, tracee_pid; 1324b1467440f7c57c4ba9dc17ab9756e45c84d0adbeDmitry V. Levin 132504f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin errno = 0; 1326b1467440f7c57c4ba9dc17ab9756e45c84d0adbeDmitry V. Levin tracee_pid = wait(&status); 132704f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (tracee_pid <= 0) { 1328b1467440f7c57c4ba9dc17ab9756e45c84d0adbeDmitry V. Levin if (errno == EINTR) 1329b1467440f7c57c4ba9dc17ab9756e45c84d0adbeDmitry V. Levin continue; 13304c65c44478f1591d96cda425d78451334fe1d401Denys Vlasenko if (errno == ECHILD) 1331b13c0de058585de7d47778a8923426b89bfffbb5Wang Chao break; 133204f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin kill_save_errno(pid, SIGKILL); 133304f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin perror_msg_and_die("%s: unexpected wait result %d", 133404f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin __func__, tracee_pid); 133504f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin } 133604f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (WIFEXITED(status)) { 133704f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (WEXITSTATUS(status)) { 133804f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (tracee_pid != pid) 133904f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin kill_save_errno(pid, SIGKILL); 134004f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin error_msg_and_die("%s: unexpected exit status %u", 134104f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin __func__, WEXITSTATUS(status)); 134204f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin } 134304f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin continue; 134404f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin } 134504f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (WIFSIGNALED(status)) { 134604f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (tracee_pid != pid) 134704f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin kill_save_errno(pid, SIGKILL); 134804f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin error_msg_and_die("%s: unexpected signal %u", 134904f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin __func__, WTERMSIG(status)); 135004f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin } 135104f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (!WIFSTOPPED(status)) { 135204f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (tracee_pid != pid) 135304f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin kill_save_errno(tracee_pid, SIGKILL); 13544c65c44478f1591d96cda425d78451334fe1d401Denys Vlasenko kill_save_errno(pid, SIGKILL); 135504f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin error_msg_and_die("%s: unexpected wait status %x", 135604f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin __func__, status); 1357b1467440f7c57c4ba9dc17ab9756e45c84d0adbeDmitry V. Levin } 1358b1467440f7c57c4ba9dc17ab9756e45c84d0adbeDmitry V. Levin if (tracee_pid != pid) { 13592fabd0eaf05379bf121c208ee7a1c129ce1f2f18Dmitry V. Levin found_grandchild = tracee_pid; 136004f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (ptrace(PTRACE_CONT, tracee_pid, 0, 0) < 0) { 136104f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin kill_save_errno(tracee_pid, SIGKILL); 136204f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin kill_save_errno(pid, SIGKILL); 136304f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin perror_msg_and_die("PTRACE_CONT doesn't work"); 136404f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin } 136504f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin continue; 1366b1467440f7c57c4ba9dc17ab9756e45c84d0adbeDmitry V. Levin } 136704f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin switch (WSTOPSIG(status)) { 136804f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin case SIGSTOP: 136904f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (ptrace(PTRACE_SETOPTIONS, pid, 0, test_options) < 0 137004f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin && errno != EINVAL && errno != EIO) 137104f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin perror_msg("PTRACE_SETOPTIONS"); 137204f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin break; 137304f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin case SIGTRAP: 137404f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (status >> 16 == PTRACE_EVENT_FORK) { 137504f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin long msg = 0; 13762fabd0eaf05379bf121c208ee7a1c129ce1f2f18Dmitry V. Levin 137704f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (ptrace(PTRACE_GETEVENTMSG, pid, 137804f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin NULL, (long) &msg) == 0) 137904f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin expected_grandchild = msg; 1380b13c0de058585de7d47778a8923426b89bfffbb5Wang Chao } 138104f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin break; 138204f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin } 138304f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (ptrace(PTRACE_SYSCALL, pid, 0, 0) < 0) { 138404f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin kill_save_errno(pid, SIGKILL); 138504f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin perror_msg_and_die("PTRACE_SYSCALL doesn't work"); 1386b13c0de058585de7d47778a8923426b89bfffbb5Wang Chao } 1387b13c0de058585de7d47778a8923426b89bfffbb5Wang Chao } 138804f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (expected_grandchild && expected_grandchild == found_grandchild) { 138905f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko worked: 1390f44cce48bbbd573cc5ae801f69f857433160b03aDenys Vlasenko ptrace_setoptions |= test_options; 1391a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko if (debug_flag) 139204f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin fprintf(stderr, "ptrace_setoptions = %#x\n", 139304f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin ptrace_setoptions); 13948d4ca0c8cd81329ad730ab52b1e0653c1bbea803Denys Vlasenko return 0; 139504f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin } 139604f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin error_msg("Test for PTRACE_O_TRACECLONE failed, " 139704f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin "giving up using this feature."); 13988d4ca0c8cd81329ad730ab52b1e0653c1bbea803Denys Vlasenko return 1; 1399b13c0de058585de7d47778a8923426b89bfffbb5Wang Chao} 14003454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko 14013454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko/* 14023454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * Test whether the kernel support PTRACE_O_TRACESYSGOOD. 14033454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * First fork a new child, call ptrace(PTRACE_SETOPTIONS) on it, 14043454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * and then see whether it will stop with (SIGTRAP | 0x80). 14053454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * 14063454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * Use of this option enables correct handling of user-generated SIGTRAPs, 14073454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * and SIGTRAPs generated by special instructions such as int3 on x86: 14083454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * _start: .globl _start 14093454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * int3 14103454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * movl $42, %ebx 14113454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * movl $1, %eax 14123454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * int $0x80 14133454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * (compile with: "gcc -nostartfiles -nostdlib -o int3 int3.S") 14143454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko */ 14158d4ca0c8cd81329ad730ab52b1e0653c1bbea803Denys Vlasenkostatic int 14163454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenkotest_ptrace_setoptions_for_all(void) 14173454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko{ 141804f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin const unsigned int test_options = PTRACE_O_TRACESYSGOOD | 141904f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin PTRACE_O_TRACEEXEC; 14203454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko int pid; 14213454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko int it_worked = 0; 14223454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko 142305f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko /* Need fork for test. NOMMU has no forks */ 14245c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko if (NOMMU_SYSTEM) 142505f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko goto worked; /* be bold, and pretend that test succeeded */ 14267ff5ed932568a8049c3ca134da374f64c3e255ceMike Frysinger 14273454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko pid = fork(); 14283454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko if (pid < 0) 142975422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko perror_msg_and_die("fork"); 14303454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko 14313454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko if (pid == 0) { 14323454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko pid = getpid(); 14333454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko if (ptrace(PTRACE_TRACEME, 0L, 0L, 0L) < 0) 143475422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko /* Note: exits with exitcode 1 */ 143504f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin perror_msg_and_die("%s: PTRACE_TRACEME doesn't work", 143604f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin __func__); 14373454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko kill(pid, SIGSTOP); 14383454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko _exit(0); /* parent should see entry into this syscall */ 14393454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko } 14403454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko 14413454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko while (1) { 14423454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko int status, tracee_pid; 14433454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko 14443454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko errno = 0; 14453454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko tracee_pid = wait(&status); 14463454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko if (tracee_pid <= 0) { 14473454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko if (errno == EINTR) 14483454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko continue; 144904f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin kill_save_errno(pid, SIGKILL); 145004f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin perror_msg_and_die("%s: unexpected wait result %d", 145104f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin __func__, tracee_pid); 145275422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko } 145375422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko if (WIFEXITED(status)) { 145475422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko if (WEXITSTATUS(status) == 0) 145575422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko break; 145604f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin error_msg_and_die("%s: unexpected exit status %u", 145704f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin __func__, WEXITSTATUS(status)); 145804f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin } 145904f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (WIFSIGNALED(status)) { 146004f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin error_msg_and_die("%s: unexpected signal %u", 146104f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin __func__, WTERMSIG(status)); 14623454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko } 14633454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko if (!WIFSTOPPED(status)) { 14643454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko kill(pid, SIGKILL); 146504f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin error_msg_and_die("%s: unexpected wait status %x", 146604f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin __func__, status); 14673454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko } 14683454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko if (WSTOPSIG(status) == SIGSTOP) { 14693454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko /* 14703454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * We don't check "options aren't accepted" error. 14713454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * If it happens, we'll never get (SIGTRAP | 0x80), 14723454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * and thus will decide to not use the option. 14733454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * IOW: the outcome of the test will be correct. 14743454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko */ 147504f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (ptrace(PTRACE_SETOPTIONS, pid, 0L, test_options) < 0 147604f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin && errno != EINVAL && errno != EIO) 147704f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin perror_msg("PTRACE_SETOPTIONS"); 14783454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko } 14793454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko if (WSTOPSIG(status) == (SIGTRAP | 0x80)) { 14803454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko it_worked = 1; 14813454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko } 14823454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko if (ptrace(PTRACE_SYSCALL, pid, 0L, 0L) < 0) { 148304f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin kill_save_errno(pid, SIGKILL); 148475422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko perror_msg_and_die("PTRACE_SYSCALL doesn't work"); 14853454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko } 14863454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko } 14873454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko 14883454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko if (it_worked) { 148905f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko worked: 149075422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko syscall_trap_sig = (SIGTRAP | 0x80); 1491f44cce48bbbd573cc5ae801f69f857433160b03aDenys Vlasenko ptrace_setoptions |= test_options; 1492a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko if (debug_flag) 1493f44cce48bbbd573cc5ae801f69f857433160b03aDenys Vlasenko fprintf(stderr, "ptrace_setoptions = %#x\n", 1494f44cce48bbbd573cc5ae801f69f857433160b03aDenys Vlasenko ptrace_setoptions); 14958d4ca0c8cd81329ad730ab52b1e0653c1bbea803Denys Vlasenko return 0; 14963454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko } 14973454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko 149804f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin error_msg("Test for PTRACE_O_TRACESYSGOOD failed, " 149904f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin "giving up using this feature."); 15008d4ca0c8cd81329ad730ab52b1e0653c1bbea803Denys Vlasenko return 1; 15013454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko} 150231fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 15035c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko#if USE_SEIZE 150431fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenkostatic void 150531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenkotest_ptrace_seize(void) 150631fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko{ 150731fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko int pid; 150831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 150905f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko /* Need fork for test. NOMMU has no forks */ 15105c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko if (NOMMU_SYSTEM) { 15115c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko post_attach_sigstop = 0; /* this sets use_seize to 1 */ 15125c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko return; 15135c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko } 15145c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko 151531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko pid = fork(); 151631fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (pid < 0) 151731fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko perror_msg_and_die("fork"); 151831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 151931fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (pid == 0) { 152031fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko pause(); 152131fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko _exit(0); 152231fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 152331fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 152431fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko /* PTRACE_SEIZE, unlike ATTACH, doesn't force tracee to trap. After 152531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko * attaching tracee continues to run unless a trap condition occurs. 152631fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko * PTRACE_SEIZE doesn't affect signal or group stop state. 152731fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko */ 152826bc0606d96d05d30ba263939a0451889340a64cDenys Vlasenko if (ptrace(PTRACE_SEIZE, pid, 0, 0) == 0) { 152931fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko post_attach_sigstop = 0; /* this sets use_seize to 1 */ 1530a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko } else if (debug_flag) { 153131fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko fprintf(stderr, "PTRACE_SEIZE doesn't work\n"); 153231fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 153331fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 153431fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko kill(pid, SIGKILL); 153531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 153631fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko while (1) { 153731fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko int status, tracee_pid; 153831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 153931fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko errno = 0; 154031fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko tracee_pid = waitpid(pid, &status, 0); 154131fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (tracee_pid <= 0) { 154231fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (errno == EINTR) 154331fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko continue; 154431fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko perror_msg_and_die("%s: unexpected wait result %d", 154531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko __func__, tracee_pid); 154631fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 154731fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (WIFSIGNALED(status)) { 154831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko return; 154931fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 155031fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko error_msg_and_die("%s: unexpected wait status %x", 155131fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko __func__, status); 155231fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 155331fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko} 1554978fbc901c4fe260caaa5881e54bd9cb54022101Denys Vlasenko#else /* !USE_SEIZE */ 1555978fbc901c4fe260caaa5881e54bd9cb54022101Denys Vlasenko# define test_ptrace_seize() ((void)0) 1556978fbc901c4fe260caaa5881e54bd9cb54022101Denys Vlasenko#endif 155731fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 15586e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenkostatic unsigned 1559f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenkoget_os_release(void) 1560f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko{ 15616e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko unsigned rel; 15626e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko const char *p; 1563f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko struct utsname u; 1564f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko if (uname(&u) < 0) 1565f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko perror_msg_and_die("uname"); 15666e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko /* u.release has this form: "3.2.9[-some-garbage]" */ 15676e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko rel = 0; 15686e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko p = u.release; 15696e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko for (;;) { 15706e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko if (!(*p >= '0' && *p <= '9')) 15716e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko error_msg_and_die("Bad OS release string: '%s'", u.release); 15726e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko /* Note: this open-codes KERNEL_VERSION(): */ 15736e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko rel = (rel << 8) | atoi(p); 15746e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko if (rel >= KERNEL_VERSION(1,0,0)) 15756e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko break; 15766e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko while (*p >= '0' && *p <= '9') 15776e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko p++; 15780dbc80de895c25769791b7726022a274695eec31Dmitry V. Levin if (*p != '.') { 15790dbc80de895c25769791b7726022a274695eec31Dmitry V. Levin if (rel >= KERNEL_VERSION(0,1,0)) { 15800dbc80de895c25769791b7726022a274695eec31Dmitry V. Levin /* "X.Y-something" means "X.Y.0" */ 15810dbc80de895c25769791b7726022a274695eec31Dmitry V. Levin rel <<= 8; 15820dbc80de895c25769791b7726022a274695eec31Dmitry V. Levin break; 15830dbc80de895c25769791b7726022a274695eec31Dmitry V. Levin } 15846e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko error_msg_and_die("Bad OS release string: '%s'", u.release); 15850dbc80de895c25769791b7726022a274695eec31Dmitry V. Levin } 15866e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko p++; 15876e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko } 15886e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko return rel; 1589f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko} 1590f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko 1591ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko/* 1592ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko * Initialization part of main() was eating much stack (~0.5k), 1593ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko * which was unused after init. 1594ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko * We can reuse it if we move init code into a separate function. 1595ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko * 1596ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko * Don't want main() to inline us and defeat the reason 1597ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko * we have a separate function. 1598ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko */ 1599ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenkostatic void __attribute__ ((noinline)) 1600ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenkoinit(int argc, char *argv[]) 160176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman{ 160276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman struct tcb *tcp; 1603ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin int c, i; 160406350dba7505eda4b8220cca8a9b112504fafc4dDmitry V. Levin int optF = 0; 160576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman struct sigaction sa; 160676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 160708b623eb84266d4a2defc619fa78400c4e4f0dc1Dmitry V. Levin progname = argv[0] ? argv[0] : "strace"; 160808b623eb84266d4a2defc619fa78400c4e4f0dc1Dmitry V. Levin 1609a509054aeee00a89a2250919f74bd849c67ded61Denys Vlasenko /* Make sure SIGCHLD has the default action so that waitpid 1610a509054aeee00a89a2250919f74bd849c67ded61Denys Vlasenko definitely works without losing track of children. The user 1611a509054aeee00a89a2250919f74bd849c67ded61Denys Vlasenko should not have given us a bogus state to inherit, but he might 1612a509054aeee00a89a2250919f74bd849c67ded61Denys Vlasenko have. Arguably we should detect SIG_IGN here and pass it on 1613a509054aeee00a89a2250919f74bd849c67ded61Denys Vlasenko to children, but probably noone really needs that. */ 1614a509054aeee00a89a2250919f74bd849c67ded61Denys Vlasenko signal(SIGCHLD, SIG_DFL); 1615a509054aeee00a89a2250919f74bd849c67ded61Denys Vlasenko 161675422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko strace_tracer_pid = getpid(); 161775422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko 16186e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko os_release = get_os_release(); 1619f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko 1620ee9d435275fd7abf736992f84b5053ee16ec4fc7Roland McGrath /* Allocate the initial tcbtab. */ 1621ee9d435275fd7abf736992f84b5053ee16ec4fc7Roland McGrath tcbtabsize = argc; /* Surely enough for all -p args. */ 16224f12af24e4c1d4e44b84ba6d5e72e6d8b6490e35Denys Vlasenko tcbtab = calloc(tcbtabsize, sizeof(tcbtab[0])); 16231d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko if (!tcbtab) 16241d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko die_out_of_memory(); 16254f12af24e4c1d4e44b84ba6d5e72e6d8b6490e35Denys Vlasenko tcp = calloc(tcbtabsize, sizeof(*tcp)); 16261d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko if (!tcp) 16271d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko die_out_of_memory(); 16284f12af24e4c1d4e44b84ba6d5e72e6d8b6490e35Denys Vlasenko for (c = 0; c < tcbtabsize; c++) 16294f12af24e4c1d4e44b84ba6d5e72e6d8b6490e35Denys Vlasenko tcbtab[c] = tcp++; 1630ee9d435275fd7abf736992f84b5053ee16ec4fc7Roland McGrath 16316764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko shared_log = stderr; 1632138c6a334fd9949d6147c63ada02cf55472e02c0Roland McGrath set_sortby(DEFAULT_SORTBY); 1633138c6a334fd9949d6147c63ada02cf55472e02c0Roland McGrath set_personality(DEFAULT_PERSONALITY); 163476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman qualify("trace=all"); 163576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman qualify("abbrev=all"); 163676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman qualify("verbose=all"); 163774ec14f968a418691b851cbbfeb0269174c64b08Denys Vlasenko#if DEFAULT_QUAL_FLAGS != (QUAL_TRACE | QUAL_ABBREV | QUAL_VERBOSE) 163874ec14f968a418691b851cbbfeb0269174c64b08Denys Vlasenko# error Bug in DEFAULT_QUAL_FLAGS 163974ec14f968a418691b851cbbfeb0269174c64b08Denys Vlasenko#endif 164076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman qualify("signal=all"); 164176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman while ((c = getopt(argc, argv, 164222efaf0028ddec8f9ed2a2a11e9baaa201594a33Denys Vlasenko "+b:cCdfFhiqrtTvVxyz" 1643ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko "D" 1644b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko "a:e:o:O:p:s:S:u:E:P:I:")) != EOF) { 164576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman switch (c) { 164661e7aad9fa1a6a5bd5a586e6276767caf12b53f2Denys Vlasenko case 'b': 164722efaf0028ddec8f9ed2a2a11e9baaa201594a33Denys Vlasenko if (strcmp(optarg, "execve") != 0) 164822efaf0028ddec8f9ed2a2a11e9baaa201594a33Denys Vlasenko error_msg_and_die("Syscall '%s' for -b isn't supported", 164922efaf0028ddec8f9ed2a2a11e9baaa201594a33Denys Vlasenko optarg); 165061e7aad9fa1a6a5bd5a586e6276767caf12b53f2Denys Vlasenko detach_on_execve = 1; 165161e7aad9fa1a6a5bd5a586e6276767caf12b53f2Denys Vlasenko break; 165276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'c': 1653e3a7ef5a2a3ac31bfa0d3f9ce65981e51700073eDmitry V. Levin if (cflag == CFLAG_BOTH) { 1654c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko error_msg_and_die("-c and -C are mutually exclusive"); 1655e3a7ef5a2a3ac31bfa0d3f9ce65981e51700073eDmitry V. Levin } 1656e3a7ef5a2a3ac31bfa0d3f9ce65981e51700073eDmitry V. Levin cflag = CFLAG_ONLY_STATS; 1657e3a7ef5a2a3ac31bfa0d3f9ce65981e51700073eDmitry V. Levin break; 1658e3a7ef5a2a3ac31bfa0d3f9ce65981e51700073eDmitry V. Levin case 'C': 1659e3a7ef5a2a3ac31bfa0d3f9ce65981e51700073eDmitry V. Levin if (cflag == CFLAG_ONLY_STATS) { 1660c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko error_msg_and_die("-c and -C are mutually exclusive"); 1661e3a7ef5a2a3ac31bfa0d3f9ce65981e51700073eDmitry V. Levin } 1662e3a7ef5a2a3ac31bfa0d3f9ce65981e51700073eDmitry V. Levin cflag = CFLAG_BOTH; 166376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 166476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'd': 1665a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko debug_flag = 1; 166676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 1667ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko case 'D': 1668ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko daemonized_tracer = 1; 1669ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko break; 167041c48227a86a176da333f713d5047240885f25ccRoland McGrath case 'F': 167106350dba7505eda4b8220cca8a9b112504fafc4dDmitry V. Levin optF = 1; 167206350dba7505eda4b8220cca8a9b112504fafc4dDmitry V. Levin break; 167376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'f': 167476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman followfork++; 167576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 167676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'h': 167776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman usage(stdout, 0); 167876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 167976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'i': 1680a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko iflag = 1; 168176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 168276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'q': 168301997cf32d4492b9898283ced45e8a4a6fd161b8Daniel P. Berrange qflag++; 168476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 168576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'r': 1686a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko rflag = 1; 1687a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko /* fall through to tflag++ */ 168876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 't': 168976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman tflag++; 169076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 169176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'T': 1692a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko Tflag = 1; 169376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 169476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'x': 169576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman xflag++; 169676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 16978a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards case 'y': 16988a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards show_fd_path = 1; 16998a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards break; 170076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'v': 170176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman qualify("abbrev=none"); 170276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 170376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'V': 17049c9a2534e361b683f1e4e08804b7166a01475bf1Roland McGrath printf("%s -- version %s\n", PACKAGE_NAME, VERSION); 170576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman exit(0); 170676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 170717f8fb3484e94976882f65b7a3aaffc6f24cd75dMichal Ludvig case 'z': 170817f8fb3484e94976882f65b7a3aaffc6f24cd75dMichal Ludvig not_failing_only = 1; 170917f8fb3484e94976882f65b7a3aaffc6f24cd75dMichal Ludvig break; 171076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'a': 1711ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin acolumn = string_to_uint(optarg); 1712102ec4935440ff52a7fa3566154a84cc2473f16aDenys Vlasenko if (acolumn < 0) 1713ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin error_opt_arg(c, optarg); 171476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 171576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'e': 171676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman qualify(optarg); 171776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 171876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'o': 171976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman outfname = strdup(optarg); 172076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 172176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'O': 1722ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin i = string_to_uint(optarg); 1723ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin if (i < 0) 1724ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin error_opt_arg(c, optarg); 1725ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin set_overhead(i); 172676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 172776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'p': 1728e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko process_opt_p_list(optarg); 172976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 17308a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards case 'P': 17317239dbcf2dff792f408c60fe3e278f707fdf497bDenys Vlasenko pathtrace_select(optarg); 17328a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards break; 173376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 's': 1734ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin i = string_to_uint(optarg); 1735ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin if (i < 0) 1736ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin error_opt_arg(c, optarg); 1737ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin max_strlen = i; 173876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 173976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'S': 174076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman set_sortby(optarg); 174176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 174276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'u': 174376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman username = strdup(optarg); 174476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 1745de6e53308ca58da7d357f8114afc74fff7a18043Roland McGrath case 'E': 17461d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko if (putenv(optarg) < 0) 17471d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko die_out_of_memory(); 1748de6e53308ca58da7d357f8114afc74fff7a18043Roland McGrath break; 1749b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko case 'I': 1750ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin opt_intr = string_to_uint(optarg); 1751ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin if (opt_intr <= 0 || opt_intr >= NUM_INTR_OPTS) 1752ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin error_opt_arg(c, optarg); 1753b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko break; 175476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman default: 175576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman usage(stderr, 1); 175676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 175776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 175876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 1759837399af4ffefec55f9693022dc6d8608da442cfDenys Vlasenko argv += optind; 1760837399af4ffefec55f9693022dc6d8608da442cfDenys Vlasenko /* argc -= optind; - no need, argc is not used below */ 176176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 1762102ec4935440ff52a7fa3566154a84cc2473f16aDenys Vlasenko acolumn_spaces = malloc(acolumn + 1); 1763102ec4935440ff52a7fa3566154a84cc2473f16aDenys Vlasenko if (!acolumn_spaces) 17641d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko die_out_of_memory(); 1765102ec4935440ff52a7fa3566154a84cc2473f16aDenys Vlasenko memset(acolumn_spaces, ' ', acolumn); 1766102ec4935440ff52a7fa3566154a84cc2473f16aDenys Vlasenko acolumn_spaces[acolumn] = '\0'; 1767102ec4935440ff52a7fa3566154a84cc2473f16aDenys Vlasenko 1768837399af4ffefec55f9693022dc6d8608da442cfDenys Vlasenko /* Must have PROG [ARGS], or -p PID. Not both. */ 1769fd883380671693a4616881a9103491f9e67fc8aeDenys Vlasenko if (!argv[0] == !nprocs) 1770ce0d15442eec017b1dcbfdd14ac92e73c39c586aRoland McGrath usage(stderr, 1); 1771ce0d15442eec017b1dcbfdd14ac92e73c39c586aRoland McGrath 1772fd883380671693a4616881a9103491f9e67fc8aeDenys Vlasenko if (nprocs != 0 && daemonized_tracer) { 1773c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko error_msg_and_die("-D and -p are mutually exclusive"); 1774d322a4bbe118642c4c9b170451a601a1e80b72d6Wang Chao } 1775d322a4bbe118642c4c9b170451a601a1e80b72d6Wang Chao 177606350dba7505eda4b8220cca8a9b112504fafc4dDmitry V. Levin if (!followfork) 177706350dba7505eda4b8220cca8a9b112504fafc4dDmitry V. Levin followfork = optF; 177806350dba7505eda4b8220cca8a9b112504fafc4dDmitry V. Levin 17793db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko if (followfork >= 2 && cflag) { 1780c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko error_msg_and_die("(-c or -C) and -ff are mutually exclusive"); 1781cb9def6975f28933ada9d35f05c6fba9ab3fe1fdRoland McGrath } 1782cb9def6975f28933ada9d35f05c6fba9ab3fe1fdRoland McGrath 178376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman /* See if they want to run as another user. */ 178476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman if (username != NULL) { 178576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman struct passwd *pent; 178676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 178776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman if (getuid() != 0 || geteuid() != 0) { 1788cb2ad00652e746b370703b5470932b7612308b9cDenys Vlasenko error_msg_and_die("You must be root to use the -u option"); 178976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 17905d64581e106f47c474707001f924ee15ef22830bDenys Vlasenko pent = getpwnam(username); 17915d64581e106f47c474707001f924ee15ef22830bDenys Vlasenko if (pent == NULL) { 1792cb2ad00652e746b370703b5470932b7612308b9cDenys Vlasenko error_msg_and_die("Cannot find user '%s'", username); 179376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 179476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman run_uid = pent->pw_uid; 179576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman run_gid = pent->pw_gid; 179676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 179776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman else { 179876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman run_uid = getuid(); 179976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman run_gid = getgid(); 180076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 180176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 18028d4ca0c8cd81329ad730ab52b1e0653c1bbea803Denys Vlasenko /* 18038d4ca0c8cd81329ad730ab52b1e0653c1bbea803Denys Vlasenko * On any reasonably recent Linux kernel (circa about 2.5.46) 18048d4ca0c8cd81329ad730ab52b1e0653c1bbea803Denys Vlasenko * need_fork_exec_workarounds should stay 0 after these tests: 18058d4ca0c8cd81329ad730ab52b1e0653c1bbea803Denys Vlasenko */ 18068d4ca0c8cd81329ad730ab52b1e0653c1bbea803Denys Vlasenko /*need_fork_exec_workarounds = 0; - already is */ 180704f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (followfork) 18088d4ca0c8cd81329ad730ab52b1e0653c1bbea803Denys Vlasenko need_fork_exec_workarounds = test_ptrace_setoptions_followfork(); 18098d4ca0c8cd81329ad730ab52b1e0653c1bbea803Denys Vlasenko need_fork_exec_workarounds |= test_ptrace_setoptions_for_all(); 181031fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko test_ptrace_seize(); 18118044bc1463f62ae5f974cc531576bc18dade0337Dmitry V. Levin 181276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman /* Check if they want to redirect the output. */ 181376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman if (outfname) { 181437b9a66dd4cf063c4a3d1002f4196cd7ef9ae5b7Roland McGrath /* See if they want to pipe the output. */ 181537b9a66dd4cf063c4a3d1002f4196cd7ef9ae5b7Roland McGrath if (outfname[0] == '|' || outfname[0] == '!') { 181637b9a66dd4cf063c4a3d1002f4196cd7ef9ae5b7Roland McGrath /* 181737b9a66dd4cf063c4a3d1002f4196cd7ef9ae5b7Roland McGrath * We can't do the <outfname>.PID funny business 181837b9a66dd4cf063c4a3d1002f4196cd7ef9ae5b7Roland McGrath * when using popen, so prohibit it. 181937b9a66dd4cf063c4a3d1002f4196cd7ef9ae5b7Roland McGrath */ 18203db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko if (followfork >= 2) 18217dd23384f77e9917bd3173c673f318c5d5b485acDenys Vlasenko error_msg_and_die("Piping the output and -ff are mutually exclusive"); 18226764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko shared_log = strace_popen(outfname + 1); 182354b4f79216c819ec93aaf5031acb1772fccef7a9Wichert Akkerman } 18243db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko else if (followfork < 2) 18256764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko shared_log = strace_fopen(outfname); 1826328bf250bde8167cec6f2f5bf35463fb4ffb6f9fDenys Vlasenko } else { 1827328bf250bde8167cec6f2f5bf35463fb4ffb6f9fDenys Vlasenko /* -ff without -o FILE is the same as single -f */ 18283db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko if (followfork >= 2) 1829328bf250bde8167cec6f2f5bf35463fb4ffb6f9fDenys Vlasenko followfork = 1; 183076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 183176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 1832cb2ad00652e746b370703b5470932b7612308b9cDenys Vlasenko if (!outfname || outfname[0] == '|' || outfname[0] == '!') { 1833a677da5e3f25107d4402c1c917d019f2d0bc9f29Denys Vlasenko char *buf = malloc(BUFSIZ); 1834a677da5e3f25107d4402c1c917d019f2d0bc9f29Denys Vlasenko if (!buf) 1835a677da5e3f25107d4402c1c917d019f2d0bc9f29Denys Vlasenko die_out_of_memory(); 18366764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko setvbuf(shared_log, buf, _IOLBF, BUFSIZ); 1837cb2ad00652e746b370703b5470932b7612308b9cDenys Vlasenko } 1838837399af4ffefec55f9693022dc6d8608da442cfDenys Vlasenko if (outfname && argv[0]) { 1839b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko if (!opt_intr) 1840b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko opt_intr = INTR_NEVER; 184176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman qflag = 1; 1842369310502bfca4b202d72be9452c8cdb55bb6d5eRoland McGrath } 1843b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko if (!opt_intr) 1844b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko opt_intr = INTR_WHILE_WAIT; 1845b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko 1846b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko /* argv[0] -pPID -oFILE Default interactive setting 1847b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko * yes 0 0 INTR_WHILE_WAIT 1848b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko * no 1 0 INTR_WHILE_WAIT 1849b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko * yes 0 1 INTR_NEVER 1850b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko * no 1 1 INTR_WHILE_WAIT 185154cc1c8ae2d097502439a95d43e1f0ed6782d38cRoland McGrath */ 185254cc1c8ae2d097502439a95d43e1f0ed6782d38cRoland McGrath 18535c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko sigemptyset(&empty_set); 18545c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko sigemptyset(&blocked_set); 18555c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko 1856f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko /* startup_child() must be called before the signal handlers get 1857f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * installed below as they are inherited into the spawned process. 1858f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * Also we do not need to be protected by them as during interruption 1859f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * in the startup_child() mode we kill the spawned process anyway. 1860f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko */ 186161e7aad9fa1a6a5bd5a586e6276767caf12b53f2Denys Vlasenko if (argv[0]) { 18621d2435b20bc81fb52c3edb19a3b6247ce2d43ca6Dmitry V. Levin if (!NOMMU_SYSTEM || daemonized_tracer) 18631d2435b20bc81fb52c3edb19a3b6247ce2d43ca6Dmitry V. Levin hide_log_until_execve = 1; 18642a3d27552f17a5b378344620bec7d255bac65a8dDenys Vlasenko skip_one_b_execve = 1; 1865837399af4ffefec55f9693022dc6d8608da442cfDenys Vlasenko startup_child(argv); 186661e7aad9fa1a6a5bd5a586e6276767caf12b53f2Denys Vlasenko } 186776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 186876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman sa.sa_handler = SIG_IGN; 186976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman sigemptyset(&sa.sa_mask); 187076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman sa.sa_flags = 0; 1871b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sigaction(SIGTTOU, &sa, NULL); /* SIG_IGN */ 1872b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sigaction(SIGTTIN, &sa, NULL); /* SIG_IGN */ 1873b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko if (opt_intr != INTR_ANYWHERE) { 1874b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko if (opt_intr == INTR_BLOCK_TSTP_TOO) 1875b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sigaction(SIGTSTP, &sa, NULL); /* SIG_IGN */ 1876b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko /* 1877b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko * In interactive mode (if no -o OUTFILE, or -p PID is used), 1878b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko * fatal signals are blocked while syscall stop is processed, 1879b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko * and acted on in between, when waiting for new syscall stops. 1880b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko * In non-interactive mode, signals are ignored. 1881b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko */ 1882b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko if (opt_intr == INTR_WHILE_WAIT) { 1883b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sigaddset(&blocked_set, SIGHUP); 1884b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sigaddset(&blocked_set, SIGINT); 1885b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sigaddset(&blocked_set, SIGQUIT); 1886b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sigaddset(&blocked_set, SIGPIPE); 1887b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sigaddset(&blocked_set, SIGTERM); 1888b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sa.sa_handler = interrupt; 1889b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko } 1890b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko /* SIG_IGN, or set handler for these */ 1891b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sigaction(SIGHUP, &sa, NULL); 1892b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sigaction(SIGINT, &sa, NULL); 1893b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sigaction(SIGQUIT, &sa, NULL); 1894b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sigaction(SIGPIPE, &sa, NULL); 1895b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sigaction(SIGTERM, &sa, NULL); 189676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 1897fd883380671693a4616881a9103491f9e67fc8aeDenys Vlasenko if (nprocs != 0 || daemonized_tracer) 189802203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath startup_attach(); 189902203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath 1900fd883380671693a4616881a9103491f9e67fc8aeDenys Vlasenko /* Do we want pids printed in our -o OUTFILE? 1901fd883380671693a4616881a9103491f9e67fc8aeDenys Vlasenko * -ff: no (every pid has its own file); or 1902fd883380671693a4616881a9103491f9e67fc8aeDenys Vlasenko * -f: yes (there can be more pids in the future); or 1903fd883380671693a4616881a9103491f9e67fc8aeDenys Vlasenko * -p PID1,PID2: yes (there are already more than one pid) 1904fd883380671693a4616881a9103491f9e67fc8aeDenys Vlasenko */ 1905fd883380671693a4616881a9103491f9e67fc8aeDenys Vlasenko print_pid_pfx = (outfname && followfork < 2 && (followfork == 1 || nprocs > 1)); 190676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman} 190776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 1908eebb04d4ae8bf4b08a041f5ea442ca24c90692c2Denys Vlasenkostatic struct tcb * 190954e931fb858410644f61885b4b36fc20320e1fc6Roland McGrathpid2tcb(int pid) 191076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman{ 191176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman int i; 191254e931fb858410644f61885b4b36fc20320e1fc6Roland McGrath 191354e931fb858410644f61885b4b36fc20320e1fc6Roland McGrath if (pid <= 0) 191454e931fb858410644f61885b4b36fc20320e1fc6Roland McGrath return NULL; 191576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 1916ee9d435275fd7abf736992f84b5053ee16ec4fc7Roland McGrath for (i = 0; i < tcbtabsize; i++) { 191754e931fb858410644f61885b4b36fc20320e1fc6Roland McGrath struct tcb *tcp = tcbtab[i]; 1918fadbf6679cb52d4265a771cbb8635a2ff472e869Denys Vlasenko if (tcp->pid == pid) 191976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman return tcp; 192076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 192154e931fb858410644f61885b4b36fc20320e1fc6Roland McGrath 192276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman return NULL; 192376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman} 192476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 192576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkermanstatic void 19261201426dd43f5b4e12dfe520e2a9c5027d33dc11Denys Vlasenkocleanup(void) 192776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman{ 192876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman int i; 192976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman struct tcb *tcp; 19303521884c91d0bbd8e796d72619da40bdad95789cDenys Vlasenko int fatal_sig; 19313521884c91d0bbd8e796d72619da40bdad95789cDenys Vlasenko 19323521884c91d0bbd8e796d72619da40bdad95789cDenys Vlasenko /* 'interrupted' is a volatile object, fetch it only once */ 19333521884c91d0bbd8e796d72619da40bdad95789cDenys Vlasenko fatal_sig = interrupted; 19343521884c91d0bbd8e796d72619da40bdad95789cDenys Vlasenko if (!fatal_sig) 19353521884c91d0bbd8e796d72619da40bdad95789cDenys Vlasenko fatal_sig = SIGTERM; 193676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 1937ee9d435275fd7abf736992f84b5053ee16ec4fc7Roland McGrath for (i = 0; i < tcbtabsize; i++) { 1938ee9d435275fd7abf736992f84b5053ee16ec4fc7Roland McGrath tcp = tcbtab[i]; 1939fadbf6679cb52d4265a771cbb8635a2ff472e869Denys Vlasenko if (!tcp->pid) 194076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman continue; 1941a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko if (debug_flag) 194276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman fprintf(stderr, 194376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman "cleanup: looking at pid %u\n", tcp->pid); 1944fadbf6679cb52d4265a771cbb8635a2ff472e869Denys Vlasenko if (tcp->pid == strace_child) { 194576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman kill(tcp->pid, SIGCONT); 1946a3559250d48ccc3ef755183ebb3246cbbb442c0dDenys Vlasenko kill(tcp->pid, fatal_sig); 194776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 19487de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko detach(tcp); 194976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 195076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman if (cflag) 19516764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko call_summary(shared_log); 195276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman} 195376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 195476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkermanstatic void 19551201426dd43f5b4e12dfe520e2a9c5027d33dc11Denys Vlasenkointerrupt(int sig) 195676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman{ 1957a3559250d48ccc3ef755183ebb3246cbbb442c0dDenys Vlasenko interrupted = sig; 195876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman} 195976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 1960d0ffdf494ac722f3d121c6e807f105000409e6a6Denys Vlasenkostatic void 19611201426dd43f5b4e12dfe520e2a9c5027d33dc11Denys Vlasenkotrace(void) 196276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman{ 196376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman struct rusage ru; 196476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 1965eb9e2e8904ce85a6c7390be25bb873c6db88c4d3Roland McGrath while (nprocs != 0) { 1966f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko int pid; 1967f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko int wait_errno; 1968f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko int status, sig; 196931fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko int stopped; 1970f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko struct tcb *tcp; 1971f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko unsigned event; 1972f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko 1973222713aa409c5caa47327a084f1083a7d6fee66fDenys Vlasenko if (interrupted) 1974d0ffdf494ac722f3d121c6e807f105000409e6a6Denys Vlasenko return; 1975725dd425a60af0cd0fa7bb764ae3a122269a70fcDenys Vlasenko 1976eb9e2e8904ce85a6c7390be25bb873c6db88c4d3Roland McGrath if (interactive) 1977eb9e2e8904ce85a6c7390be25bb873c6db88c4d3Roland McGrath sigprocmask(SIG_SETMASK, &empty_set, NULL); 1978725dd425a60af0cd0fa7bb764ae3a122269a70fcDenys Vlasenko pid = wait4(-1, &status, __WALL, (cflag ? &ru : NULL)); 197976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman wait_errno = errno; 1980eb9e2e8904ce85a6c7390be25bb873c6db88c4d3Roland McGrath if (interactive) 1981eb9e2e8904ce85a6c7390be25bb873c6db88c4d3Roland McGrath sigprocmask(SIG_BLOCK, &blocked_set, NULL); 198276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 198326d1b1eaa861ec33d2c671acc9c0ccb867042cb8Denys Vlasenko if (pid < 0) { 1984725dd425a60af0cd0fa7bb764ae3a122269a70fcDenys Vlasenko if (wait_errno == EINTR) 198576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman continue; 1986725dd425a60af0cd0fa7bb764ae3a122269a70fcDenys Vlasenko if (wait_errno == ECHILD) 1987725dd425a60af0cd0fa7bb764ae3a122269a70fcDenys Vlasenko /* Should not happen since nprocs > 0 */ 1988d0ffdf494ac722f3d121c6e807f105000409e6a6Denys Vlasenko return; 1989725dd425a60af0cd0fa7bb764ae3a122269a70fcDenys Vlasenko errno = wait_errno; 1990d0ffdf494ac722f3d121c6e807f105000409e6a6Denys Vlasenko perror_msg_and_die("wait4(__WALL)"); 199176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 1992725dd425a60af0cd0fa7bb764ae3a122269a70fcDenys Vlasenko 199310de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin if (pid == popen_pid) { 1994c8511f07aba78178f8528e22a8daa438347eb4faDenys Vlasenko if (!WIFSTOPPED(status)) 19957dd23384f77e9917bd3173c673f318c5d5b485acDenys Vlasenko popen_pid = 0; 199610de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin continue; 199710de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin } 1998f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko 1999f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko event = ((unsigned)status >> 16); 2000a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko if (debug_flag) { 20011d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko char buf[sizeof("WIFEXITED,exitcode=%u") + sizeof(int)*3 /*paranoia:*/ + 16]; 20021b2bfbc8257231c18dcdd30b8a84eadffbe9417aDenys Vlasenko char evbuf[sizeof(",EVENT_VFORK_DONE (%u)") + sizeof(int)*3 /*paranoia:*/ + 16]; 20031d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko strcpy(buf, "???"); 20041d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko if (WIFSIGNALED(status)) 20051d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko#ifdef WCOREDUMP 20061d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko sprintf(buf, "WIFSIGNALED,%ssig=%s", 20071d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko WCOREDUMP(status) ? "core," : "", 20081d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko signame(WTERMSIG(status))); 20091d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko#else 20101d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko sprintf(buf, "WIFSIGNALED,sig=%s", 20111d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko signame(WTERMSIG(status))); 20121d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko#endif 20131d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko if (WIFEXITED(status)) 20141d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko sprintf(buf, "WIFEXITED,exitcode=%u", WEXITSTATUS(status)); 20151d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko if (WIFSTOPPED(status)) 20161d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko sprintf(buf, "WIFSTOPPED,sig=%s", signame(WSTOPSIG(status))); 20175bd67c86a93c658d258348e8f14af94fd45cbeb6Denys Vlasenko#ifdef WIFCONTINUED 2018c8511f07aba78178f8528e22a8daa438347eb4faDenys Vlasenko /* Should never be seen */ 20191d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko if (WIFCONTINUED(status)) 20201d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko strcpy(buf, "WIFCONTINUED"); 20215bd67c86a93c658d258348e8f14af94fd45cbeb6Denys Vlasenko#endif 202267559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko evbuf[0] = '\0'; 202367559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko if (event != 0) { 202467559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko static const char *const event_names[] = { 202567559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko [PTRACE_EVENT_CLONE] = "CLONE", 202667559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko [PTRACE_EVENT_FORK] = "FORK", 202767559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko [PTRACE_EVENT_VFORK] = "VFORK", 202867559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko [PTRACE_EVENT_VFORK_DONE] = "VFORK_DONE", 202967559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko [PTRACE_EVENT_EXEC] = "EXEC", 203067559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko [PTRACE_EVENT_EXIT] = "EXIT", 20314e020c0f4b054a030ce8922906cdc217c4b2faf4Denys Vlasenko /* [PTRACE_EVENT_STOP (=128)] would make biggish array */ 203267559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko }; 20331b2bfbc8257231c18dcdd30b8a84eadffbe9417aDenys Vlasenko const char *e = "??"; 203467559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko if (event < ARRAY_SIZE(event_names)) 203567559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko e = event_names[event]; 20364e020c0f4b054a030ce8922906cdc217c4b2faf4Denys Vlasenko else if (event == PTRACE_EVENT_STOP) 20374e020c0f4b054a030ce8922906cdc217c4b2faf4Denys Vlasenko e = "STOP"; 20381b2bfbc8257231c18dcdd30b8a84eadffbe9417aDenys Vlasenko sprintf(evbuf, ",EVENT_%s (%u)", e, event); 203967559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko } 204067559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko fprintf(stderr, " [wait(0x%04x) = %u] %s%s\n", status, pid, buf, evbuf); 20411d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko } 204276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 2043f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko /* Look up 'pid' in our table. */ 20445d64581e106f47c474707001f924ee15ef22830bDenys Vlasenko tcp = pid2tcb(pid); 2045f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko 20468511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko if (!tcp) { 2047c8511f07aba78178f8528e22a8daa438347eb4faDenys Vlasenko if (!WIFSTOPPED(status)) { 2048c8511f07aba78178f8528e22a8daa438347eb4faDenys Vlasenko /* This can happen if we inherited 2049c8511f07aba78178f8528e22a8daa438347eb4faDenys Vlasenko * an unknown child. Example: 2050c8511f07aba78178f8528e22a8daa438347eb4faDenys Vlasenko * (sleep 1 & exec strace sleep 2) 2051c8511f07aba78178f8528e22a8daa438347eb4faDenys Vlasenko */ 2052c8511f07aba78178f8528e22a8daa438347eb4faDenys Vlasenko error_msg("Exit of unknown pid %u seen", pid); 2053c8511f07aba78178f8528e22a8daa438347eb4faDenys Vlasenko continue; 2054c8511f07aba78178f8528e22a8daa438347eb4faDenys Vlasenko } 20558511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko if (followfork) { 2056c8511f07aba78178f8528e22a8daa438347eb4faDenys Vlasenko /* We assume it's a fork/vfork/clone child */ 20578511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko tcp = alloctcb(pid); 20588511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko tcp->flags |= TCB_ATTACHED | TCB_STARTUP | post_attach_sigstop; 20598511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko newoutf(tcp); 20608511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko if (!qflag) 20618511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko fprintf(stderr, "Process %d attached\n", 20628511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko pid); 20638511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko } else { 20648511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko /* This can happen if a clone call used 2065c8511f07aba78178f8528e22a8daa438347eb4faDenys Vlasenko * CLONE_PTRACE itself. 206671d3d29a9d51add731c07e328a7394db0b3dd212Denys Vlasenko */ 2067c8511f07aba78178f8528e22a8daa438347eb4faDenys Vlasenko ptrace(PTRACE_CONT, pid, (char *) 0, 0); 2068c8511f07aba78178f8528e22a8daa438347eb4faDenys Vlasenko error_msg("Stop of unknown pid %u seen, PTRACE_CONTed it", pid); 206971d3d29a9d51add731c07e328a7394db0b3dd212Denys Vlasenko continue; 20708511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko } 20718511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko } 20728511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko 2073ce7d953ebecc10f71e191b6d18cfeb2399429d5fDenys Vlasenko clear_regs(); 2074ce7d953ebecc10f71e191b6d18cfeb2399429d5fDenys Vlasenko if (WIFSTOPPED(status)) 2075ce7d953ebecc10f71e191b6d18cfeb2399429d5fDenys Vlasenko get_regs(pid); 2076ce7d953ebecc10f71e191b6d18cfeb2399429d5fDenys Vlasenko 2077f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko /* Under Linux, execve changes pid to thread leader's pid, 2078f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko * and we see this changed pid on EVENT_EXEC and later, 2079f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko * execve sysexit. Leader "disappears" without exit 2080f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko * notification. Let user know that, drop leader's tcb, 2081f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko * and fix up pid in execve thread's tcb. 2082f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko * Effectively, execve thread's tcb replaces leader's tcb. 2083f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko * 2084f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko * BTW, leader is 'stuck undead' (doesn't report WIFEXITED 2085f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko * on exit syscall) in multithreaded programs exactly 2086f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko * in order to handle this case. 2087f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko * 2088f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko * PTRACE_GETEVENTMSG returns old pid starting from Linux 3.0. 2089f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko * On 2.6 and earlier, it can return garbage. 2090f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko */ 20916e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko if (event == PTRACE_EVENT_EXEC && os_release >= KERNEL_VERSION(3,0,0)) { 20926764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko FILE *fp; 20938511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko struct tcb *execve_thread; 2094f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko long old_pid = 0; 20958511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko 20968511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko if (ptrace(PTRACE_GETEVENTMSG, pid, NULL, (long) &old_pid) < 0) 20978511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko goto dont_switch_tcbs; 20988511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko if (old_pid <= 0 || old_pid == pid) 20998511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko goto dont_switch_tcbs; 21008511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko execve_thread = pid2tcb(old_pid); 21018511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko /* It should be !NULL, but I feel paranoid */ 21028511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko if (!execve_thread) 21038511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko goto dont_switch_tcbs; 21048511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko 21058511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko if (execve_thread->curcol != 0) { 21068511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko /* 21078511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko * One case we are here is -ff: 21088511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko * try "strace -oLOG -ff test/threaded_execve" 21098511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko */ 21108511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko fprintf(execve_thread->outf, " <pid changed to %d ...>\n", pid); 21116764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko /*execve_thread->curcol = 0; - no need, see code below */ 21128511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko } 21138511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko /* Swap output FILEs (needed for -ff) */ 21146764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko fp = execve_thread->outf; 21156764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko execve_thread->outf = tcp->outf; 21166764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko tcp->outf = fp; 21178511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko /* And their column positions */ 21186764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko execve_thread->curcol = tcp->curcol; 21196764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko tcp->curcol = 0; 21208511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko /* Drop leader, but close execve'd thread outfile (if -ff) */ 21218511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko droptcb(tcp); 21228511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko /* Switch to the thread, reusing leader's outfile and pid */ 21238511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko tcp = execve_thread; 21248511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko tcp->pid = pid; 21258511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko if (cflag != CFLAG_ONLY_STATS) { 21268511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko printleader(tcp); 21278511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko tprintf("+++ superseded by execve in pid %lu +++\n", old_pid); 21288511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko line_ended(); 21298511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko tcp->flags |= TCB_REPRINT; 2130f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko } 2131f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko } 21328511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko dont_switch_tcbs: 2133f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko 21342a3d27552f17a5b378344620bec7d255bac65a8dDenys Vlasenko if (event == PTRACE_EVENT_EXEC) { 21352a3d27552f17a5b378344620bec7d255bac65a8dDenys Vlasenko if (detach_on_execve && !skip_one_b_execve) 21362a3d27552f17a5b378344620bec7d255bac65a8dDenys Vlasenko detach(tcp); /* do "-b execve" thingy */ 21372a3d27552f17a5b378344620bec7d255bac65a8dDenys Vlasenko skip_one_b_execve = 0; 213861e7aad9fa1a6a5bd5a586e6276767caf12b53f2Denys Vlasenko } 213961e7aad9fa1a6a5bd5a586e6276767caf12b53f2Denys Vlasenko 21407de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko /* Set current output file */ 21416764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko current_tcp = tcp; 21427de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko 214313d22f1aa3a1beba79a8febb3770f75e646211a8Denys Vlasenko if (cflag) { 214476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman tv_sub(&tcp->dtime, &ru.ru_stime, &tcp->stime); 214576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman tcp->stime = ru.ru_stime; 214676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 2147eb9e2e8904ce85a6c7390be25bb873c6db88c4d3Roland McGrath 214876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman if (WIFSIGNALED(status)) { 2149a68096576afc07e51d33b49c432d658b27a7f13cDmitry V. Levin if (pid == strace_child) 2150a68096576afc07e51d33b49c432d658b27a7f13cDmitry V. Levin exit_code = 0x100 | WTERMSIG(status); 2151e3a7ef5a2a3ac31bfa0d3f9ce65981e51700073eDmitry V. Levin if (cflag != CFLAG_ONLY_STATS 2152a9fe13c9437707fa132fde4e51a20d88381e7430Denys Vlasenko && (qual_flags[WTERMSIG(status)] & QUAL_SIGNAL) 2153a9fe13c9437707fa132fde4e51a20d88381e7430Denys Vlasenko ) { 215476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman printleader(tcp); 215513d22f1aa3a1beba79a8febb3770f75e646211a8Denys Vlasenko#ifdef WCOREDUMP 2156000b601439d249a4afa2ceb6096850a702612d1eDenys Vlasenko tprintf("+++ killed by %s %s+++\n", 21572efe879fa8df30bf69c3a4c471dcc5e19ad0b6eaRoland McGrath signame(WTERMSIG(status)), 215813d22f1aa3a1beba79a8febb3770f75e646211a8Denys Vlasenko WCOREDUMP(status) ? "(core dumped) " : ""); 215913d22f1aa3a1beba79a8febb3770f75e646211a8Denys Vlasenko#else 2160000b601439d249a4afa2ceb6096850a702612d1eDenys Vlasenko tprintf("+++ killed by %s +++\n", 216113d22f1aa3a1beba79a8febb3770f75e646211a8Denys Vlasenko signame(WTERMSIG(status))); 21622efe879fa8df30bf69c3a4c471dcc5e19ad0b6eaRoland McGrath#endif 21637de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko line_ended(); 216476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 216576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman droptcb(tcp); 216676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman continue; 216776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 216876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman if (WIFEXITED(status)) { 2169a68096576afc07e51d33b49c432d658b27a7f13cDmitry V. Levin if (pid == strace_child) 2170a68096576afc07e51d33b49c432d658b27a7f13cDmitry V. Levin exit_code = WEXITSTATUS(status); 217101997cf32d4492b9898283ced45e8a4a6fd161b8Daniel P. Berrange if (cflag != CFLAG_ONLY_STATS && 217201997cf32d4492b9898283ced45e8a4a6fd161b8Daniel P. Berrange qflag < 2) { 217319cdada5b499b978ffd9c3367b4ef34ad6f8bf2bDenys Vlasenko printleader(tcp); 2174000b601439d249a4afa2ceb6096850a702612d1eDenys Vlasenko tprintf("+++ exited with %d +++\n", WEXITSTATUS(status)); 21757de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko line_ended(); 217619cdada5b499b978ffd9c3367b4ef34ad6f8bf2bDenys Vlasenko } 217776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman droptcb(tcp); 217876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman continue; 217976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 218076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman if (!WIFSTOPPED(status)) { 218176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman fprintf(stderr, "PANIC: pid %u not stopped\n", pid); 218276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman droptcb(tcp); 218376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman continue; 218476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 218576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 2186f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko /* Is this the very first time we see this tracee stopped? */ 2187f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko if (tcp->flags & TCB_STARTUP) { 2188a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko if (debug_flag) 2189f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko fprintf(stderr, "pid %d has TCB_STARTUP, initializing it\n", tcp->pid); 219076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman tcp->flags &= ~TCB_STARTUP; 219102203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath if (tcp->flags & TCB_BPTSET) { 219276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman /* 219302203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath * One example is a breakpoint inherited from 21942ecba32d52db699538bcfc3f69259aaff32a0fa9Denys Vlasenko * parent through fork(). 219576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman */ 21966cda73ff9ca94e2be56d04186fceaca223a9c45bDenys Vlasenko if (clearbpt(tcp) < 0) { 21976cda73ff9ca94e2be56d04186fceaca223a9c45bDenys Vlasenko /* Pretty fatal */ 219876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman droptcb(tcp); 2199d0ffdf494ac722f3d121c6e807f105000409e6a6Denys Vlasenko exit_code = 1; 2200d0ffdf494ac722f3d121c6e807f105000409e6a6Denys Vlasenko return; 220176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 220276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 220344f87efc676467ab47972feec49af4f7f34356bfDenys Vlasenko if (ptrace_setoptions) { 2204a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko if (debug_flag) 220544f87efc676467ab47972feec49af4f7f34356bfDenys Vlasenko fprintf(stderr, "setting opts %x on pid %d\n", ptrace_setoptions, tcp->pid); 220644f87efc676467ab47972feec49af4f7f34356bfDenys Vlasenko if (ptrace(PTRACE_SETOPTIONS, tcp->pid, NULL, ptrace_setoptions) < 0) { 220744f87efc676467ab47972feec49af4f7f34356bfDenys Vlasenko if (errno != ESRCH) { 220844f87efc676467ab47972feec49af4f7f34356bfDenys Vlasenko /* Should never happen, really */ 220944f87efc676467ab47972feec49af4f7f34356bfDenys Vlasenko perror_msg_and_die("PTRACE_SETOPTIONS"); 22103454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko } 22113454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko } 22123454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko } 2213f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko } 2214f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko 221531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko sig = WSTOPSIG(status); 221631fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 2217f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko if (event != 0) { 221831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko /* Ptrace event */ 22195c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko#if USE_SEIZE 222026bc0606d96d05d30ba263939a0451889340a64cDenys Vlasenko if (event == PTRACE_EVENT_STOP) { 22216703816060c2cf4aaf9c82057ced31c3ba744346Denys Vlasenko /* 22226703816060c2cf4aaf9c82057ced31c3ba744346Denys Vlasenko * PTRACE_INTERRUPT-stop or group-stop. 22236703816060c2cf4aaf9c82057ced31c3ba744346Denys Vlasenko * PTRACE_INTERRUPT-stop has sig == SIGTRAP here. 22246703816060c2cf4aaf9c82057ced31c3ba744346Denys Vlasenko */ 222531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (sig == SIGSTOP 222631fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko || sig == SIGTSTP 222731fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko || sig == SIGTTIN 222831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko || sig == SIGTTOU 222931fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko ) { 223031fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko stopped = 1; 223131fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko goto show_stopsig; 223231fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 223331fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 223431fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko#endif 2235f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko goto restart_tracee_with_sig_0; 2236f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko } 2237f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko 2238f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko /* Is this post-attach SIGSTOP? 2239f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko * Interestingly, the process may stop 2240f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko * with STOPSIG equal to some other signal 2241f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko * than SIGSTOP if we happend to attach 2242f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko * just before the process takes a signal. 2243f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko */ 2244f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko if (sig == SIGSTOP && (tcp->flags & TCB_IGNORE_ONE_SIGSTOP)) { 2245a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko if (debug_flag) 2246f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko fprintf(stderr, "ignored SIGSTOP on pid %d\n", tcp->pid); 2247f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko tcp->flags &= ~TCB_IGNORE_ONE_SIGSTOP; 22486cda73ff9ca94e2be56d04186fceaca223a9c45bDenys Vlasenko goto restart_tracee_with_sig_0; 224976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 225076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 22516cda73ff9ca94e2be56d04186fceaca223a9c45bDenys Vlasenko if (sig != syscall_trap_sig) { 225231fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko siginfo_t si; 225331fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 225431fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko /* Nonzero (true) if tracee is stopped by signal 225531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko * (as opposed to "tracee received signal"). 2256a44f9696e45f5bb51c6ec37c0ef95dc2cdfd4c8aDenys Vlasenko * TODO: shouldn't we check for errno == EINVAL too? 2257a44f9696e45f5bb51c6ec37c0ef95dc2cdfd4c8aDenys Vlasenko * We can get ESRCH instead, you know... 225831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko */ 225931fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko stopped = (ptrace(PTRACE_GETSIGINFO, pid, 0, (long) &si) < 0); 22605c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko#if USE_SEIZE 226131fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko show_stopsig: 22626703816060c2cf4aaf9c82057ced31c3ba744346Denys Vlasenko#endif 2263e3a7ef5a2a3ac31bfa0d3f9ce65981e51700073eDmitry V. Levin if (cflag != CFLAG_ONLY_STATS 2264e8ff4c6f863c16180dacff74988f0e617f8136d9Dmitry V. Levin && !hide_log_until_execve 2265e8ff4c6f863c16180dacff74988f0e617f8136d9Dmitry V. Levin && (qual_flags[sig] & QUAL_SIGNAL) 2266e8ff4c6f863c16180dacff74988f0e617f8136d9Dmitry V. Levin ) { 2267e8ff4c6f863c16180dacff74988f0e617f8136d9Dmitry V. Levin printleader(tcp); 2268e8ff4c6f863c16180dacff74988f0e617f8136d9Dmitry V. Levin if (!stopped) { 2269e8ff4c6f863c16180dacff74988f0e617f8136d9Dmitry V. Levin tprintf("--- %s ", signame(sig)); 2270e8ff4c6f863c16180dacff74988f0e617f8136d9Dmitry V. Levin printsiginfo(&si, verbose(tcp)); 22715a2483ba25fd80cb189abcdc14624be72b0c4c0bDenys Vlasenko tprints(" ---\n"); 2272e8ff4c6f863c16180dacff74988f0e617f8136d9Dmitry V. Levin } else 22735a2483ba25fd80cb189abcdc14624be72b0c4c0bDenys Vlasenko tprintf("--- stopped by %s ---\n", 22745a2483ba25fd80cb189abcdc14624be72b0c4c0bDenys Vlasenko signame(sig)); 2275e8ff4c6f863c16180dacff74988f0e617f8136d9Dmitry V. Levin line_ended(); 227676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 227731fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 227831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (!stopped) 227931fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko /* It's signal-delivery-stop. Inject the signal */ 228031fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko goto restart_tracee; 228131fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 228231fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko /* It's group-stop */ 228331fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (use_seize) { 228431fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko /* 228531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko * This ends ptrace-stop, but does *not* end group-stop. 228631fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko * This makes stopping signals work properly on straced process 228731fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko * (that is, process really stops. It used to continue to run). 228831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko */ 228931fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (ptrace_restart(PTRACE_LISTEN, tcp, 0) < 0) { 2290d0ffdf494ac722f3d121c6e807f105000409e6a6Denys Vlasenko /* Note: ptrace_restart emitted error message */ 2291d0ffdf494ac722f3d121c6e807f105000409e6a6Denys Vlasenko exit_code = 1; 2292d0ffdf494ac722f3d121c6e807f105000409e6a6Denys Vlasenko return; 229331fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 229431fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko continue; 229531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 229631fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko /* We don't have PTRACE_LISTEN support... */ 22976cda73ff9ca94e2be56d04186fceaca223a9c45bDenys Vlasenko goto restart_tracee; 229876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 22992ecba32d52db699538bcfc3f69259aaff32a0fa9Denys Vlasenko 23002ecba32d52db699538bcfc3f69259aaff32a0fa9Denys Vlasenko /* We handled quick cases, we are permitted to interrupt now. */ 230102203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath if (interrupted) 2302d0ffdf494ac722f3d121c6e807f105000409e6a6Denys Vlasenko return; 23032ecba32d52db699538bcfc3f69259aaff32a0fa9Denys Vlasenko 23042ecba32d52db699538bcfc3f69259aaff32a0fa9Denys Vlasenko /* This should be syscall entry or exit. 23052ecba32d52db699538bcfc3f69259aaff32a0fa9Denys Vlasenko * (Or it still can be that pesky post-execve SIGTRAP!) 23062ecba32d52db699538bcfc3f69259aaff32a0fa9Denys Vlasenko * Handle it. 23072ecba32d52db699538bcfc3f69259aaff32a0fa9Denys Vlasenko */ 2308235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko if (trace_syscall(tcp) < 0) { 2309235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko /* ptrace() failed in trace_syscall(). 2310eb9e2e8904ce85a6c7390be25bb873c6db88c4d3Roland McGrath * Likely a result of process disappearing mid-flight. 2311235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko * Observed case: exit_group() or SIGKILL terminating 2312f1e690370359f61f9533134817b52d74460a20fbDenys Vlasenko * all processes in thread group. 23137de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko * We assume that ptrace error was caused by process death. 2314f20250266eb5988805b03b1cc0fa74cdb6398742Denys Vlasenko * We used to detach(tcp) here, but since we no longer 2315f20250266eb5988805b03b1cc0fa74cdb6398742Denys Vlasenko * implement "detach before death" policy/hack, 2316f20250266eb5988805b03b1cc0fa74cdb6398742Denys Vlasenko * we can let this process to report its death to us 2317f20250266eb5988805b03b1cc0fa74cdb6398742Denys Vlasenko * normally, via WIFEXITED or WIFSIGNALED wait status. 2318f20250266eb5988805b03b1cc0fa74cdb6398742Denys Vlasenko */ 231976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman continue; 232076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 23216cda73ff9ca94e2be56d04186fceaca223a9c45bDenys Vlasenko restart_tracee_with_sig_0: 23226cda73ff9ca94e2be56d04186fceaca223a9c45bDenys Vlasenko sig = 0; 23236cda73ff9ca94e2be56d04186fceaca223a9c45bDenys Vlasenko restart_tracee: 23246cda73ff9ca94e2be56d04186fceaca223a9c45bDenys Vlasenko if (ptrace_restart(PTRACE_SYSCALL, tcp, sig) < 0) { 2325d0ffdf494ac722f3d121c6e807f105000409e6a6Denys Vlasenko /* Note: ptrace_restart emitted error message */ 2326d0ffdf494ac722f3d121c6e807f105000409e6a6Denys Vlasenko exit_code = 1; 2327d0ffdf494ac722f3d121c6e807f105000409e6a6Denys Vlasenko return; 232876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 2329d0ffdf494ac722f3d121c6e807f105000409e6a6Denys Vlasenko } /* while (nprocs != 0) */ 233076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman} 2331ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko 2332ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenkoint 2333ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenkomain(int argc, char *argv[]) 2334ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko{ 2335ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko init(argc, argv); 2336ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko 2337ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko /* Run main tracing loop */ 2338d0ffdf494ac722f3d121c6e807f105000409e6a6Denys Vlasenko trace(); 2339ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko 2340ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko cleanup(); 2341ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko fflush(NULL); 2342cf53436f737c0273028503186fc0f837c7191085Dmitry V. Levin if (shared_log != stderr) 2343cf53436f737c0273028503186fc0f837c7191085Dmitry V. Levin fclose(shared_log); 2344cf53436f737c0273028503186fc0f837c7191085Dmitry V. Levin if (popen_pid) { 2345cf53436f737c0273028503186fc0f837c7191085Dmitry V. Levin while (waitpid(popen_pid, NULL, 0) < 0 && errno == EINTR) 2346cf53436f737c0273028503186fc0f837c7191085Dmitry V. Levin ; 2347cf53436f737c0273028503186fc0f837c7191085Dmitry V. Levin } 2348ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko if (exit_code > 0xff) { 2349ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko /* Avoid potential core file clobbering. */ 2350c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin struct_rlimit rlim = {0, 0}; 2351c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin set_rlimit(RLIMIT_CORE, &rlim); 2352ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko 2353ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko /* Child was killed by a signal, mimic that. */ 2354ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko exit_code &= 0xff; 2355ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko signal(exit_code, SIG_DFL); 2356ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko raise(exit_code); 2357ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko /* Paranoia - what if this signal is not fatal? 2358ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko Exit with 128 + signo then. */ 2359ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko exit_code += 128; 2360ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko } 2361ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko 2362ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko return exit_code; 2363ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko} 2364