strace.c revision f1669e7975cb8d67448d52d9ae7dde3301d27273
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 1604c1963836fd96909c2d86315d4972b5b0075edf6Denys Vlasenkostatic int detach(struct tcb *tcp); 161e5355de95c495dcfc616509f88c4fb5f9996b8e6Andreas Schwabstatic int trace(void); 162e5355de95c495dcfc616509f88c4fb5f9996b8e6Andreas Schwabstatic void cleanup(void); 163e5355de95c495dcfc616509f88c4fb5f9996b8e6Andreas Schwabstatic void interrupt(int sig); 16476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkermanstatic sigset_t empty_set, blocked_set; 16576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 16676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman#ifdef HAVE_SIG_ATOMIC_T 16776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkermanstatic volatile sig_atomic_t interrupted; 168a3559250d48ccc3ef755183ebb3246cbbb442c0dDenys Vlasenko#else 16976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkermanstatic volatile int interrupted; 170a3559250d48ccc3ef755183ebb3246cbbb442c0dDenys Vlasenko#endif 17176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 1722c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko#ifndef HAVE_STRERROR 1732c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko 1742c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko#if !HAVE_DECL_SYS_ERRLIST 1752c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenkoextern int sys_nerr; 1762c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenkoextern char *sys_errlist[]; 177a6d91ded3f2d5401e09a9c2fa442aabfbfe593a8Denys Vlasenko#endif 1782c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko 1792c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenkoconst char * 1802c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenkostrerror(int err_no) 1812c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko{ 1822c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko static char buf[sizeof("Unknown error %d") + sizeof(int)*3]; 1832c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko 1842c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko if (err_no < 1 || err_no >= sys_nerr) { 1852c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko sprintf(buf, "Unknown error %d", err_no); 1862c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko return buf; 1872c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko } 1882c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko return sys_errlist[err_no]; 1892c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko} 1902c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko 1912c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko#endif /* HAVE_STERRROR */ 1922c4fb905fef268a7e359ce3acaec4ee7ef087996Denys Vlasenko 19376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkermanstatic void 194cb2ad00652e746b370703b5470932b7612308b9cDenys Vlasenkousage(FILE *ofp, int exitval) 19576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman{ 19676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman fprintf(ofp, "\ 197c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenkousage: strace [-CdffhiqrtttTvVxxy] [-I n] [-e expr]...\n\ 198c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko [-a column] [-o file] [-s strsize] [-P path]...\n\ 199c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko -p pid... / [-D] [-E var=val]... [-u username] PROG [ARGS]\n\ 200c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko or: strace -c[df] [-I n] [-e expr]... [-O overhead] [-S sortby]\n\ 201c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko -p pid... / [-D] [-E var=val]... [-u username] PROG [ARGS]\n\ 20276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-c -- count time, calls, and errors for each syscall and report summary\n\ 203c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko-C -- like -c but also print regular output\n\ 2043e084ac349c3b177a75916254a4a5a02f29969e2Denys Vlasenko-d -- enable debug output to stderr\n\ 205b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko-D -- run tracer process as a detached grandchild, not as parent\n\ 20676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-f -- follow forks, -ff -- with output into separate files\n\ 20776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-i -- print instruction pointer at time of syscall\n\ 20876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-q -- suppress messages about attaching, detaching, etc.\n\ 20976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-r -- print relative timestamp, -t -- absolute timestamp, -tt -- with usecs\n\ 210cdab1becb03eeae442719027fc26a17da464e5deDenys Vlasenko-T -- print time spent in each syscall\n\ 211cdab1becb03eeae442719027fc26a17da464e5deDenys Vlasenko-v -- verbose mode: print unabbreviated argv, stat, termios, etc. args\n\ 21276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-x -- print non-ascii strings in hex, -xx -- print all strings in hex\n\ 2138a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards-y -- print paths associated with file descriptor arguments\n\ 214c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko-h -- print help message, -V -- print version\n\ 21576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-a column -- alignment COLUMN for printing syscall results (default %d)\n\ 21622efaf0028ddec8f9ed2a2a11e9baaa201594a33Denys Vlasenko-b execve -- detach on this syscall\n\ 21776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-e expr -- a qualifying expression: option=[!]all or option=[!]val1[,val2]...\n\ 21838e79bbb25bca8b79ae2866b93c4ddf26dea2b13Denys Vlasenko options: trace, abbrev, verbose, raw, signal, read, write\n\ 219c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko-I interruptible --\n\ 220c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko 1: no signals are blocked\n\ 221c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko 2: fatal signals are blocked while decoding syscall (default)\n\ 222c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko 3: fatal signals are always blocked (default if '-o FILE PROG')\n\ 223c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko 4: fatal signals and SIGTSTP (^Z) are always blocked\n\ 224c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko (useful to make 'strace -o FILE PROG' not stop on ^Z)\n\ 22576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-o file -- send trace output to FILE instead of stderr\n\ 22676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-O overhead -- set overhead for tracing syscalls to OVERHEAD usecs\n\ 22776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-p pid -- trace process with process id PID, may be repeated\n\ 22876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-s strsize -- limit length of print strings to STRSIZE chars (default %d)\n\ 22976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-S sortby -- sort syscall counts by: time, calls, name, nothing (default %s)\n\ 23076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman-u username -- run command as username handling setuid and/or setgid\n\ 231de6e53308ca58da7d357f8114afc74fff7a18043Roland McGrath-E var=val -- put var=val in the environment for command\n\ 232de6e53308ca58da7d357f8114afc74fff7a18043Roland McGrath-E var -- remove var from the environment for command\n\ 2338a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards-P path -- trace accesses to path\n\ 23461e7aad9fa1a6a5bd5a586e6276767caf12b53f2Denys Vlasenko" 23538e79bbb25bca8b79ae2866b93c4ddf26dea2b13Denys Vlasenko/* ancient, no one should use it 23638e79bbb25bca8b79ae2866b93c4ddf26dea2b13Denys Vlasenko-F -- attempt to follow vforks (deprecated, use -f)\n\ 23738e79bbb25bca8b79ae2866b93c4ddf26dea2b13Denys Vlasenko */ 23861e7aad9fa1a6a5bd5a586e6276767caf12b53f2Denys Vlasenko/* this is broken, so don't document it 23917f8fb3484e94976882f65b7a3aaffc6f24cd75dMichal Ludvig-z -- print only succeeding syscalls\n\ 24061e7aad9fa1a6a5bd5a586e6276767caf12b53f2Denys Vlasenko */ 241de6e53308ca58da7d357f8114afc74fff7a18043Roland McGrath, DEFAULT_ACOLUMN, DEFAULT_STRLEN, DEFAULT_SORTBY); 24276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman exit(exitval); 24376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman} 24476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 24575422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenkostatic void die(void) __attribute__ ((noreturn)); 24675422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenkostatic void die(void) 24775422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko{ 24875422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko if (strace_tracer_pid == getpid()) { 24975422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko cflag = 0; 25075422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko cleanup(); 25175422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko } 25275422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko exit(1); 25375422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko} 25475422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko 25575422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenkostatic void verror_msg(int err_no, const char *fmt, va_list p) 2563454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko{ 25782bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko char *msg; 25882bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko 25944d053218ba658c901c3ab7dd905ab31ba417286Dmitry V. Levin fflush(NULL); 26082bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko 26182bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko /* We want to print entire message with single fprintf to ensure 26282bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko * message integrity if stderr is shared with other programs. 26382bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko * Thus we use vasprintf + single fprintf. 26482bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko */ 26582bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko msg = NULL; 266cfad543087d98c5313fd7f006c0de69a1d87dc8eDenys Vlasenko if (vasprintf(&msg, fmt, p) >= 0) { 26782bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko if (err_no) 26882bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko fprintf(stderr, "%s: %s: %s\n", progname, msg, strerror(err_no)); 26982bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko else 27082bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko fprintf(stderr, "%s: %s\n", progname, msg); 27182bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko free(msg); 27282bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko } else { 27382bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko /* malloc in vasprintf failed, try it without malloc */ 27482bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko fprintf(stderr, "%s: ", progname); 27582bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko vfprintf(stderr, fmt, p); 27682bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko if (err_no) 27782bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko fprintf(stderr, ": %s\n", strerror(err_no)); 27882bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko else 27982bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko putc('\n', stderr); 28082bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko } 28182bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko /* We don't switch stderr to buffered, thus fprintf(stderr) 28282bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko * always flushes its output and this is not necessary: */ 28382bb78c149a1b527f4ae7a764be29a9c85067b29Denys Vlasenko /* fflush(stderr); */ 28475422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko} 28575422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko 28675422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenkovoid error_msg(const char *fmt, ...) 28775422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko{ 28875422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko va_list p; 28975422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko va_start(p, fmt); 29075422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko verror_msg(0, fmt, p); 2913454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko va_end(p); 29275422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko} 2933454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko 29475422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenkovoid error_msg_and_die(const char *fmt, ...) 29575422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko{ 29675422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko va_list p; 29775422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko va_start(p, fmt); 29875422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko verror_msg(0, fmt, p); 29975422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko die(); 30075422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko} 30175422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko 30275422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenkovoid perror_msg(const char *fmt, ...) 30375422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko{ 30475422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko va_list p; 30575422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko va_start(p, fmt); 30675422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko verror_msg(errno, fmt, p); 30775422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko va_end(p); 30875422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko} 30975422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko 31075422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenkovoid perror_msg_and_die(const char *fmt, ...) 31175422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko{ 31275422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko va_list p; 31375422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko va_start(p, fmt); 31475422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko verror_msg(errno, fmt, p); 31575422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko die(); 3163454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko} 3173454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko 3181d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenkovoid die_out_of_memory(void) 3191d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko{ 3201d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko static bool recursed = 0; 3211d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko if (recursed) 3221d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko exit(1); 3231d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko recursed = 1; 3241d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko error_msg_and_die("Out of memory"); 3251d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko} 3261d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko 327ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levinstatic void 328ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levinerror_opt_arg(int opt, const char *arg) 329ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin{ 330ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin error_msg_and_die("Invalid -%c argument: '%s'", opt, arg); 331ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin} 332ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin 3335c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko#if USE_SEIZE 33431fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenkostatic int 33531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenkoptrace_attach_or_seize(int pid) 33631fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko{ 33731fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko int r; 33831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (!use_seize) 33931fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko return ptrace(PTRACE_ATTACH, pid, 0, 0); 34026bc0606d96d05d30ba263939a0451889340a64cDenys Vlasenko r = ptrace(PTRACE_SEIZE, pid, 0, 0); 34131fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (r) 34231fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko return r; 34331fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko r = ptrace(PTRACE_INTERRUPT, pid, 0, 0); 34431fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko return r; 34531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko} 34631fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko#else 34731fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko# define ptrace_attach_or_seize(pid) ptrace(PTRACE_ATTACH, (pid), 0, 0) 34831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko#endif 34931fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 350852f98a3824f6b8359df744af5772306410341abDenys Vlasenko/* 351852f98a3824f6b8359df744af5772306410341abDenys Vlasenko * Used when we want to unblock stopped traced process. 352852f98a3824f6b8359df744af5772306410341abDenys Vlasenko * Should be only used with PTRACE_CONT, PTRACE_DETACH and PTRACE_SYSCALL. 353852f98a3824f6b8359df744af5772306410341abDenys Vlasenko * Returns 0 on success or if error was ESRCH 354852f98a3824f6b8359df744af5772306410341abDenys Vlasenko * (presumably process was killed while we talk to it). 355852f98a3824f6b8359df744af5772306410341abDenys Vlasenko * Otherwise prints error message and returns -1. 356852f98a3824f6b8359df744af5772306410341abDenys Vlasenko */ 357852f98a3824f6b8359df744af5772306410341abDenys Vlasenkostatic int 358852f98a3824f6b8359df744af5772306410341abDenys Vlasenkoptrace_restart(int op, struct tcb *tcp, int sig) 359852f98a3824f6b8359df744af5772306410341abDenys Vlasenko{ 360852f98a3824f6b8359df744af5772306410341abDenys Vlasenko int err; 361852f98a3824f6b8359df744af5772306410341abDenys Vlasenko const char *msg; 362852f98a3824f6b8359df744af5772306410341abDenys Vlasenko 363852f98a3824f6b8359df744af5772306410341abDenys Vlasenko errno = 0; 364852f98a3824f6b8359df744af5772306410341abDenys Vlasenko ptrace(op, tcp->pid, (void *) 0, (long) sig); 365852f98a3824f6b8359df744af5772306410341abDenys Vlasenko err = errno; 366235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko if (!err) 367852f98a3824f6b8359df744af5772306410341abDenys Vlasenko return 0; 368852f98a3824f6b8359df744af5772306410341abDenys Vlasenko 369852f98a3824f6b8359df744af5772306410341abDenys Vlasenko msg = "SYSCALL"; 370852f98a3824f6b8359df744af5772306410341abDenys Vlasenko if (op == PTRACE_CONT) 371852f98a3824f6b8359df744af5772306410341abDenys Vlasenko msg = "CONT"; 372852f98a3824f6b8359df744af5772306410341abDenys Vlasenko if (op == PTRACE_DETACH) 373852f98a3824f6b8359df744af5772306410341abDenys Vlasenko msg = "DETACH"; 374852f98a3824f6b8359df744af5772306410341abDenys Vlasenko#ifdef PTRACE_LISTEN 375852f98a3824f6b8359df744af5772306410341abDenys Vlasenko if (op == PTRACE_LISTEN) 376852f98a3824f6b8359df744af5772306410341abDenys Vlasenko msg = "LISTEN"; 377852f98a3824f6b8359df744af5772306410341abDenys Vlasenko#endif 378235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko /* 379235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko * Why curcol != 0? Otherwise sometimes we get this: 380235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko * 381235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko * 10252 kill(10253, SIGKILL) = 0 382235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko * <ptrace(SYSCALL,10252):No such process>10253 ...next decode... 383235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko * 384235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko * 10252 died after we retrieved syscall exit data, 385235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko * but before we tried to restart it. Log looks ugly. 386235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko */ 3876764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko if (current_tcp && current_tcp->curcol != 0) { 388235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko tprintf(" <ptrace(%s):%s>\n", msg, strerror(err)); 389235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko line_ended(); 390235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko } 391235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko if (err == ESRCH) 392235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko return 0; 393235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko errno = err; 394852f98a3824f6b8359df744af5772306410341abDenys Vlasenko perror_msg("ptrace(PTRACE_%s,pid:%d,sig:%d)", msg, tcp->pid, sig); 395852f98a3824f6b8359df744af5772306410341abDenys Vlasenko return -1; 396852f98a3824f6b8359df744af5772306410341abDenys Vlasenko} 397852f98a3824f6b8359df744af5772306410341abDenys Vlasenko 3981f532ab27db945c33818ba5298fdd78c52d229eaDenys Vlasenkostatic void 39910de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levinset_cloexec_flag(int fd) 40010de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin{ 4011f532ab27db945c33818ba5298fdd78c52d229eaDenys Vlasenko int flags, newflags; 4021f532ab27db945c33818ba5298fdd78c52d229eaDenys Vlasenko 4031f532ab27db945c33818ba5298fdd78c52d229eaDenys Vlasenko flags = fcntl(fd, F_GETFD); 4041f532ab27db945c33818ba5298fdd78c52d229eaDenys Vlasenko if (flags < 0) { 4051f532ab27db945c33818ba5298fdd78c52d229eaDenys Vlasenko /* Can happen only if fd is bad. 4061f532ab27db945c33818ba5298fdd78c52d229eaDenys Vlasenko * Should never happen: if it does, we have a bug 4071f532ab27db945c33818ba5298fdd78c52d229eaDenys Vlasenko * in the caller. Therefore we just abort 4081f532ab27db945c33818ba5298fdd78c52d229eaDenys Vlasenko * instead of propagating the error. 4091f532ab27db945c33818ba5298fdd78c52d229eaDenys Vlasenko */ 4101f532ab27db945c33818ba5298fdd78c52d229eaDenys Vlasenko perror_msg_and_die("fcntl(%d, F_GETFD)", fd); 41110de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin } 41210de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 41310de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin newflags = flags | FD_CLOEXEC; 41410de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin if (flags == newflags) 4151f532ab27db945c33818ba5298fdd78c52d229eaDenys Vlasenko return; 41610de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 4171f532ab27db945c33818ba5298fdd78c52d229eaDenys Vlasenko fcntl(fd, F_SETFD, newflags); /* never fails */ 41810de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin} 41910de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 42075fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenkostatic void kill_save_errno(pid_t pid, int sig) 42175fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko{ 42275fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko int saved_errno = errno; 42375fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko 42475fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko (void) kill(pid, sig); 42575fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko errno = saved_errno; 42675fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko} 42775fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko 428800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko/* 429800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko * When strace is setuid executable, we have to swap uids 430800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko * before and after filesystem and process management operations. 431800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko */ 432800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkostatic void 433800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkoswap_uid(void) 434800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko{ 435800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko int euid = geteuid(), uid = getuid(); 436800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 437800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (euid != uid && setreuid(euid, uid) < 0) { 438800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko perror_msg_and_die("setreuid"); 439800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } 440800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko} 441800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 442800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko#if _LFS64_LARGEFILE 443800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko# define fopen_for_output fopen64 444c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin# define struct_stat struct stat64 445c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin# define stat_file stat64 446c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin# define struct_dirent struct dirent64 447c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin# define read_dir readdir64 448c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin# define struct_rlimit struct rlimit64 449c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin# define set_rlimit setrlimit64 450800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko#else 451800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko# define fopen_for_output fopen 452c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin# define struct_stat struct stat 453c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin# define stat_file stat 454c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin# define struct_dirent struct dirent 455c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin# define read_dir readdir 456c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin# define struct_rlimit struct rlimit 457c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin# define set_rlimit setrlimit 458800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko#endif 459800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 460800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkostatic FILE * 461800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkostrace_fopen(const char *path) 462800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko{ 463800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko FILE *fp; 464800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 465800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko swap_uid(); 466800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko fp = fopen_for_output(path, "w"); 467800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (!fp) 468800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko perror_msg_and_die("Can't fopen '%s'", path); 469800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko swap_uid(); 470800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko set_cloexec_flag(fileno(fp)); 471800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko return fp; 472800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko} 473800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 474800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkostatic int popen_pid = 0; 475800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 476800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko#ifndef _PATH_BSHELL 477800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko# define _PATH_BSHELL "/bin/sh" 478800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko#endif 479800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 480800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko/* 481800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko * We cannot use standard popen(3) here because we have to distinguish 482800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko * popen child process from other processes we trace, and standard popen(3) 483800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko * does not export its child's pid. 484800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko */ 485800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkostatic FILE * 486800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkostrace_popen(const char *command) 487800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko{ 488800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko FILE *fp; 489800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko int fds[2]; 490800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 491800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko swap_uid(); 492800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (pipe(fds) < 0) 493800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko perror_msg_and_die("pipe"); 494800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 495800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko set_cloexec_flag(fds[1]); /* never fails */ 496800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 497800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko popen_pid = vfork(); 498800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (popen_pid == -1) 499800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko perror_msg_and_die("vfork"); 500800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 501800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (popen_pid == 0) { 502800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko /* child */ 503800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko close(fds[1]); 504800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (fds[0] != 0) { 505800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (dup2(fds[0], 0)) 506800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko perror_msg_and_die("dup2"); 507800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko close(fds[0]); 508800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } 509800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko execl(_PATH_BSHELL, "sh", "-c", command, NULL); 510800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko perror_msg_and_die("Can't execute '%s'", _PATH_BSHELL); 511800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } 512800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 513800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko /* parent */ 514800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko close(fds[0]); 515800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko swap_uid(); 516800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko fp = fdopen(fds[1], "w"); 517800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (!fp) 518800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko die_out_of_memory(); 519800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko return fp; 520800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko} 521800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 5222e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenkovoid 5232e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenkotprintf(const char *fmt, ...) 5242e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko{ 5252e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko va_list args; 5262e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko 5272e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko va_start(args, fmt); 5286764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko if (current_tcp) { 5296e4f3c1fa41851cb72230432db4be8e0c2993c7dDenys Vlasenko int n = strace_vfprintf(current_tcp->outf, fmt, args); 5302e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko if (n < 0) { 5316764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko if (current_tcp->outf != stderr) 5329a71bcdab254e4cd93b8f1e93c659644eb70ea9bDmitry V. Levin perror_msg("%s", outfname); 5332e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko } else 5346764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko current_tcp->curcol += n; 5352e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko } 5362e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko va_end(args); 5372e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko} 5382e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko 5392e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenkovoid 5402e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenkotprints(const char *str) 5412e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko{ 5426764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko if (current_tcp) { 543142aee0a593ea9b42aa98347d998176b8a4e2489Denys Vlasenko int n = fputs_unlocked(str, current_tcp->outf); 5442e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko if (n >= 0) { 5456764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko current_tcp->curcol += strlen(str); 5462e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko return; 5472e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko } 5486764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko if (current_tcp->outf != stderr) 5499a71bcdab254e4cd93b8f1e93c659644eb70ea9bDmitry V. Levin perror_msg("%s", outfname); 5502e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko } 5512e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko} 5522e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko 5532e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenkovoid 5547de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenkoline_ended(void) 5557de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko{ 5566764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko if (current_tcp) { 5576764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko current_tcp->curcol = 0; 5586764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko fflush(current_tcp->outf); 5596764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko } 5606764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko if (printing_tcp) { 5616764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko printing_tcp->curcol = 0; 5626764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko printing_tcp = NULL; 5636764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko } 5647de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko} 5657de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko 5667de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenkovoid 5672e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenkoprintleader(struct tcb *tcp) 5682e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko{ 5697de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko /* If -ff, "previous tcb we printed" is always the same as current, 5707de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko * because we have per-tcb output files. 5717de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko */ 5727de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko if (followfork >= 2) 5737de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko printing_tcp = tcp; 5747de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko 5752e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko if (printing_tcp) { 5766764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko current_tcp = printing_tcp; 5777de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko if (printing_tcp->curcol != 0 && (followfork < 2 || printing_tcp == tcp)) { 5787de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko /* 5797de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko * case 1: we have a shared log (i.e. not -ff), and last line 5807de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko * wasn't finished (same or different tcb, doesn't matter). 5817de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko * case 2: split log, we are the same tcb, but our last line 5827de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko * didn't finish ("SIGKILL nuked us after syscall entry" etc). 5837de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko */ 5842e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko tprints(" <unfinished ...>\n"); 5857de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko printing_tcp->curcol = 0; 5862e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko } 5872e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko } 5882e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko 5892e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko printing_tcp = tcp; 5906764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko current_tcp = tcp; 5916764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko current_tcp->curcol = 0; 5922e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko 5932e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko if (print_pid_pfx) 5942e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko tprintf("%-5d ", tcp->pid); 5952e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko else if (nprocs > 1 && !outfname) 5962e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko tprintf("[pid %5u] ", tcp->pid); 5972e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko 5982e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko if (tflag) { 5992e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko char str[sizeof("HH:MM:SS")]; 6002e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko struct timeval tv, dtv; 6012e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko static struct timeval otv; 6022e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko 6032e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko gettimeofday(&tv, NULL); 6042e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko if (rflag) { 6052e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko if (otv.tv_sec == 0) 6062e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko otv = tv; 6072e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko tv_sub(&dtv, &tv, &otv); 6082e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko tprintf("%6ld.%06ld ", 6092e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko (long) dtv.tv_sec, (long) dtv.tv_usec); 6102e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko otv = tv; 6112e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko } 6122e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko else if (tflag > 2) { 6132e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko tprintf("%ld.%06ld ", 6142e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko (long) tv.tv_sec, (long) tv.tv_usec); 6152e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko } 6162e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko else { 6172e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko time_t local = tv.tv_sec; 6182e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko strftime(str, sizeof(str), "%T", localtime(&local)); 6192e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko if (tflag > 1) 6202e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko tprintf("%s.%06ld ", str, (long) tv.tv_usec); 6212e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko else 6222e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko tprintf("%s ", str); 6232e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko } 6242e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko } 6252e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko if (iflag) 6262e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko printcall(tcp); 6272e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko} 6282e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko 6292e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenkovoid 6302e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenkotabto(void) 6312e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko{ 6326764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko if (current_tcp->curcol < acolumn) 6336764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko tprints(acolumn_spaces + current_tcp->curcol); 6342e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko} 6352e856a1c9215d292a7c41695928e8552788bc43cDenys Vlasenko 6363db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko/* Should be only called directly *after successful attach* to a tracee. 6373db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko * Otherwise, "strace -oFILE -ff -p<nonexistant_pid>" 6383db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko * may create bogus empty FILE.<nonexistant_pid>, and then die. 6393db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko */ 64010de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levinstatic void 641800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkonewoutf(struct tcb *tcp) 64210de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin{ 6436764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko tcp->outf = shared_log; /* if not -ff mode, the same file is for all */ 6443db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko if (followfork >= 2) { 645800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko char name[520 + sizeof(int) * 3]; 646800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko sprintf(name, "%.512s.%u", outfname, tcp->pid); 647800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko tcp->outf = strace_fopen(name); 64810de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin } 64910de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin} 65010de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 651800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkostatic void 652800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkoexpand_tcbtab(void) 653800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko{ 654800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko /* Allocate some more TCBs and expand the table. 655800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko We don't want to relocate the TCBs because our 656800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko callers have pointers and it would be a pain. 657800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko So tcbtab is a table of pointers. Since we never 658800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko free the TCBs, we allocate a single chunk of many. */ 659800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko int i = tcbtabsize; 660800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko struct tcb *newtcbs = calloc(tcbtabsize, sizeof(newtcbs[0])); 661800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko struct tcb **newtab = realloc(tcbtab, tcbtabsize * 2 * sizeof(tcbtab[0])); 662800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (!newtab || !newtcbs) 663800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko die_out_of_memory(); 664800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko tcbtabsize *= 2; 665800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko tcbtab = newtab; 666800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko while (i < tcbtabsize) 667800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko tcbtab[i++] = newtcbs++; 668800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko} 6694bfa6266eb6c67fce50907b427dff6bbd9e93794Roland McGrath 670800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkostatic struct tcb * 6713db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenkoalloctcb(int pid) 67210de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin{ 673800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko int i; 674800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko struct tcb *tcp; 67510de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 676800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (nprocs == tcbtabsize) 677800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko expand_tcbtab(); 678800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 679800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko for (i = 0; i < tcbtabsize; i++) { 680800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko tcp = tcbtab[i]; 681800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if ((tcp->flags & TCB_INUSE) == 0) { 682800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko memset(tcp, 0, sizeof(*tcp)); 683800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko tcp->pid = pid; 684800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko tcp->flags = TCB_INUSE; 685800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko#if SUPPORTED_PERSONALITIES > 1 686800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko tcp->currpers = current_personality; 687800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko#endif 688800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko nprocs++; 689800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (debug_flag) 690800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko fprintf(stderr, "new tcb for pid %d, active tcbs:%d\n", tcp->pid, nprocs); 691800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko return tcp; 692800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } 693800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } 6943db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko error_msg_and_die("bug in alloctcb"); 69510de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin} 69610de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 697800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkostatic void 698800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkodroptcb(struct tcb *tcp) 699800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko{ 700800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (tcp->pid == 0) 701800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko return; 70210de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 703800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko nprocs--; 704800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (debug_flag) 705800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko fprintf(stderr, "dropped tcb for pid %d, %d remain\n", tcp->pid, nprocs); 70610de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 707800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (tcp->outf) { 7088511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko if (followfork >= 2) { 709800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (tcp->curcol != 0) 710800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko fprintf(tcp->outf, " <detached ...>\n"); 711800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko fclose(tcp->outf); 712800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } else { 713800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (printing_tcp == tcp && tcp->curcol != 0) 714800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko fprintf(tcp->outf, " <detached ...>\n"); 715800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko fflush(tcp->outf); 716800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } 717800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } 718800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 7196764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko if (current_tcp == tcp) 7206764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko current_tcp = NULL; 721800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (printing_tcp == tcp) 722800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko printing_tcp = NULL; 723800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 724800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko memset(tcp, 0, sizeof(*tcp)); 725800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko} 726800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 727f1669e7975cb8d67448d52d9ae7dde3301d27273Denys Vlasenko/* Detach traced process. 728800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko * Never call DETACH twice on the same process as both unattached and 729800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko * attached-unstopped processes give the same ESRCH. For unattached process we 730800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko * would SIGSTOP it and wait for its SIGSTOP notification forever. 73110de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin */ 732800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkostatic int 733800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenkodetach(struct tcb *tcp) 73410de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin{ 735800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko int error; 736800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko int status, sigstop_expected; 73710de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 738800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (tcp->flags & TCB_BPTSET) 739800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko clearbpt(tcp); 74010de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 741800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko /* 742800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko * Linux wrongly insists the child be stopped 743800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko * before detaching. Arghh. We go through hoops 744800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko * to make a clean break of things. 745800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko */ 746800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko#if defined(SPARC) 747978fbc901c4fe260caaa5881e54bd9cb54022101Denys Vlasenko# undef PTRACE_DETACH 748978fbc901c4fe260caaa5881e54bd9cb54022101Denys Vlasenko# define PTRACE_DETACH PTRACE_SUNDETACH 749800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko#endif 75010de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 751800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko error = 0; 752800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko sigstop_expected = 0; 753800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (tcp->flags & TCB_ATTACHED) { 754800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko /* 755800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko * We attached but possibly didn't see the expected SIGSTOP. 756800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko * We must catch exactly one as otherwise the detached process 757800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko * would be left stopped (process state T). 758800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko */ 759800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko sigstop_expected = (tcp->flags & TCB_IGNORE_ONE_SIGSTOP); 760800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko error = ptrace(PTRACE_DETACH, tcp->pid, (char *) 1, 0); 761800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (error == 0) { 762800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko /* On a clear day, you can see forever. */ 763800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } 764800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko else if (errno != ESRCH) { 765800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko /* Shouldn't happen. */ 766905e8e0e2f0a1f51ab92424dcb005885ea8b2459Denys Vlasenko perror_msg("detach: ptrace(PTRACE_DETACH, ...)"); 767800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } 768800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko else if (my_tkill(tcp->pid, 0) < 0) { 769800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (errno != ESRCH) 770905e8e0e2f0a1f51ab92424dcb005885ea8b2459Denys Vlasenko perror_msg("detach: checking sanity"); 771800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } 772800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko else if (!sigstop_expected && my_tkill(tcp->pid, SIGSTOP) < 0) { 773800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (errno != ESRCH) 774905e8e0e2f0a1f51ab92424dcb005885ea8b2459Denys Vlasenko perror_msg("detach: stopping child"); 775800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } 776800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko else 777800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko sigstop_expected = 1; 778800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } 77910de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 780800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (sigstop_expected) { 781800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko for (;;) { 782800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko#ifdef __WALL 783800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (waitpid(tcp->pid, &status, __WALL) < 0) { 784800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (errno == ECHILD) /* Already gone. */ 785800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko break; 786800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (errno != EINVAL) { 787905e8e0e2f0a1f51ab92424dcb005885ea8b2459Denys Vlasenko perror_msg("detach: waiting"); 788800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko break; 789800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } 790800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko#endif /* __WALL */ 791800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko /* No __WALL here. */ 792800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (waitpid(tcp->pid, &status, 0) < 0) { 793800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (errno != ECHILD) { 794905e8e0e2f0a1f51ab92424dcb005885ea8b2459Denys Vlasenko perror_msg("detach: waiting"); 795800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko break; 796800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } 797800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko#ifdef __WCLONE 798800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko /* If no processes, try clones. */ 799800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (waitpid(tcp->pid, &status, __WCLONE) < 0) { 800800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (errno != ECHILD) 801905e8e0e2f0a1f51ab92424dcb005885ea8b2459Denys Vlasenko perror_msg("detach: waiting"); 802800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko break; 803800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } 804800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko#endif /* __WCLONE */ 805800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } 806800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko#ifdef __WALL 807800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } 808800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko#endif 809800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (!WIFSTOPPED(status)) { 810800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko /* Au revoir, mon ami. */ 811800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko break; 812800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } 813800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (WSTOPSIG(status) == SIGSTOP) { 814800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko ptrace_restart(PTRACE_DETACH, tcp, 0); 815800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko break; 816800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko } 817800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko error = ptrace_restart(PTRACE_CONT, tcp, 818800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko WSTOPSIG(status) == syscall_trap_sig ? 0 819800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko : WSTOPSIG(status)); 820800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (error < 0) 821800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko break; 82210de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin } 82310de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin } 8247dd23384f77e9917bd3173c673f318c5d5b485acDenys Vlasenko 825800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko if (!qflag && (tcp->flags & TCB_ATTACHED)) 826800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko fprintf(stderr, "Process %u detached\n", tcp->pid); 82710de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 828800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko droptcb(tcp); 829800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko 830800ec8ffde1296b3f2cfdd838fb08f2ff2bbe946Denys Vlasenko return error; 83110de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin} 83210de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin 833558e5127fb68a7ab5c5ba6d8e976efd77e396cc2Denys Vlasenkostatic void 834558e5127fb68a7ab5c5ba6d8e976efd77e396cc2Denys Vlasenkoprocess_opt_p_list(char *opt) 835e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko{ 836e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko while (*opt) { 837e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko /* 838e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko * We accept -p PID,PID; -p "`pidof PROG`"; -p "`pgrep PROG`". 839e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko * pidof uses space as delim, pgrep uses newline. :( 840e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko */ 841e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko int pid; 842e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko char *delim = opt + strcspn(opt, ", \n\t"); 843e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko char c = *delim; 844e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko 845e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko *delim = '\0'; 846ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin pid = string_to_uint(opt); 847e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko if (pid <= 0) { 848ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin error_msg_and_die("Invalid process id: '%s'", opt); 849e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko } 850e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko if (pid == strace_tracer_pid) { 851ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin error_msg_and_die("I'm sorry, I can't let you do that, Dave."); 852e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko } 853e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko *delim = c; 8543db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko alloctcb(pid); 855e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko if (c == '\0') 856e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko break; 857e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko opt = delim + 1; 858e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko } 859e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko} 860e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko 86102203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrathstatic void 86202203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrathstartup_attach(void) 86302203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath{ 86402203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath int tcbi; 86502203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath struct tcb *tcp; 86602203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath 86702203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath /* 86802203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath * Block user interruptions as we would leave the traced 86902203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath * process stopped (process state T) if we would terminate in 8702e968c0bb7b89aa43df726eb651f0b51572b4194Denys Vlasenko * between PTRACE_ATTACH and wait4() on SIGSTOP. 871b63256e69bf3f1a74aadb0e14556490bc8f4ef95Denys Vlasenko * We rely on cleanup() from this point on. 87202203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath */ 87302203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath if (interactive) 87402203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath sigprocmask(SIG_BLOCK, &blocked_set, NULL); 87502203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath 876ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko if (daemonized_tracer) { 877ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko pid_t pid = fork(); 878ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko if (pid < 0) { 879014ca3a53cb24d8e12e87f43a880efc52940a8beDenys Vlasenko perror_msg_and_die("fork"); 880ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko } 881ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko if (pid) { /* parent */ 882ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko /* 88375422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko * Wait for grandchild to attach to straced process 88475422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko * (grandparent). Grandchild SIGKILLs us after it attached. 88575422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko * Grandparent's wait() is unblocked by our death, 886ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko * it proceeds to exec the straced program. 887ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko */ 888ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko pause(); 889ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko _exit(0); /* paranoia */ 890ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko } 89175422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko /* grandchild */ 89275422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko /* We will be the tracer process. Remember our new pid: */ 89375422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko strace_tracer_pid = getpid(); 894ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko } 895ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko 89602203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath for (tcbi = 0; tcbi < tcbtabsize; tcbi++) { 89702203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath tcp = tcbtab[tcbi]; 89844f87efc676467ab47972feec49af4f7f34356bfDenys Vlasenko 89975fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko if (!(tcp->flags & TCB_INUSE)) 90075fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko continue; 90175fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko 902d116a7338645af45090aecc331701e999148d284Denys Vlasenko /* Is this a process we should attach to, but not yet attached? */ 90375fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko if (tcp->flags & TCB_ATTACHED) 90475fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko continue; /* no, we already attached it */ 905d116a7338645af45090aecc331701e999148d284Denys Vlasenko 906ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko if (followfork && !daemonized_tracer) { 9077a8bf065802f836901ae886317efcb4ed77cae7bDenys Vlasenko char procdir[sizeof("/proc/%d/task") + sizeof(int) * 3]; 90802203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath DIR *dir; 90902203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath 91002203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath sprintf(procdir, "/proc/%d/task", tcp->pid); 91102203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath dir = opendir(procdir); 91202203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath if (dir != NULL) { 91302203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath unsigned int ntid = 0, nerr = 0; 914c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin struct_dirent *de; 915381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko 916c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin while ((de = read_dir(dir)) != NULL) { 917381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko struct tcb *cur_tcp; 918381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko int tid; 919381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko 9207a8bf065802f836901ae886317efcb4ed77cae7bDenys Vlasenko if (de->d_fileno == 0) 92102203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath continue; 922ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin /* we trust /proc filesystem */ 92302203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath tid = atoi(de->d_name); 92402203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath if (tid <= 0) 92502203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath continue; 92602203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath ++ntid; 92731fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (ptrace_attach_or_seize(tid) < 0) { 92802203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath ++nerr; 929a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko if (debug_flag) 930f95397afb8aadf017b2d3d42056c5929dbf16775Denys Vlasenko fprintf(stderr, "attach to pid %d failed\n", tid); 931381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko continue; 932f95397afb8aadf017b2d3d42056c5929dbf16775Denys Vlasenko } 933a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko if (debug_flag) 934381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko fprintf(stderr, "attach to pid %d succeeded\n", tid); 935381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko cur_tcp = tcp; 936381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko if (tid != tcp->pid) 937381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko cur_tcp = alloctcb(tid); 93831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko cur_tcp->flags |= TCB_ATTACHED | TCB_STARTUP | post_attach_sigstop; 9393db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko newoutf(cur_tcp); 94002203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath } 94102203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath closedir(dir); 942381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko if (interactive) { 943381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko sigprocmask(SIG_SETMASK, &empty_set, NULL); 944381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko if (interrupted) 945381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko goto ret; 946381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko sigprocmask(SIG_BLOCK, &blocked_set, NULL); 947381dbc22929428579f50d9b0b39193feba93dcfdDenys Vlasenko } 9487a8bf065802f836901ae886317efcb4ed77cae7bDenys Vlasenko ntid -= nerr; 9497a8bf065802f836901ae886317efcb4ed77cae7bDenys Vlasenko if (ntid == 0) { 950905e8e0e2f0a1f51ab92424dcb005885ea8b2459Denys Vlasenko perror_msg("attach: ptrace(PTRACE_ATTACH, ...)"); 95102203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath droptcb(tcp); 95202203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath continue; 95302203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath } 95402203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath if (!qflag) { 9557a8bf065802f836901ae886317efcb4ed77cae7bDenys Vlasenko fprintf(stderr, ntid > 1 9563db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko? "Process %u attached with %u threads\n" 9573db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko: "Process %u attached\n", 95844f87efc676467ab47972feec49af4f7f34356bfDenys Vlasenko tcp->pid, ntid); 95902203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath } 96075fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko if (!(tcp->flags & TCB_ATTACHED)) { 961f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko /* -p PID, we failed to attach to PID itself 962f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko * but did attach to some of its sibling threads. 963f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko * Drop PID's tcp. 964f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko */ 965f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko droptcb(tcp); 966f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko } 96702203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath continue; 9687a8bf065802f836901ae886317efcb4ed77cae7bDenys Vlasenko } /* if (opendir worked) */ 9697a8bf065802f836901ae886317efcb4ed77cae7bDenys Vlasenko } /* if (-f) */ 97031fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (ptrace_attach_or_seize(tcp->pid) < 0) { 971905e8e0e2f0a1f51ab92424dcb005885ea8b2459Denys Vlasenko perror_msg("attach: ptrace(PTRACE_ATTACH, ...)"); 97202203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath droptcb(tcp); 97302203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath continue; 97402203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath } 97575fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko tcp->flags |= TCB_ATTACHED | TCB_STARTUP | post_attach_sigstop; 9763db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko newoutf(tcp); 977a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko if (debug_flag) 978f95397afb8aadf017b2d3d42056c5929dbf16775Denys Vlasenko fprintf(stderr, "attach to pid %d (main) succeeded\n", tcp->pid); 979ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko 980ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko if (daemonized_tracer) { 981ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko /* 982ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko * Make parent go away. 983ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko * Also makes grandparent's wait() unblock. 984ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko */ 985ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko kill(getppid(), SIGKILL); 986ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko } 987ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko 98802203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath if (!qflag) 98902203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath fprintf(stderr, 9909c3861d3177f3bfb12b24890fd118bcb77066abbDenys Vlasenko "Process %u attached\n", 99102203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath tcp->pid); 992f95397afb8aadf017b2d3d42056c5929dbf16775Denys Vlasenko } /* for each tcbtab[] */ 99302203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath 99444f87efc676467ab47972feec49af4f7f34356bfDenys Vlasenko ret: 99502203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath if (interactive) 99602203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath sigprocmask(SIG_SETMASK, &empty_set, NULL); 99702203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath} 99802203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath 999f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko/* Stack-o-phobic exec helper, in the hope to work around 1000f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * NOMMU + "daemonized tracer" difficulty. 1001f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko */ 1002f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenkostruct exec_params { 1003f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko int fd_to_close; 1004f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko uid_t run_euid; 1005f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko gid_t run_egid; 1006f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko char **argv; 1007f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko char *pathname; 1008f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko}; 1009f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenkostatic struct exec_params params_for_tracee; 1010f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenkostatic void __attribute__ ((noinline, noreturn)) 1011f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenkoexec_or_die(void) 1012f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko{ 1013f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko struct exec_params *params = ¶ms_for_tracee; 1014f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko 1015f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko if (params->fd_to_close >= 0) 1016f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko close(params->fd_to_close); 1017f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko if (!daemonized_tracer && !use_seize) { 1018f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko if (ptrace(PTRACE_TRACEME, 0L, 0L, 0L) < 0) { 1019f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko perror_msg_and_die("ptrace(PTRACE_TRACEME, ...)"); 1020f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko } 1021f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko } 1022f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko 1023f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko if (username != NULL) { 1024f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko /* 1025f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * It is important to set groups before we 1026f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * lose privileges on setuid. 1027f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko */ 1028f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko if (initgroups(username, run_gid) < 0) { 1029f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko perror_msg_and_die("initgroups"); 1030f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko } 1031f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko if (setregid(run_gid, params->run_egid) < 0) { 1032f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko perror_msg_and_die("setregid"); 1033f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko } 1034f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko if (setreuid(run_uid, params->run_euid) < 0) { 1035f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko perror_msg_and_die("setreuid"); 1036f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko } 1037f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko } 1038f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko else if (geteuid() != 0) 1039f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko if (setreuid(run_uid, run_uid) < 0) { 1040f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko perror_msg_and_die("setreuid"); 1041f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko } 1042f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko 1043f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko if (!daemonized_tracer) { 1044f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko /* 1045f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * Induce a ptrace stop. Tracer (our parent) 1046f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * will resume us with PTRACE_SYSCALL and display 1047f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * the immediately following execve syscall. 1048f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * Can't do this on NOMMU systems, we are after 1049f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * vfork: parent is blocked, stopping would deadlock. 1050f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko */ 1051f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko if (!NOMMU_SYSTEM) 1052f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko kill(getpid(), SIGSTOP); 1053f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko } else { 1054f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko alarm(3); 1055f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko /* we depend on SIGCHLD set to SIG_DFL by init code */ 1056f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko /* if it happens to be SIG_IGN'ed, wait won't block */ 1057f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko wait(NULL); 1058f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko alarm(0); 1059f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko } 1060f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko 1061f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko execv(params->pathname, params->argv); 1062f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko perror_msg_and_die("exec"); 1063f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko} 1064f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko 106502203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrathstatic void 10661201426dd43f5b4e12dfe520e2a9c5027d33dc11Denys Vlasenkostartup_child(char **argv) 106702203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath{ 1068c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin struct_stat statbuf; 106902203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath const char *filename; 107002203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath char pathname[MAXPATHLEN]; 1071f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko int pid; 107202203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath struct tcb *tcp; 107302203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath 107402203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath filename = argv[0]; 107502203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath if (strchr(filename, '/')) { 107602203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath if (strlen(filename) > sizeof pathname - 1) { 107702203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath errno = ENAMETOOLONG; 1078cb2ad00652e746b370703b5470932b7612308b9cDenys Vlasenko perror_msg_and_die("exec"); 107902203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath } 108002203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath strcpy(pathname, filename); 108102203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath } 108202203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath#ifdef USE_DEBUGGING_EXEC 108302203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath /* 108402203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath * Debuggers customarily check the current directory 108502203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath * first regardless of the path but doing that gives 108602203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath * security geeks a panic attack. 108702203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath */ 1088c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin else if (stat_file(filename, &statbuf) == 0) 108902203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath strcpy(pathname, filename); 109002203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath#endif /* USE_DEBUGGING_EXEC */ 109102203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath else { 109230145dda9d7ff70df1d5ad750a183572c73e8963Dmitry V. Levin const char *path; 109302203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath int m, n, len; 109402203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath 109502203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath for (path = getenv("PATH"); path && *path; path += m) { 10964f3df078b26899afe0f25d8651b06a5a5b5143e2Denys Vlasenko const char *colon = strchr(path, ':'); 10974f3df078b26899afe0f25d8651b06a5a5b5143e2Denys Vlasenko if (colon) { 10984f3df078b26899afe0f25d8651b06a5a5b5143e2Denys Vlasenko n = colon - path; 109902203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath m = n + 1; 110002203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath } 110102203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath else 110202203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath m = n = strlen(path); 110302203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath if (n == 0) { 110402203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath if (!getcwd(pathname, MAXPATHLEN)) 110502203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath continue; 110602203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath len = strlen(pathname); 110702203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath } 110802203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath else if (n > sizeof pathname - 1) 110902203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath continue; 111002203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath else { 111102203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath strncpy(pathname, path, n); 111202203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath len = n; 111302203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath } 111402203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath if (len && pathname[len - 1] != '/') 111502203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath pathname[len++] = '/'; 111602203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath strcpy(pathname + len, filename); 1117c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin if (stat_file(pathname, &statbuf) == 0 && 111802203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath /* Accept only regular files 111902203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath with some execute bits set. 112002203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath XXX not perfect, might still fail */ 112102203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath S_ISREG(statbuf.st_mode) && 112202203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath (statbuf.st_mode & 0111)) 112302203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath break; 112402203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath } 112502203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath } 1126c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin if (stat_file(pathname, &statbuf) < 0) { 1127cb2ad00652e746b370703b5470932b7612308b9cDenys Vlasenko perror_msg_and_die("Can't stat '%s'", filename); 112802203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath } 1129f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko 1130f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko params_for_tracee.fd_to_close = (shared_log != stderr) ? fileno(shared_log) : -1; 1131f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko params_for_tracee.run_euid = (statbuf.st_mode & S_ISUID) ? statbuf.st_uid : run_uid; 1132f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko params_for_tracee.run_egid = (statbuf.st_mode & S_ISGID) ? statbuf.st_gid : run_gid; 1133f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko params_for_tracee.argv = argv; 1134f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko /* 1135f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * On NOMMU, can be safely freed only after execve in tracee. 1136f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * It's hard to know when that happens, so we just leak it. 1137f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko */ 113805f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko params_for_tracee.pathname = NOMMU_SYSTEM ? strdup(pathname) : pathname; 1139f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko 1140882478a0724c04287ac232c212312c8e094cce43Dmitry V. Levin#if defined HAVE_PRCTL && defined PR_SET_PTRACER && defined PR_SET_PTRACER_ANY 1141882478a0724c04287ac232c212312c8e094cce43Dmitry V. Levin if (daemonized_tracer) 1142882478a0724c04287ac232c212312c8e094cce43Dmitry V. Levin prctl(PR_SET_PTRACER, PR_SET_PTRACER_ANY); 1143882478a0724c04287ac232c212312c8e094cce43Dmitry V. Levin#endif 1144882478a0724c04287ac232c212312c8e094cce43Dmitry V. Levin 1145a68096576afc07e51d33b49c432d658b27a7f13cDmitry V. Levin strace_child = pid = fork(); 1146ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko if (pid < 0) { 1147cb2ad00652e746b370703b5470932b7612308b9cDenys Vlasenko perror_msg_and_die("fork"); 1148ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko } 1149f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko if ((pid != 0 && daemonized_tracer) 1150f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko || (pid == 0 && !daemonized_tracer) 1151ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko ) { 1152f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko /* We are to become the tracee. Two cases: 1153f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * -D: we are parent 1154f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * not -D: we are child 1155f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko */ 1156f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko exec_or_die(); 115702203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath } 1158ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko 11592e968c0bb7b89aa43df726eb651f0b51572b4194Denys Vlasenko /* We are the tracer */ 116075422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko 11612e968c0bb7b89aa43df726eb651f0b51572b4194Denys Vlasenko if (!daemonized_tracer) { 116231fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (!use_seize) { 116331fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko /* child did PTRACE_TRACEME, nothing to do in parent */ 116431fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } else { 11655c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko if (!NOMMU_SYSTEM) { 116631fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko /* Wait until child stopped itself */ 116731fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko int status; 116831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko while (waitpid(pid, &status, WSTOPPED) < 0) { 116931fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (errno == EINTR) 117031fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko continue; 117131fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko perror_msg_and_die("waitpid"); 117231fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 117331fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (!WIFSTOPPED(status) || WSTOPSIG(status) != SIGSTOP) { 117475fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko kill_save_errno(pid, SIGKILL); 117531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko perror_msg_and_die("Unexpected wait status %x", status); 117631fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 117731fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 11785c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko /* Else: NOMMU case, we have no way to sync. 117931fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko * Just attach to it as soon as possible. 118031fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko * This means that we may miss a few first syscalls... 118131fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko */ 118231fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 118331fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (ptrace_attach_or_seize(pid)) { 118475fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko kill_save_errno(pid, SIGKILL); 118531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko perror_msg_and_die("Can't attach to %d", pid); 118631fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 11875c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko if (!NOMMU_SYSTEM) 118831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko kill(pid, SIGCONT); 118931fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 11902e968c0bb7b89aa43df726eb651f0b51572b4194Denys Vlasenko tcp = alloctcb(pid); 11915c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko if (!NOMMU_SYSTEM) 119275fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko tcp->flags |= TCB_ATTACHED | TCB_STRACE_CHILD | TCB_STARTUP | post_attach_sigstop; 1193f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko else 119475fe85c2ee83a31afe0c8f1468da28deb1c2bc28Denys Vlasenko tcp->flags |= TCB_ATTACHED | TCB_STRACE_CHILD | TCB_STARTUP; 11953db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko newoutf(tcp); 11962e968c0bb7b89aa43df726eb651f0b51572b4194Denys Vlasenko } 11972e968c0bb7b89aa43df726eb651f0b51572b4194Denys Vlasenko else { 119805f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko /* With -D, we are *child* here, IOW: different pid. Fetch it: */ 11992e968c0bb7b89aa43df726eb651f0b51572b4194Denys Vlasenko strace_tracer_pid = getpid(); 12002e968c0bb7b89aa43df726eb651f0b51572b4194Denys Vlasenko /* The tracee is our parent: */ 12012e968c0bb7b89aa43df726eb651f0b51572b4194Denys Vlasenko pid = getppid(); 1202f20250266eb5988805b03b1cc0fa74cdb6398742Denys Vlasenko alloctcb(pid); 1203f20250266eb5988805b03b1cc0fa74cdb6398742Denys Vlasenko /* attaching will be done later, by startup_attach */ 12043db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko /* note: we don't do newoutf(tcp) here either! */ 12055c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko 1206f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko /* NOMMU BUG! -D mode is active, we (child) return, 1207f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * and we will scribble over parent's stack! 1208f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * When parent later unpauses, it segfaults. 1209f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * 1210f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * We work around it 1211f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * (1) by declaring exec_or_die() NORETURN, 1212f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * hopefully compiler will just jump to it 1213f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * instead of call (won't push anything to stack), 1214f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * (2) by trying very hard in exec_or_die() 1215f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * to not use any stack, 1216f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * (3) having a really big (MAXPATHLEN) stack object 1217f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * in this function, which creates a "buffer" between 1218f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * child's and parent's stack pointers. 1219f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * This may save us if (1) and (2) failed 1220f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * and compiler decided to use stack in exec_or_die() anyway 1221f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * (happens on i386 because of stack parameter passing). 122205f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko * 122305f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko * A cleaner solution is to use makecontext + setcontext 122405f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko * to create a genuine separate stack and execute on it. 1225f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko */ 1226ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko } 122702203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath} 122802203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath 1229b13c0de058585de7d47778a8923426b89bfffbb5Wang Chao/* 1230b1467440f7c57c4ba9dc17ab9756e45c84d0adbeDmitry V. Levin * Test whether the kernel support PTRACE_O_TRACECLONE et al options. 1231b13c0de058585de7d47778a8923426b89bfffbb5Wang Chao * First fork a new child, call ptrace with PTRACE_SETOPTIONS on it, 1232b1467440f7c57c4ba9dc17ab9756e45c84d0adbeDmitry V. Levin * and then see which options are supported by the kernel. 1233b13c0de058585de7d47778a8923426b89bfffbb5Wang Chao */ 12348d4ca0c8cd81329ad730ab52b1e0653c1bbea803Denys Vlasenkostatic int 12353454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenkotest_ptrace_setoptions_followfork(void) 1236b13c0de058585de7d47778a8923426b89bfffbb5Wang Chao{ 12372fabd0eaf05379bf121c208ee7a1c129ce1f2f18Dmitry V. Levin int pid, expected_grandchild = 0, found_grandchild = 0; 12382fabd0eaf05379bf121c208ee7a1c129ce1f2f18Dmitry V. Levin const unsigned int test_options = PTRACE_O_TRACECLONE | 12392fabd0eaf05379bf121c208ee7a1c129ce1f2f18Dmitry V. Levin PTRACE_O_TRACEFORK | 12402fabd0eaf05379bf121c208ee7a1c129ce1f2f18Dmitry V. Levin PTRACE_O_TRACEVFORK; 1241b13c0de058585de7d47778a8923426b89bfffbb5Wang Chao 124205f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko /* Need fork for test. NOMMU has no forks */ 124305f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko if (NOMMU_SYSTEM) 124405f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko goto worked; /* be bold, and pretend that test succeeded */ 124505f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko 12465d64581e106f47c474707001f924ee15ef22830bDenys Vlasenko pid = fork(); 12475d64581e106f47c474707001f924ee15ef22830bDenys Vlasenko if (pid < 0) 124804f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin perror_msg_and_die("fork"); 12495d64581e106f47c474707001f924ee15ef22830bDenys Vlasenko if (pid == 0) { 125004f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin pid = getpid(); 125131fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (ptrace(PTRACE_TRACEME, 0L, 0L, 0L) < 0) 125204f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin perror_msg_and_die("%s: PTRACE_TRACEME doesn't work", 125304f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin __func__); 12544c65c44478f1591d96cda425d78451334fe1d401Denys Vlasenko kill_save_errno(pid, SIGSTOP); 125504f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (fork() < 0) 125604f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin perror_msg_and_die("fork"); 125704f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin _exit(0); 1258b13c0de058585de7d47778a8923426b89bfffbb5Wang Chao } 1259b1467440f7c57c4ba9dc17ab9756e45c84d0adbeDmitry V. Levin 1260b1467440f7c57c4ba9dc17ab9756e45c84d0adbeDmitry V. Levin while (1) { 1261b1467440f7c57c4ba9dc17ab9756e45c84d0adbeDmitry V. Levin int status, tracee_pid; 1262b1467440f7c57c4ba9dc17ab9756e45c84d0adbeDmitry V. Levin 126304f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin errno = 0; 1264b1467440f7c57c4ba9dc17ab9756e45c84d0adbeDmitry V. Levin tracee_pid = wait(&status); 126504f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (tracee_pid <= 0) { 1266b1467440f7c57c4ba9dc17ab9756e45c84d0adbeDmitry V. Levin if (errno == EINTR) 1267b1467440f7c57c4ba9dc17ab9756e45c84d0adbeDmitry V. Levin continue; 12684c65c44478f1591d96cda425d78451334fe1d401Denys Vlasenko if (errno == ECHILD) 1269b13c0de058585de7d47778a8923426b89bfffbb5Wang Chao break; 127004f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin kill_save_errno(pid, SIGKILL); 127104f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin perror_msg_and_die("%s: unexpected wait result %d", 127204f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin __func__, tracee_pid); 127304f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin } 127404f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (WIFEXITED(status)) { 127504f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (WEXITSTATUS(status)) { 127604f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (tracee_pid != pid) 127704f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin kill_save_errno(pid, SIGKILL); 127804f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin error_msg_and_die("%s: unexpected exit status %u", 127904f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin __func__, WEXITSTATUS(status)); 128004f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin } 128104f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin continue; 128204f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin } 128304f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (WIFSIGNALED(status)) { 128404f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (tracee_pid != pid) 128504f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin kill_save_errno(pid, SIGKILL); 128604f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin error_msg_and_die("%s: unexpected signal %u", 128704f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin __func__, WTERMSIG(status)); 128804f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin } 128904f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (!WIFSTOPPED(status)) { 129004f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (tracee_pid != pid) 129104f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin kill_save_errno(tracee_pid, SIGKILL); 12924c65c44478f1591d96cda425d78451334fe1d401Denys Vlasenko kill_save_errno(pid, SIGKILL); 129304f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin error_msg_and_die("%s: unexpected wait status %x", 129404f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin __func__, status); 1295b1467440f7c57c4ba9dc17ab9756e45c84d0adbeDmitry V. Levin } 1296b1467440f7c57c4ba9dc17ab9756e45c84d0adbeDmitry V. Levin if (tracee_pid != pid) { 12972fabd0eaf05379bf121c208ee7a1c129ce1f2f18Dmitry V. Levin found_grandchild = tracee_pid; 129804f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (ptrace(PTRACE_CONT, tracee_pid, 0, 0) < 0) { 129904f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin kill_save_errno(tracee_pid, SIGKILL); 130004f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin kill_save_errno(pid, SIGKILL); 130104f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin perror_msg_and_die("PTRACE_CONT doesn't work"); 130204f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin } 130304f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin continue; 1304b1467440f7c57c4ba9dc17ab9756e45c84d0adbeDmitry V. Levin } 130504f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin switch (WSTOPSIG(status)) { 130604f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin case SIGSTOP: 130704f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (ptrace(PTRACE_SETOPTIONS, pid, 0, test_options) < 0 130804f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin && errno != EINVAL && errno != EIO) 130904f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin perror_msg("PTRACE_SETOPTIONS"); 131004f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin break; 131104f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin case SIGTRAP: 131204f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (status >> 16 == PTRACE_EVENT_FORK) { 131304f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin long msg = 0; 13142fabd0eaf05379bf121c208ee7a1c129ce1f2f18Dmitry V. Levin 131504f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (ptrace(PTRACE_GETEVENTMSG, pid, 131604f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin NULL, (long) &msg) == 0) 131704f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin expected_grandchild = msg; 1318b13c0de058585de7d47778a8923426b89bfffbb5Wang Chao } 131904f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin break; 132004f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin } 132104f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (ptrace(PTRACE_SYSCALL, pid, 0, 0) < 0) { 132204f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin kill_save_errno(pid, SIGKILL); 132304f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin perror_msg_and_die("PTRACE_SYSCALL doesn't work"); 1324b13c0de058585de7d47778a8923426b89bfffbb5Wang Chao } 1325b13c0de058585de7d47778a8923426b89bfffbb5Wang Chao } 132604f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (expected_grandchild && expected_grandchild == found_grandchild) { 132705f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko worked: 1328f44cce48bbbd573cc5ae801f69f857433160b03aDenys Vlasenko ptrace_setoptions |= test_options; 1329a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko if (debug_flag) 133004f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin fprintf(stderr, "ptrace_setoptions = %#x\n", 133104f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin ptrace_setoptions); 13328d4ca0c8cd81329ad730ab52b1e0653c1bbea803Denys Vlasenko return 0; 133304f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin } 133404f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin error_msg("Test for PTRACE_O_TRACECLONE failed, " 133504f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin "giving up using this feature."); 13368d4ca0c8cd81329ad730ab52b1e0653c1bbea803Denys Vlasenko return 1; 1337b13c0de058585de7d47778a8923426b89bfffbb5Wang Chao} 13383454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko 13393454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko/* 13403454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * Test whether the kernel support PTRACE_O_TRACESYSGOOD. 13413454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * First fork a new child, call ptrace(PTRACE_SETOPTIONS) on it, 13423454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * and then see whether it will stop with (SIGTRAP | 0x80). 13433454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * 13443454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * Use of this option enables correct handling of user-generated SIGTRAPs, 13453454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * and SIGTRAPs generated by special instructions such as int3 on x86: 13463454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * _start: .globl _start 13473454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * int3 13483454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * movl $42, %ebx 13493454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * movl $1, %eax 13503454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * int $0x80 13513454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * (compile with: "gcc -nostartfiles -nostdlib -o int3 int3.S") 13523454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko */ 13538d4ca0c8cd81329ad730ab52b1e0653c1bbea803Denys Vlasenkostatic int 13543454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenkotest_ptrace_setoptions_for_all(void) 13553454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko{ 135604f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin const unsigned int test_options = PTRACE_O_TRACESYSGOOD | 135704f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin PTRACE_O_TRACEEXEC; 13583454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko int pid; 13593454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko int it_worked = 0; 13603454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko 136105f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko /* Need fork for test. NOMMU has no forks */ 13625c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko if (NOMMU_SYSTEM) 136305f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko goto worked; /* be bold, and pretend that test succeeded */ 13647ff5ed932568a8049c3ca134da374f64c3e255ceMike Frysinger 13653454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko pid = fork(); 13663454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko if (pid < 0) 136775422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko perror_msg_and_die("fork"); 13683454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko 13693454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko if (pid == 0) { 13703454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko pid = getpid(); 13713454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko if (ptrace(PTRACE_TRACEME, 0L, 0L, 0L) < 0) 137275422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko /* Note: exits with exitcode 1 */ 137304f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin perror_msg_and_die("%s: PTRACE_TRACEME doesn't work", 137404f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin __func__); 13753454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko kill(pid, SIGSTOP); 13763454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko _exit(0); /* parent should see entry into this syscall */ 13773454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko } 13783454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko 13793454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko while (1) { 13803454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko int status, tracee_pid; 13813454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko 13823454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko errno = 0; 13833454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko tracee_pid = wait(&status); 13843454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko if (tracee_pid <= 0) { 13853454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko if (errno == EINTR) 13863454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko continue; 138704f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin kill_save_errno(pid, SIGKILL); 138804f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin perror_msg_and_die("%s: unexpected wait result %d", 138904f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin __func__, tracee_pid); 139075422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko } 139175422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko if (WIFEXITED(status)) { 139275422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko if (WEXITSTATUS(status) == 0) 139375422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko break; 139404f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin error_msg_and_die("%s: unexpected exit status %u", 139504f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin __func__, WEXITSTATUS(status)); 139604f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin } 139704f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (WIFSIGNALED(status)) { 139804f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin error_msg_and_die("%s: unexpected signal %u", 139904f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin __func__, WTERMSIG(status)); 14003454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko } 14013454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko if (!WIFSTOPPED(status)) { 14023454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko kill(pid, SIGKILL); 140304f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin error_msg_and_die("%s: unexpected wait status %x", 140404f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin __func__, status); 14053454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko } 14063454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko if (WSTOPSIG(status) == SIGSTOP) { 14073454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko /* 14083454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * We don't check "options aren't accepted" error. 14093454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * If it happens, we'll never get (SIGTRAP | 0x80), 14103454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * and thus will decide to not use the option. 14113454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko * IOW: the outcome of the test will be correct. 14123454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko */ 141304f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (ptrace(PTRACE_SETOPTIONS, pid, 0L, test_options) < 0 141404f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin && errno != EINVAL && errno != EIO) 141504f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin perror_msg("PTRACE_SETOPTIONS"); 14163454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko } 14173454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko if (WSTOPSIG(status) == (SIGTRAP | 0x80)) { 14183454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko it_worked = 1; 14193454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko } 14203454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko if (ptrace(PTRACE_SYSCALL, pid, 0L, 0L) < 0) { 142104f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin kill_save_errno(pid, SIGKILL); 142275422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko perror_msg_and_die("PTRACE_SYSCALL doesn't work"); 14233454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko } 14243454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko } 14253454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko 14263454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko if (it_worked) { 142705f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko worked: 142875422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko syscall_trap_sig = (SIGTRAP | 0x80); 1429f44cce48bbbd573cc5ae801f69f857433160b03aDenys Vlasenko ptrace_setoptions |= test_options; 1430a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko if (debug_flag) 1431f44cce48bbbd573cc5ae801f69f857433160b03aDenys Vlasenko fprintf(stderr, "ptrace_setoptions = %#x\n", 1432f44cce48bbbd573cc5ae801f69f857433160b03aDenys Vlasenko ptrace_setoptions); 14338d4ca0c8cd81329ad730ab52b1e0653c1bbea803Denys Vlasenko return 0; 14343454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko } 14353454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko 143604f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin error_msg("Test for PTRACE_O_TRACESYSGOOD failed, " 143704f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin "giving up using this feature."); 14388d4ca0c8cd81329ad730ab52b1e0653c1bbea803Denys Vlasenko return 1; 14393454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko} 144031fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 14415c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko#if USE_SEIZE 144231fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenkostatic void 144331fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenkotest_ptrace_seize(void) 144431fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko{ 144531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko int pid; 144631fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 144705f325199a6cf36c92560d5a08b56652502705c2Denys Vlasenko /* Need fork for test. NOMMU has no forks */ 14485c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko if (NOMMU_SYSTEM) { 14495c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko post_attach_sigstop = 0; /* this sets use_seize to 1 */ 14505c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko return; 14515c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko } 14525c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko 145331fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko pid = fork(); 145431fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (pid < 0) 145531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko perror_msg_and_die("fork"); 145631fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 145731fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (pid == 0) { 145831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko pause(); 145931fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko _exit(0); 146031fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 146131fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 146231fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko /* PTRACE_SEIZE, unlike ATTACH, doesn't force tracee to trap. After 146331fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko * attaching tracee continues to run unless a trap condition occurs. 146431fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko * PTRACE_SEIZE doesn't affect signal or group stop state. 146531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko */ 146626bc0606d96d05d30ba263939a0451889340a64cDenys Vlasenko if (ptrace(PTRACE_SEIZE, pid, 0, 0) == 0) { 146731fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko post_attach_sigstop = 0; /* this sets use_seize to 1 */ 1468a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko } else if (debug_flag) { 146931fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko fprintf(stderr, "PTRACE_SEIZE doesn't work\n"); 147031fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 147131fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 147231fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko kill(pid, SIGKILL); 147331fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 147431fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko while (1) { 147531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko int status, tracee_pid; 147631fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 147731fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko errno = 0; 147831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko tracee_pid = waitpid(pid, &status, 0); 147931fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (tracee_pid <= 0) { 148031fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (errno == EINTR) 148131fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko continue; 148231fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko perror_msg_and_die("%s: unexpected wait result %d", 148331fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko __func__, tracee_pid); 148431fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 148531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (WIFSIGNALED(status)) { 148631fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko return; 148731fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 148831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko error_msg_and_die("%s: unexpected wait status %x", 148931fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko __func__, status); 149031fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 149131fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko} 1492978fbc901c4fe260caaa5881e54bd9cb54022101Denys Vlasenko#else /* !USE_SEIZE */ 1493978fbc901c4fe260caaa5881e54bd9cb54022101Denys Vlasenko# define test_ptrace_seize() ((void)0) 1494978fbc901c4fe260caaa5881e54bd9cb54022101Denys Vlasenko#endif 149531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 14966e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenkostatic unsigned 1497f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenkoget_os_release(void) 1498f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko{ 14996e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko unsigned rel; 15006e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko const char *p; 1501f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko struct utsname u; 1502f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko if (uname(&u) < 0) 1503f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko perror_msg_and_die("uname"); 15046e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko /* u.release has this form: "3.2.9[-some-garbage]" */ 15056e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko rel = 0; 15066e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko p = u.release; 15076e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko for (;;) { 15086e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko if (!(*p >= '0' && *p <= '9')) 15096e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko error_msg_and_die("Bad OS release string: '%s'", u.release); 15106e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko /* Note: this open-codes KERNEL_VERSION(): */ 15116e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko rel = (rel << 8) | atoi(p); 15126e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko if (rel >= KERNEL_VERSION(1,0,0)) 15136e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko break; 15146e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko while (*p >= '0' && *p <= '9') 15156e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko p++; 15160dbc80de895c25769791b7726022a274695eec31Dmitry V. Levin if (*p != '.') { 15170dbc80de895c25769791b7726022a274695eec31Dmitry V. Levin if (rel >= KERNEL_VERSION(0,1,0)) { 15180dbc80de895c25769791b7726022a274695eec31Dmitry V. Levin /* "X.Y-something" means "X.Y.0" */ 15190dbc80de895c25769791b7726022a274695eec31Dmitry V. Levin rel <<= 8; 15200dbc80de895c25769791b7726022a274695eec31Dmitry V. Levin break; 15210dbc80de895c25769791b7726022a274695eec31Dmitry V. Levin } 15226e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko error_msg_and_die("Bad OS release string: '%s'", u.release); 15230dbc80de895c25769791b7726022a274695eec31Dmitry V. Levin } 15246e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko p++; 15256e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko } 15266e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko return rel; 1527f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko} 1528f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko 1529ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko/* 1530ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko * Initialization part of main() was eating much stack (~0.5k), 1531ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko * which was unused after init. 1532ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko * We can reuse it if we move init code into a separate function. 1533ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko * 1534ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko * Don't want main() to inline us and defeat the reason 1535ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko * we have a separate function. 1536ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko */ 1537ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenkostatic void __attribute__ ((noinline)) 1538ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenkoinit(int argc, char *argv[]) 153976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman{ 154076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman struct tcb *tcp; 1541ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin int c, i; 154206350dba7505eda4b8220cca8a9b112504fafc4dDmitry V. Levin int optF = 0; 154376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman struct sigaction sa; 154476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 154508b623eb84266d4a2defc619fa78400c4e4f0dc1Dmitry V. Levin progname = argv[0] ? argv[0] : "strace"; 154608b623eb84266d4a2defc619fa78400c4e4f0dc1Dmitry V. Levin 1547a509054aeee00a89a2250919f74bd849c67ded61Denys Vlasenko /* Make sure SIGCHLD has the default action so that waitpid 1548a509054aeee00a89a2250919f74bd849c67ded61Denys Vlasenko definitely works without losing track of children. The user 1549a509054aeee00a89a2250919f74bd849c67ded61Denys Vlasenko should not have given us a bogus state to inherit, but he might 1550a509054aeee00a89a2250919f74bd849c67ded61Denys Vlasenko have. Arguably we should detect SIG_IGN here and pass it on 1551a509054aeee00a89a2250919f74bd849c67ded61Denys Vlasenko to children, but probably noone really needs that. */ 1552a509054aeee00a89a2250919f74bd849c67ded61Denys Vlasenko signal(SIGCHLD, SIG_DFL); 1553a509054aeee00a89a2250919f74bd849c67ded61Denys Vlasenko 155475422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko strace_tracer_pid = getpid(); 155575422766d51cf96ea081977c9d0b26b2ba1a8adeDenys Vlasenko 15566e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko os_release = get_os_release(); 1557f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko 1558ee9d435275fd7abf736992f84b5053ee16ec4fc7Roland McGrath /* Allocate the initial tcbtab. */ 1559ee9d435275fd7abf736992f84b5053ee16ec4fc7Roland McGrath tcbtabsize = argc; /* Surely enough for all -p args. */ 15604f12af24e4c1d4e44b84ba6d5e72e6d8b6490e35Denys Vlasenko tcbtab = calloc(tcbtabsize, sizeof(tcbtab[0])); 15611d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko if (!tcbtab) 15621d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko die_out_of_memory(); 15634f12af24e4c1d4e44b84ba6d5e72e6d8b6490e35Denys Vlasenko tcp = calloc(tcbtabsize, sizeof(*tcp)); 15641d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko if (!tcp) 15651d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko die_out_of_memory(); 15664f12af24e4c1d4e44b84ba6d5e72e6d8b6490e35Denys Vlasenko for (c = 0; c < tcbtabsize; c++) 15674f12af24e4c1d4e44b84ba6d5e72e6d8b6490e35Denys Vlasenko tcbtab[c] = tcp++; 1568ee9d435275fd7abf736992f84b5053ee16ec4fc7Roland McGrath 15696764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko shared_log = stderr; 1570138c6a334fd9949d6147c63ada02cf55472e02c0Roland McGrath set_sortby(DEFAULT_SORTBY); 1571138c6a334fd9949d6147c63ada02cf55472e02c0Roland McGrath set_personality(DEFAULT_PERSONALITY); 157276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman qualify("trace=all"); 157376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman qualify("abbrev=all"); 157476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman qualify("verbose=all"); 157574ec14f968a418691b851cbbfeb0269174c64b08Denys Vlasenko#if DEFAULT_QUAL_FLAGS != (QUAL_TRACE | QUAL_ABBREV | QUAL_VERBOSE) 157674ec14f968a418691b851cbbfeb0269174c64b08Denys Vlasenko# error Bug in DEFAULT_QUAL_FLAGS 157774ec14f968a418691b851cbbfeb0269174c64b08Denys Vlasenko#endif 157876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman qualify("signal=all"); 157976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman while ((c = getopt(argc, argv, 158022efaf0028ddec8f9ed2a2a11e9baaa201594a33Denys Vlasenko "+b:cCdfFhiqrtTvVxyz" 1581ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko "D" 1582b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko "a:e:o:O:p:s:S:u:E:P:I:")) != EOF) { 158376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman switch (c) { 158461e7aad9fa1a6a5bd5a586e6276767caf12b53f2Denys Vlasenko case 'b': 158522efaf0028ddec8f9ed2a2a11e9baaa201594a33Denys Vlasenko if (strcmp(optarg, "execve") != 0) 158622efaf0028ddec8f9ed2a2a11e9baaa201594a33Denys Vlasenko error_msg_and_die("Syscall '%s' for -b isn't supported", 158722efaf0028ddec8f9ed2a2a11e9baaa201594a33Denys Vlasenko optarg); 158861e7aad9fa1a6a5bd5a586e6276767caf12b53f2Denys Vlasenko detach_on_execve = 1; 158961e7aad9fa1a6a5bd5a586e6276767caf12b53f2Denys Vlasenko break; 159076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'c': 1591e3a7ef5a2a3ac31bfa0d3f9ce65981e51700073eDmitry V. Levin if (cflag == CFLAG_BOTH) { 1592c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko error_msg_and_die("-c and -C are mutually exclusive"); 1593e3a7ef5a2a3ac31bfa0d3f9ce65981e51700073eDmitry V. Levin } 1594e3a7ef5a2a3ac31bfa0d3f9ce65981e51700073eDmitry V. Levin cflag = CFLAG_ONLY_STATS; 1595e3a7ef5a2a3ac31bfa0d3f9ce65981e51700073eDmitry V. Levin break; 1596e3a7ef5a2a3ac31bfa0d3f9ce65981e51700073eDmitry V. Levin case 'C': 1597e3a7ef5a2a3ac31bfa0d3f9ce65981e51700073eDmitry V. Levin if (cflag == CFLAG_ONLY_STATS) { 1598c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko error_msg_and_die("-c and -C are mutually exclusive"); 1599e3a7ef5a2a3ac31bfa0d3f9ce65981e51700073eDmitry V. Levin } 1600e3a7ef5a2a3ac31bfa0d3f9ce65981e51700073eDmitry V. Levin cflag = CFLAG_BOTH; 160176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 160276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'd': 1603a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko debug_flag = 1; 160476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 1605ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko case 'D': 1606ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko daemonized_tracer = 1; 1607ecfe2f19f963b5c2f176c5e70d42654d7429ce3eDenys Vlasenko break; 160841c48227a86a176da333f713d5047240885f25ccRoland McGrath case 'F': 160906350dba7505eda4b8220cca8a9b112504fafc4dDmitry V. Levin optF = 1; 161006350dba7505eda4b8220cca8a9b112504fafc4dDmitry V. Levin break; 161176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'f': 161276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman followfork++; 161376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 161476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'h': 161576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman usage(stdout, 0); 161676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 161776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'i': 1618a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko iflag = 1; 161976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 162076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'q': 162101997cf32d4492b9898283ced45e8a4a6fd161b8Daniel P. Berrange qflag++; 162276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 162376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'r': 1624a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko rflag = 1; 1625a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko /* fall through to tflag++ */ 162676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 't': 162776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman tflag++; 162876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 162976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'T': 1630a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko Tflag = 1; 163176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 163276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'x': 163376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman xflag++; 163476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 16358a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards case 'y': 16368a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards show_fd_path = 1; 16378a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards break; 163876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'v': 163976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman qualify("abbrev=none"); 164076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 164176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'V': 16429c9a2534e361b683f1e4e08804b7166a01475bf1Roland McGrath printf("%s -- version %s\n", PACKAGE_NAME, VERSION); 164376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman exit(0); 164476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 164517f8fb3484e94976882f65b7a3aaffc6f24cd75dMichal Ludvig case 'z': 164617f8fb3484e94976882f65b7a3aaffc6f24cd75dMichal Ludvig not_failing_only = 1; 164717f8fb3484e94976882f65b7a3aaffc6f24cd75dMichal Ludvig break; 164876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'a': 1649ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin acolumn = string_to_uint(optarg); 1650102ec4935440ff52a7fa3566154a84cc2473f16aDenys Vlasenko if (acolumn < 0) 1651ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin error_opt_arg(c, optarg); 165276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 165376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'e': 165476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman qualify(optarg); 165576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 165676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'o': 165776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman outfname = strdup(optarg); 165876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 165976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'O': 1660ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin i = string_to_uint(optarg); 1661ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin if (i < 0) 1662ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin error_opt_arg(c, optarg); 1663ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin set_overhead(i); 166476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 166576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'p': 1666e8172b79e3dd35a136f4dc4d4de9df5bb4565c01Denys Vlasenko process_opt_p_list(optarg); 166776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 16688a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards case 'P': 16697239dbcf2dff792f408c60fe3e278f707fdf497bDenys Vlasenko pathtrace_select(optarg); 16708a08277d13d0378c2ff3ce851534c3bf7e31defaGrant Edwards break; 167176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 's': 1672ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin i = string_to_uint(optarg); 1673ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin if (i < 0) 1674ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin error_opt_arg(c, optarg); 1675ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin max_strlen = i; 167676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 167776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'S': 167876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman set_sortby(optarg); 167976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 168076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman case 'u': 168176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman username = strdup(optarg); 168276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 1683de6e53308ca58da7d357f8114afc74fff7a18043Roland McGrath case 'E': 16841d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko if (putenv(optarg) < 0) 16851d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko die_out_of_memory(); 1686de6e53308ca58da7d357f8114afc74fff7a18043Roland McGrath break; 1687b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko case 'I': 1688ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin opt_intr = string_to_uint(optarg); 1689ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin if (opt_intr <= 0 || opt_intr >= NUM_INTR_OPTS) 1690ccee169ab6aa4ae7515198dadcef5dd2286ede4bDmitry V. Levin error_opt_arg(c, optarg); 1691b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko break; 169276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman default: 169376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman usage(stderr, 1); 169476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman break; 169576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 169676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 1697837399af4ffefec55f9693022dc6d8608da442cfDenys Vlasenko argv += optind; 1698837399af4ffefec55f9693022dc6d8608da442cfDenys Vlasenko /* argc -= optind; - no need, argc is not used below */ 169976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 1700102ec4935440ff52a7fa3566154a84cc2473f16aDenys Vlasenko acolumn_spaces = malloc(acolumn + 1); 1701102ec4935440ff52a7fa3566154a84cc2473f16aDenys Vlasenko if (!acolumn_spaces) 17021d46ba57a8ab16b353b531f2bbefe2ad7f354ca9Denys Vlasenko die_out_of_memory(); 1703102ec4935440ff52a7fa3566154a84cc2473f16aDenys Vlasenko memset(acolumn_spaces, ' ', acolumn); 1704102ec4935440ff52a7fa3566154a84cc2473f16aDenys Vlasenko acolumn_spaces[acolumn] = '\0'; 1705102ec4935440ff52a7fa3566154a84cc2473f16aDenys Vlasenko 1706837399af4ffefec55f9693022dc6d8608da442cfDenys Vlasenko /* Must have PROG [ARGS], or -p PID. Not both. */ 1707fd883380671693a4616881a9103491f9e67fc8aeDenys Vlasenko if (!argv[0] == !nprocs) 1708ce0d15442eec017b1dcbfdd14ac92e73c39c586aRoland McGrath usage(stderr, 1); 1709ce0d15442eec017b1dcbfdd14ac92e73c39c586aRoland McGrath 1710fd883380671693a4616881a9103491f9e67fc8aeDenys Vlasenko if (nprocs != 0 && daemonized_tracer) { 1711c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko error_msg_and_die("-D and -p are mutually exclusive"); 1712d322a4bbe118642c4c9b170451a601a1e80b72d6Wang Chao } 1713d322a4bbe118642c4c9b170451a601a1e80b72d6Wang Chao 171406350dba7505eda4b8220cca8a9b112504fafc4dDmitry V. Levin if (!followfork) 171506350dba7505eda4b8220cca8a9b112504fafc4dDmitry V. Levin followfork = optF; 171606350dba7505eda4b8220cca8a9b112504fafc4dDmitry V. Levin 17173db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko if (followfork >= 2 && cflag) { 1718c5ccfa450b9818ef9eab94f9d15189e50a796937Denys Vlasenko error_msg_and_die("(-c or -C) and -ff are mutually exclusive"); 1719cb9def6975f28933ada9d35f05c6fba9ab3fe1fdRoland McGrath } 1720cb9def6975f28933ada9d35f05c6fba9ab3fe1fdRoland McGrath 172176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman /* See if they want to run as another user. */ 172276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman if (username != NULL) { 172376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman struct passwd *pent; 172476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 172576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman if (getuid() != 0 || geteuid() != 0) { 1726cb2ad00652e746b370703b5470932b7612308b9cDenys Vlasenko error_msg_and_die("You must be root to use the -u option"); 172776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 17285d64581e106f47c474707001f924ee15ef22830bDenys Vlasenko pent = getpwnam(username); 17295d64581e106f47c474707001f924ee15ef22830bDenys Vlasenko if (pent == NULL) { 1730cb2ad00652e746b370703b5470932b7612308b9cDenys Vlasenko error_msg_and_die("Cannot find user '%s'", username); 173176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 173276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman run_uid = pent->pw_uid; 173376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman run_gid = pent->pw_gid; 173476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 173576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman else { 173676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman run_uid = getuid(); 173776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman run_gid = getgid(); 173876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 173976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 17408d4ca0c8cd81329ad730ab52b1e0653c1bbea803Denys Vlasenko /* 17418d4ca0c8cd81329ad730ab52b1e0653c1bbea803Denys Vlasenko * On any reasonably recent Linux kernel (circa about 2.5.46) 17428d4ca0c8cd81329ad730ab52b1e0653c1bbea803Denys Vlasenko * need_fork_exec_workarounds should stay 0 after these tests: 17438d4ca0c8cd81329ad730ab52b1e0653c1bbea803Denys Vlasenko */ 17448d4ca0c8cd81329ad730ab52b1e0653c1bbea803Denys Vlasenko /*need_fork_exec_workarounds = 0; - already is */ 174504f8b4860f12512186481ca21dbd311d9d612326Dmitry V. Levin if (followfork) 17468d4ca0c8cd81329ad730ab52b1e0653c1bbea803Denys Vlasenko need_fork_exec_workarounds = test_ptrace_setoptions_followfork(); 17478d4ca0c8cd81329ad730ab52b1e0653c1bbea803Denys Vlasenko need_fork_exec_workarounds |= test_ptrace_setoptions_for_all(); 174831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko test_ptrace_seize(); 17498044bc1463f62ae5f974cc531576bc18dade0337Dmitry V. Levin 175076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman /* Check if they want to redirect the output. */ 175176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman if (outfname) { 175237b9a66dd4cf063c4a3d1002f4196cd7ef9ae5b7Roland McGrath /* See if they want to pipe the output. */ 175337b9a66dd4cf063c4a3d1002f4196cd7ef9ae5b7Roland McGrath if (outfname[0] == '|' || outfname[0] == '!') { 175437b9a66dd4cf063c4a3d1002f4196cd7ef9ae5b7Roland McGrath /* 175537b9a66dd4cf063c4a3d1002f4196cd7ef9ae5b7Roland McGrath * We can't do the <outfname>.PID funny business 175637b9a66dd4cf063c4a3d1002f4196cd7ef9ae5b7Roland McGrath * when using popen, so prohibit it. 175737b9a66dd4cf063c4a3d1002f4196cd7ef9ae5b7Roland McGrath */ 17583db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko if (followfork >= 2) 17597dd23384f77e9917bd3173c673f318c5d5b485acDenys Vlasenko error_msg_and_die("Piping the output and -ff are mutually exclusive"); 17606764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko shared_log = strace_popen(outfname + 1); 176154b4f79216c819ec93aaf5031acb1772fccef7a9Wichert Akkerman } 17623db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko else if (followfork < 2) 17636764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko shared_log = strace_fopen(outfname); 1764328bf250bde8167cec6f2f5bf35463fb4ffb6f9fDenys Vlasenko } else { 1765328bf250bde8167cec6f2f5bf35463fb4ffb6f9fDenys Vlasenko /* -ff without -o FILE is the same as single -f */ 17663db3b26101443dccbea959ba0abcbffb240d04e8Denys Vlasenko if (followfork >= 2) 1767328bf250bde8167cec6f2f5bf35463fb4ffb6f9fDenys Vlasenko followfork = 1; 176876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 176976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 1770cb2ad00652e746b370703b5470932b7612308b9cDenys Vlasenko if (!outfname || outfname[0] == '|' || outfname[0] == '!') { 1771a677da5e3f25107d4402c1c917d019f2d0bc9f29Denys Vlasenko char *buf = malloc(BUFSIZ); 1772a677da5e3f25107d4402c1c917d019f2d0bc9f29Denys Vlasenko if (!buf) 1773a677da5e3f25107d4402c1c917d019f2d0bc9f29Denys Vlasenko die_out_of_memory(); 17746764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko setvbuf(shared_log, buf, _IOLBF, BUFSIZ); 1775cb2ad00652e746b370703b5470932b7612308b9cDenys Vlasenko } 1776837399af4ffefec55f9693022dc6d8608da442cfDenys Vlasenko if (outfname && argv[0]) { 1777b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko if (!opt_intr) 1778b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko opt_intr = INTR_NEVER; 177976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman qflag = 1; 1780369310502bfca4b202d72be9452c8cdb55bb6d5eRoland McGrath } 1781b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko if (!opt_intr) 1782b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko opt_intr = INTR_WHILE_WAIT; 1783b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko 1784b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko /* argv[0] -pPID -oFILE Default interactive setting 1785b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko * yes 0 0 INTR_WHILE_WAIT 1786b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko * no 1 0 INTR_WHILE_WAIT 1787b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko * yes 0 1 INTR_NEVER 1788b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko * no 1 1 INTR_WHILE_WAIT 178954cc1c8ae2d097502439a95d43e1f0ed6782d38cRoland McGrath */ 179054cc1c8ae2d097502439a95d43e1f0ed6782d38cRoland McGrath 17915c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko sigemptyset(&empty_set); 17925c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko sigemptyset(&blocked_set); 17935c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko 1794f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko /* startup_child() must be called before the signal handlers get 1795f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * installed below as they are inherited into the spawned process. 1796f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * Also we do not need to be protected by them as during interruption 1797f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko * in the startup_child() mode we kill the spawned process anyway. 1798f909c8d0d759d0511ad2c741854602b0494e0390Denys Vlasenko */ 179961e7aad9fa1a6a5bd5a586e6276767caf12b53f2Denys Vlasenko if (argv[0]) { 18001d2435b20bc81fb52c3edb19a3b6247ce2d43ca6Dmitry V. Levin if (!NOMMU_SYSTEM || daemonized_tracer) 18011d2435b20bc81fb52c3edb19a3b6247ce2d43ca6Dmitry V. Levin hide_log_until_execve = 1; 18022a3d27552f17a5b378344620bec7d255bac65a8dDenys Vlasenko skip_one_b_execve = 1; 1803837399af4ffefec55f9693022dc6d8608da442cfDenys Vlasenko startup_child(argv); 180461e7aad9fa1a6a5bd5a586e6276767caf12b53f2Denys Vlasenko } 180576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 180676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman sa.sa_handler = SIG_IGN; 180776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman sigemptyset(&sa.sa_mask); 180876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman sa.sa_flags = 0; 1809b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sigaction(SIGTTOU, &sa, NULL); /* SIG_IGN */ 1810b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sigaction(SIGTTIN, &sa, NULL); /* SIG_IGN */ 1811b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko if (opt_intr != INTR_ANYWHERE) { 1812b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko if (opt_intr == INTR_BLOCK_TSTP_TOO) 1813b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sigaction(SIGTSTP, &sa, NULL); /* SIG_IGN */ 1814b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko /* 1815b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko * In interactive mode (if no -o OUTFILE, or -p PID is used), 1816b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko * fatal signals are blocked while syscall stop is processed, 1817b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko * and acted on in between, when waiting for new syscall stops. 1818b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko * In non-interactive mode, signals are ignored. 1819b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko */ 1820b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko if (opt_intr == INTR_WHILE_WAIT) { 1821b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sigaddset(&blocked_set, SIGHUP); 1822b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sigaddset(&blocked_set, SIGINT); 1823b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sigaddset(&blocked_set, SIGQUIT); 1824b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sigaddset(&blocked_set, SIGPIPE); 1825b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sigaddset(&blocked_set, SIGTERM); 1826b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sa.sa_handler = interrupt; 1827b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko } 1828b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko /* SIG_IGN, or set handler for these */ 1829b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sigaction(SIGHUP, &sa, NULL); 1830b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sigaction(SIGINT, &sa, NULL); 1831b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sigaction(SIGQUIT, &sa, NULL); 1832b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sigaction(SIGPIPE, &sa, NULL); 1833b51581e8f0b11d8f1cce055cebb287f728a508a3Denys Vlasenko sigaction(SIGTERM, &sa, NULL); 183476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 1835fd883380671693a4616881a9103491f9e67fc8aeDenys Vlasenko if (nprocs != 0 || daemonized_tracer) 183602203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath startup_attach(); 183702203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath 1838fd883380671693a4616881a9103491f9e67fc8aeDenys Vlasenko /* Do we want pids printed in our -o OUTFILE? 1839fd883380671693a4616881a9103491f9e67fc8aeDenys Vlasenko * -ff: no (every pid has its own file); or 1840fd883380671693a4616881a9103491f9e67fc8aeDenys Vlasenko * -f: yes (there can be more pids in the future); or 1841fd883380671693a4616881a9103491f9e67fc8aeDenys Vlasenko * -p PID1,PID2: yes (there are already more than one pid) 1842fd883380671693a4616881a9103491f9e67fc8aeDenys Vlasenko */ 1843fd883380671693a4616881a9103491f9e67fc8aeDenys Vlasenko print_pid_pfx = (outfname && followfork < 2 && (followfork == 1 || nprocs > 1)); 184476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman} 184576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 1846eebb04d4ae8bf4b08a041f5ea442ca24c90692c2Denys Vlasenkostatic struct tcb * 184754e931fb858410644f61885b4b36fc20320e1fc6Roland McGrathpid2tcb(int pid) 184876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman{ 184976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman int i; 185054e931fb858410644f61885b4b36fc20320e1fc6Roland McGrath 185154e931fb858410644f61885b4b36fc20320e1fc6Roland McGrath if (pid <= 0) 185254e931fb858410644f61885b4b36fc20320e1fc6Roland McGrath return NULL; 185376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 1854ee9d435275fd7abf736992f84b5053ee16ec4fc7Roland McGrath for (i = 0; i < tcbtabsize; i++) { 185554e931fb858410644f61885b4b36fc20320e1fc6Roland McGrath struct tcb *tcp = tcbtab[i]; 185654e931fb858410644f61885b4b36fc20320e1fc6Roland McGrath if (tcp->pid == pid && (tcp->flags & TCB_INUSE)) 185776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman return tcp; 185876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 185954e931fb858410644f61885b4b36fc20320e1fc6Roland McGrath 186076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman return NULL; 186176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman} 186276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 186376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkermanstatic void 18641201426dd43f5b4e12dfe520e2a9c5027d33dc11Denys Vlasenkocleanup(void) 186576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman{ 186676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman int i; 186776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman struct tcb *tcp; 18683521884c91d0bbd8e796d72619da40bdad95789cDenys Vlasenko int fatal_sig; 18693521884c91d0bbd8e796d72619da40bdad95789cDenys Vlasenko 18703521884c91d0bbd8e796d72619da40bdad95789cDenys Vlasenko /* 'interrupted' is a volatile object, fetch it only once */ 18713521884c91d0bbd8e796d72619da40bdad95789cDenys Vlasenko fatal_sig = interrupted; 18723521884c91d0bbd8e796d72619da40bdad95789cDenys Vlasenko if (!fatal_sig) 18733521884c91d0bbd8e796d72619da40bdad95789cDenys Vlasenko fatal_sig = SIGTERM; 187476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 1875ee9d435275fd7abf736992f84b5053ee16ec4fc7Roland McGrath for (i = 0; i < tcbtabsize; i++) { 1876ee9d435275fd7abf736992f84b5053ee16ec4fc7Roland McGrath tcp = tcbtab[i]; 187776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman if (!(tcp->flags & TCB_INUSE)) 187876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman continue; 1879a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko if (debug_flag) 188076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman fprintf(stderr, 188176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman "cleanup: looking at pid %u\n", tcp->pid); 18827de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko if (tcp->flags & TCB_STRACE_CHILD) { 188376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman kill(tcp->pid, SIGCONT); 1884a3559250d48ccc3ef755183ebb3246cbbb442c0dDenys Vlasenko kill(tcp->pid, fatal_sig); 188576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 18867de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko detach(tcp); 188776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 188876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman if (cflag) 18896764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko call_summary(shared_log); 189076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman} 189176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 189276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkermanstatic void 18931201426dd43f5b4e12dfe520e2a9c5027d33dc11Denys Vlasenkointerrupt(int sig) 189476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman{ 1895a3559250d48ccc3ef755183ebb3246cbbb442c0dDenys Vlasenko interrupted = sig; 189676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman} 189776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 189876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkermanstatic int 18991201426dd43f5b4e12dfe520e2a9c5027d33dc11Denys Vlasenkotrace(void) 190076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman{ 190176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman struct rusage ru; 190226d1b1eaa861ec33d2c671acc9c0ccb867042cb8Denys Vlasenko struct rusage *rup = cflag ? &ru : NULL; 1903978fbc901c4fe260caaa5881e54bd9cb54022101Denys Vlasenko#ifdef __WALL 1904eb9e2e8904ce85a6c7390be25bb873c6db88c4d3Roland McGrath static int wait4_options = __WALL; 1905978fbc901c4fe260caaa5881e54bd9cb54022101Denys Vlasenko#endif 190676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 1907eb9e2e8904ce85a6c7390be25bb873c6db88c4d3Roland McGrath while (nprocs != 0) { 1908f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko int pid; 1909f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko int wait_errno; 1910f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko int status, sig; 191131fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko int stopped; 1912f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko struct tcb *tcp; 1913f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko unsigned event; 1914f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko 1915222713aa409c5caa47327a084f1083a7d6fee66fDenys Vlasenko if (interrupted) 1916eb9e2e8904ce85a6c7390be25bb873c6db88c4d3Roland McGrath return 0; 1917eb9e2e8904ce85a6c7390be25bb873c6db88c4d3Roland McGrath if (interactive) 1918eb9e2e8904ce85a6c7390be25bb873c6db88c4d3Roland McGrath sigprocmask(SIG_SETMASK, &empty_set, NULL); 1919978fbc901c4fe260caaa5881e54bd9cb54022101Denys Vlasenko#ifdef __WALL 192026d1b1eaa861ec33d2c671acc9c0ccb867042cb8Denys Vlasenko pid = wait4(-1, &status, wait4_options, rup); 19215bc05558bb9f9acd1f895ea128f3326ef4b03338Roland McGrath if (pid < 0 && (wait4_options & __WALL) && errno == EINVAL) { 19222f1d87e74ff68004b99901f964a1cbab89da09dbWichert Akkerman /* this kernel does not support __WALL */ 19232f1d87e74ff68004b99901f964a1cbab89da09dbWichert Akkerman wait4_options &= ~__WALL; 192426d1b1eaa861ec33d2c671acc9c0ccb867042cb8Denys Vlasenko pid = wait4(-1, &status, wait4_options, rup); 19252f1d87e74ff68004b99901f964a1cbab89da09dbWichert Akkerman } 19265bc05558bb9f9acd1f895ea128f3326ef4b03338Roland McGrath if (pid < 0 && !(wait4_options & __WALL) && errno == ECHILD) { 19272f1d87e74ff68004b99901f964a1cbab89da09dbWichert Akkerman /* most likely a "cloned" process */ 192826d1b1eaa861ec33d2c671acc9c0ccb867042cb8Denys Vlasenko pid = wait4(-1, &status, __WCLONE, rup); 192926d1b1eaa861ec33d2c671acc9c0ccb867042cb8Denys Vlasenko if (pid < 0) { 1930cb2ad00652e746b370703b5470932b7612308b9cDenys Vlasenko perror_msg("wait4(__WCLONE) failed"); 19312f1d87e74ff68004b99901f964a1cbab89da09dbWichert Akkerman } 19322f1d87e74ff68004b99901f964a1cbab89da09dbWichert Akkerman } 1933978fbc901c4fe260caaa5881e54bd9cb54022101Denys Vlasenko#else 193426d1b1eaa861ec33d2c671acc9c0ccb867042cb8Denys Vlasenko pid = wait4(-1, &status, 0, rup); 1935978fbc901c4fe260caaa5881e54bd9cb54022101Denys Vlasenko#endif /* __WALL */ 193676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman wait_errno = errno; 1937eb9e2e8904ce85a6c7390be25bb873c6db88c4d3Roland McGrath if (interactive) 1938eb9e2e8904ce85a6c7390be25bb873c6db88c4d3Roland McGrath sigprocmask(SIG_BLOCK, &blocked_set, NULL); 193976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 194026d1b1eaa861ec33d2c671acc9c0ccb867042cb8Denys Vlasenko if (pid < 0) { 1941eb9e2e8904ce85a6c7390be25bb873c6db88c4d3Roland McGrath switch (wait_errno) { 1942eb9e2e8904ce85a6c7390be25bb873c6db88c4d3Roland McGrath case EINTR: 194376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman continue; 1944eb9e2e8904ce85a6c7390be25bb873c6db88c4d3Roland McGrath case ECHILD: 194576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman /* 194676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * We would like to verify this case 194776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * but sometimes a race in Solbourne's 194876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * version of SunOS sometimes reports 194976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman * ECHILD before sending us SIGCHILD. 195076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman */ 1951eb9e2e8904ce85a6c7390be25bb873c6db88c4d3Roland McGrath return 0; 1952eb9e2e8904ce85a6c7390be25bb873c6db88c4d3Roland McGrath default: 1953eb9e2e8904ce85a6c7390be25bb873c6db88c4d3Roland McGrath errno = wait_errno; 19544c65c44478f1591d96cda425d78451334fe1d401Denys Vlasenko perror_msg("wait"); 1955eb9e2e8904ce85a6c7390be25bb873c6db88c4d3Roland McGrath return -1; 195676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 195776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 195810de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin if (pid == popen_pid) { 195910de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin if (WIFEXITED(status) || WIFSIGNALED(status)) 19607dd23384f77e9917bd3173c673f318c5d5b485acDenys Vlasenko popen_pid = 0; 196110de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin continue; 196210de62bb052b541af3d0566f05f3f870cce0e028Dmitry V. Levin } 1963f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko 1964f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko event = ((unsigned)status >> 16); 1965a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko if (debug_flag) { 19661d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko char buf[sizeof("WIFEXITED,exitcode=%u") + sizeof(int)*3 /*paranoia:*/ + 16]; 196767559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko char evbuf[sizeof(",PTRACE_EVENT_?? (%u)") + sizeof(int)*3 /*paranoia:*/ + 16]; 19681d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko strcpy(buf, "???"); 19691d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko if (WIFSIGNALED(status)) 19701d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko#ifdef WCOREDUMP 19711d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko sprintf(buf, "WIFSIGNALED,%ssig=%s", 19721d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko WCOREDUMP(status) ? "core," : "", 19731d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko signame(WTERMSIG(status))); 19741d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko#else 19751d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko sprintf(buf, "WIFSIGNALED,sig=%s", 19761d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko signame(WTERMSIG(status))); 19771d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko#endif 19781d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko if (WIFEXITED(status)) 19791d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko sprintf(buf, "WIFEXITED,exitcode=%u", WEXITSTATUS(status)); 19801d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko if (WIFSTOPPED(status)) 19811d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko sprintf(buf, "WIFSTOPPED,sig=%s", signame(WSTOPSIG(status))); 19825bd67c86a93c658d258348e8f14af94fd45cbeb6Denys Vlasenko#ifdef WIFCONTINUED 19831d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko if (WIFCONTINUED(status)) 19841d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko strcpy(buf, "WIFCONTINUED"); 19855bd67c86a93c658d258348e8f14af94fd45cbeb6Denys Vlasenko#endif 198667559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko evbuf[0] = '\0'; 198767559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko if (event != 0) { 198867559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko static const char *const event_names[] = { 198967559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko [PTRACE_EVENT_CLONE] = "CLONE", 199067559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko [PTRACE_EVENT_FORK] = "FORK", 199167559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko [PTRACE_EVENT_VFORK] = "VFORK", 199267559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko [PTRACE_EVENT_VFORK_DONE] = "VFORK_DONE", 199367559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko [PTRACE_EVENT_EXEC] = "EXEC", 199467559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko [PTRACE_EVENT_EXIT] = "EXIT", 199567559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko }; 199667559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko const char *e; 199767559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko if (event < ARRAY_SIZE(event_names)) 199867559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko e = event_names[event]; 199967559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko else { 200067559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko sprintf(buf, "?? (%u)", event); 200167559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko e = buf; 200267559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko } 200367559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko sprintf(evbuf, ",PTRACE_EVENT_%s", e); 200467559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko } 200567559ad260fd31c823615f650f5e131818acf20fDenys Vlasenko fprintf(stderr, " [wait(0x%04x) = %u] %s%s\n", status, pid, buf, evbuf); 20061d5f12ecb88f0cd7aa889d1d7ebd47449f4691b7Denys Vlasenko } 200776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 2008f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko /* Look up 'pid' in our table. */ 20095d64581e106f47c474707001f924ee15ef22830bDenys Vlasenko tcp = pid2tcb(pid); 2010f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko 20118511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko if (!tcp) { 20128511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko if (followfork) { 20138511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko tcp = alloctcb(pid); 20148511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko tcp->flags |= TCB_ATTACHED | TCB_STARTUP | post_attach_sigstop; 20158511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko newoutf(tcp); 20168511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko if (!qflag) 20178511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko fprintf(stderr, "Process %d attached\n", 20188511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko pid); 20198511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko } else { 20208511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko /* This can happen if a clone call used 20218511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko CLONE_PTRACE itself. */ 20228511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko if (WIFSTOPPED(status)) 20238511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko ptrace(PTRACE_CONT, pid, (char *) 0, 0); 20248511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko error_msg_and_die("Unknown pid: %u", pid); 20258511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko } 20268511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko } 20278511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko 2028ce7d953ebecc10f71e191b6d18cfeb2399429d5fDenys Vlasenko clear_regs(); 2029ce7d953ebecc10f71e191b6d18cfeb2399429d5fDenys Vlasenko if (WIFSTOPPED(status)) 2030ce7d953ebecc10f71e191b6d18cfeb2399429d5fDenys Vlasenko get_regs(pid); 2031ce7d953ebecc10f71e191b6d18cfeb2399429d5fDenys Vlasenko 2032f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko /* Under Linux, execve changes pid to thread leader's pid, 2033f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko * and we see this changed pid on EVENT_EXEC and later, 2034f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko * execve sysexit. Leader "disappears" without exit 2035f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko * notification. Let user know that, drop leader's tcb, 2036f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko * and fix up pid in execve thread's tcb. 2037f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko * Effectively, execve thread's tcb replaces leader's tcb. 2038f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko * 2039f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko * BTW, leader is 'stuck undead' (doesn't report WIFEXITED 2040f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko * on exit syscall) in multithreaded programs exactly 2041f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko * in order to handle this case. 2042f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko * 2043f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko * PTRACE_GETEVENTMSG returns old pid starting from Linux 3.0. 2044f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko * On 2.6 and earlier, it can return garbage. 2045f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko */ 20466e0bfd11ac1aa36713d9a65542ae86dd607ae374Denys Vlasenko if (event == PTRACE_EVENT_EXEC && os_release >= KERNEL_VERSION(3,0,0)) { 20476764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko FILE *fp; 20488511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko struct tcb *execve_thread; 2049f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko long old_pid = 0; 20508511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko 20518511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko if (ptrace(PTRACE_GETEVENTMSG, pid, NULL, (long) &old_pid) < 0) 20528511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko goto dont_switch_tcbs; 20538511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko if (old_pid <= 0 || old_pid == pid) 20548511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko goto dont_switch_tcbs; 20558511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko execve_thread = pid2tcb(old_pid); 20568511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko /* It should be !NULL, but I feel paranoid */ 20578511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko if (!execve_thread) 20588511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko goto dont_switch_tcbs; 20598511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko 20608511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko if (execve_thread->curcol != 0) { 20618511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko /* 20628511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko * One case we are here is -ff: 20638511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko * try "strace -oLOG -ff test/threaded_execve" 20648511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko */ 20658511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko fprintf(execve_thread->outf, " <pid changed to %d ...>\n", pid); 20666764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko /*execve_thread->curcol = 0; - no need, see code below */ 20678511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko } 20688511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko /* Swap output FILEs (needed for -ff) */ 20696764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko fp = execve_thread->outf; 20706764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko execve_thread->outf = tcp->outf; 20716764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko tcp->outf = fp; 20728511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko /* And their column positions */ 20736764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko execve_thread->curcol = tcp->curcol; 20746764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko tcp->curcol = 0; 20758511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko /* Drop leader, but close execve'd thread outfile (if -ff) */ 20768511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko droptcb(tcp); 20778511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko /* Switch to the thread, reusing leader's outfile and pid */ 20788511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko tcp = execve_thread; 20798511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko tcp->pid = pid; 20808511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko if (cflag != CFLAG_ONLY_STATS) { 20818511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko printleader(tcp); 20828511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko tprintf("+++ superseded by execve in pid %lu +++\n", old_pid); 20838511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko line_ended(); 20848511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko tcp->flags |= TCB_REPRINT; 2085f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko } 2086f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko } 20878511f2a1f02a31f66eab86bf95dee1636fb39076Denys Vlasenko dont_switch_tcbs: 2088f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko 20892a3d27552f17a5b378344620bec7d255bac65a8dDenys Vlasenko if (event == PTRACE_EVENT_EXEC) { 20902a3d27552f17a5b378344620bec7d255bac65a8dDenys Vlasenko if (detach_on_execve && !skip_one_b_execve) 20912a3d27552f17a5b378344620bec7d255bac65a8dDenys Vlasenko detach(tcp); /* do "-b execve" thingy */ 20922a3d27552f17a5b378344620bec7d255bac65a8dDenys Vlasenko skip_one_b_execve = 0; 209361e7aad9fa1a6a5bd5a586e6276767caf12b53f2Denys Vlasenko } 209461e7aad9fa1a6a5bd5a586e6276767caf12b53f2Denys Vlasenko 20957de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko /* Set current output file */ 20966764f8f2f0b71ecc069d607eb8525735d1684a59Denys Vlasenko current_tcp = tcp; 20977de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko 209813d22f1aa3a1beba79a8febb3770f75e646211a8Denys Vlasenko if (cflag) { 209976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman tv_sub(&tcp->dtime, &ru.ru_stime, &tcp->stime); 210076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman tcp->stime = ru.ru_stime; 210176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 2102eb9e2e8904ce85a6c7390be25bb873c6db88c4d3Roland McGrath 210376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman if (WIFSIGNALED(status)) { 2104a68096576afc07e51d33b49c432d658b27a7f13cDmitry V. Levin if (pid == strace_child) 2105a68096576afc07e51d33b49c432d658b27a7f13cDmitry V. Levin exit_code = 0x100 | WTERMSIG(status); 2106e3a7ef5a2a3ac31bfa0d3f9ce65981e51700073eDmitry V. Levin if (cflag != CFLAG_ONLY_STATS 2107a9fe13c9437707fa132fde4e51a20d88381e7430Denys Vlasenko && (qual_flags[WTERMSIG(status)] & QUAL_SIGNAL) 2108a9fe13c9437707fa132fde4e51a20d88381e7430Denys Vlasenko ) { 210976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman printleader(tcp); 211013d22f1aa3a1beba79a8febb3770f75e646211a8Denys Vlasenko#ifdef WCOREDUMP 2111000b601439d249a4afa2ceb6096850a702612d1eDenys Vlasenko tprintf("+++ killed by %s %s+++\n", 21122efe879fa8df30bf69c3a4c471dcc5e19ad0b6eaRoland McGrath signame(WTERMSIG(status)), 211313d22f1aa3a1beba79a8febb3770f75e646211a8Denys Vlasenko WCOREDUMP(status) ? "(core dumped) " : ""); 211413d22f1aa3a1beba79a8febb3770f75e646211a8Denys Vlasenko#else 2115000b601439d249a4afa2ceb6096850a702612d1eDenys Vlasenko tprintf("+++ killed by %s +++\n", 211613d22f1aa3a1beba79a8febb3770f75e646211a8Denys Vlasenko signame(WTERMSIG(status))); 21172efe879fa8df30bf69c3a4c471dcc5e19ad0b6eaRoland McGrath#endif 21187de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko line_ended(); 211976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 212076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman droptcb(tcp); 212176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman continue; 212276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 212376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman if (WIFEXITED(status)) { 2124a68096576afc07e51d33b49c432d658b27a7f13cDmitry V. Levin if (pid == strace_child) 2125a68096576afc07e51d33b49c432d658b27a7f13cDmitry V. Levin exit_code = WEXITSTATUS(status); 212601997cf32d4492b9898283ced45e8a4a6fd161b8Daniel P. Berrange if (cflag != CFLAG_ONLY_STATS && 212701997cf32d4492b9898283ced45e8a4a6fd161b8Daniel P. Berrange qflag < 2) { 212819cdada5b499b978ffd9c3367b4ef34ad6f8bf2bDenys Vlasenko printleader(tcp); 2129000b601439d249a4afa2ceb6096850a702612d1eDenys Vlasenko tprintf("+++ exited with %d +++\n", WEXITSTATUS(status)); 21307de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko line_ended(); 213119cdada5b499b978ffd9c3367b4ef34ad6f8bf2bDenys Vlasenko } 213276baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman droptcb(tcp); 213376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman continue; 213476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 213576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman if (!WIFSTOPPED(status)) { 213676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman fprintf(stderr, "PANIC: pid %u not stopped\n", pid); 213776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman droptcb(tcp); 213876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman continue; 213976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 214076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 2141f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko /* Is this the very first time we see this tracee stopped? */ 2142f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko if (tcp->flags & TCB_STARTUP) { 2143a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko if (debug_flag) 2144f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko fprintf(stderr, "pid %d has TCB_STARTUP, initializing it\n", tcp->pid); 214576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman tcp->flags &= ~TCB_STARTUP; 214602203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath if (tcp->flags & TCB_BPTSET) { 214776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman /* 214802203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath * One example is a breakpoint inherited from 21492ecba32d52db699538bcfc3f69259aaff32a0fa9Denys Vlasenko * parent through fork(). 215076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman */ 21516cda73ff9ca94e2be56d04186fceaca223a9c45bDenys Vlasenko if (clearbpt(tcp) < 0) { 21526cda73ff9ca94e2be56d04186fceaca223a9c45bDenys Vlasenko /* Pretty fatal */ 215376baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman droptcb(tcp); 215476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman cleanup(); 215576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman return -1; 215676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 215776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 215844f87efc676467ab47972feec49af4f7f34356bfDenys Vlasenko if (ptrace_setoptions) { 2159a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko if (debug_flag) 216044f87efc676467ab47972feec49af4f7f34356bfDenys Vlasenko fprintf(stderr, "setting opts %x on pid %d\n", ptrace_setoptions, tcp->pid); 216144f87efc676467ab47972feec49af4f7f34356bfDenys Vlasenko if (ptrace(PTRACE_SETOPTIONS, tcp->pid, NULL, ptrace_setoptions) < 0) { 216244f87efc676467ab47972feec49af4f7f34356bfDenys Vlasenko if (errno != ESRCH) { 216344f87efc676467ab47972feec49af4f7f34356bfDenys Vlasenko /* Should never happen, really */ 216444f87efc676467ab47972feec49af4f7f34356bfDenys Vlasenko perror_msg_and_die("PTRACE_SETOPTIONS"); 21653454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko } 21663454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko } 21673454e4b463e6c22c7ea8c5461ef5a077f4650a54Denys Vlasenko } 2168f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko } 2169f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko 217031fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko sig = WSTOPSIG(status); 217131fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 2172f7db5dd876eb41a3f0d5fd223c831734acc8d8d1Denys Vlasenko if (event != 0) { 217331fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko /* Ptrace event */ 21745c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko#if USE_SEIZE 217526bc0606d96d05d30ba263939a0451889340a64cDenys Vlasenko if (event == PTRACE_EVENT_STOP) { 21766703816060c2cf4aaf9c82057ced31c3ba744346Denys Vlasenko /* 21776703816060c2cf4aaf9c82057ced31c3ba744346Denys Vlasenko * PTRACE_INTERRUPT-stop or group-stop. 21786703816060c2cf4aaf9c82057ced31c3ba744346Denys Vlasenko * PTRACE_INTERRUPT-stop has sig == SIGTRAP here. 21796703816060c2cf4aaf9c82057ced31c3ba744346Denys Vlasenko */ 218031fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (sig == SIGSTOP 218131fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko || sig == SIGTSTP 218231fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko || sig == SIGTTIN 218331fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko || sig == SIGTTOU 218431fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko ) { 218531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko stopped = 1; 218631fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko goto show_stopsig; 218731fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 218831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 218931fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko#endif 2190f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko goto restart_tracee_with_sig_0; 2191f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko } 2192f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko 2193f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko /* Is this post-attach SIGSTOP? 2194f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko * Interestingly, the process may stop 2195f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko * with STOPSIG equal to some other signal 2196f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko * than SIGSTOP if we happend to attach 2197f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko * just before the process takes a signal. 2198f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko */ 2199f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko if (sig == SIGSTOP && (tcp->flags & TCB_IGNORE_ONE_SIGSTOP)) { 2200a50d2a87a1a8df4471bbd93f2ce9ef0541b1124bDenys Vlasenko if (debug_flag) 2201f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko fprintf(stderr, "ignored SIGSTOP on pid %d\n", tcp->pid); 2202f88837a666a716aecd9974f7ef3fcf006e0afce1Denys Vlasenko tcp->flags &= ~TCB_IGNORE_ONE_SIGSTOP; 22036cda73ff9ca94e2be56d04186fceaca223a9c45bDenys Vlasenko goto restart_tracee_with_sig_0; 220476baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 220576baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman 22066cda73ff9ca94e2be56d04186fceaca223a9c45bDenys Vlasenko if (sig != syscall_trap_sig) { 220731fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko siginfo_t si; 220831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 220931fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko /* Nonzero (true) if tracee is stopped by signal 221031fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko * (as opposed to "tracee received signal"). 2211a44f9696e45f5bb51c6ec37c0ef95dc2cdfd4c8aDenys Vlasenko * TODO: shouldn't we check for errno == EINVAL too? 2212a44f9696e45f5bb51c6ec37c0ef95dc2cdfd4c8aDenys Vlasenko * We can get ESRCH instead, you know... 221331fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko */ 221431fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko stopped = (ptrace(PTRACE_GETSIGINFO, pid, 0, (long) &si) < 0); 22155c9d8f4fc5318fc740ec2a16bac5b8a29e7eb52dDenys Vlasenko#if USE_SEIZE 221631fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko show_stopsig: 22176703816060c2cf4aaf9c82057ced31c3ba744346Denys Vlasenko#endif 2218e3a7ef5a2a3ac31bfa0d3f9ce65981e51700073eDmitry V. Levin if (cflag != CFLAG_ONLY_STATS 2219e8ff4c6f863c16180dacff74988f0e617f8136d9Dmitry V. Levin && !hide_log_until_execve 2220e8ff4c6f863c16180dacff74988f0e617f8136d9Dmitry V. Levin && (qual_flags[sig] & QUAL_SIGNAL) 2221e8ff4c6f863c16180dacff74988f0e617f8136d9Dmitry V. Levin ) { 2222c15dfc796150d09bb74bebfbb85bebf142766b6cDmitry V. Levin#if defined(PT_CR_IPSR) && defined(PT_CR_IIP) 22236b7a261ff81fdbe84769cb59852fa43cabc77e8fDmitry V. Levin long pc = 0; 22246b7a261ff81fdbe84769cb59852fa43cabc77e8fDmitry V. Levin long psr = 0; 22257b3346be42d6a1f539e95d385ee498f8b3c529f8Wichert Akkerman 2226932fc7d4fc1a29e8b8bcea5685db3f6c2e212e36Denys Vlasenko upeek(tcp, PT_CR_IPSR, &psr); 2227932fc7d4fc1a29e8b8bcea5685db3f6c2e212e36Denys Vlasenko upeek(tcp, PT_CR_IIP, &pc); 22287b3346be42d6a1f539e95d385ee498f8b3c529f8Wichert Akkerman 22296b7a261ff81fdbe84769cb59852fa43cabc77e8fDmitry V. Levin# define PSR_RI 41 22307b3346be42d6a1f539e95d385ee498f8b3c529f8Wichert Akkerman pc += (psr >> PSR_RI) & 0x3; 22316b7a261ff81fdbe84769cb59852fa43cabc77e8fDmitry V. Levin# define PC_FORMAT_STR " @ %lx" 22322ecba32d52db699538bcfc3f69259aaff32a0fa9Denys Vlasenko# define PC_FORMAT_ARG , pc 22336b7a261ff81fdbe84769cb59852fa43cabc77e8fDmitry V. Levin#else 22342ecba32d52db699538bcfc3f69259aaff32a0fa9Denys Vlasenko# define PC_FORMAT_STR "" 22352ecba32d52db699538bcfc3f69259aaff32a0fa9Denys Vlasenko# define PC_FORMAT_ARG /* nothing */ 22367b3346be42d6a1f539e95d385ee498f8b3c529f8Wichert Akkerman#endif 2237e8ff4c6f863c16180dacff74988f0e617f8136d9Dmitry V. Levin printleader(tcp); 2238e8ff4c6f863c16180dacff74988f0e617f8136d9Dmitry V. Levin if (!stopped) { 2239e8ff4c6f863c16180dacff74988f0e617f8136d9Dmitry V. Levin tprintf("--- %s ", signame(sig)); 2240e8ff4c6f863c16180dacff74988f0e617f8136d9Dmitry V. Levin printsiginfo(&si, verbose(tcp)); 2241e8ff4c6f863c16180dacff74988f0e617f8136d9Dmitry V. Levin tprintf(PC_FORMAT_STR " ---\n" 2242e8ff4c6f863c16180dacff74988f0e617f8136d9Dmitry V. Levin PC_FORMAT_ARG); 2243e8ff4c6f863c16180dacff74988f0e617f8136d9Dmitry V. Levin } else 2244e8ff4c6f863c16180dacff74988f0e617f8136d9Dmitry V. Levin tprintf("--- stopped by %s" PC_FORMAT_STR " ---\n", 2245e8ff4c6f863c16180dacff74988f0e617f8136d9Dmitry V. Levin signame(sig) 2246e8ff4c6f863c16180dacff74988f0e617f8136d9Dmitry V. Levin PC_FORMAT_ARG); 2247e8ff4c6f863c16180dacff74988f0e617f8136d9Dmitry V. Levin line_ended(); 224876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 224931fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 225031fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (!stopped) 225131fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko /* It's signal-delivery-stop. Inject the signal */ 225231fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko goto restart_tracee; 225331fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko 225431fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko /* It's group-stop */ 225531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (use_seize) { 225631fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko /* 225731fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko * This ends ptrace-stop, but does *not* end group-stop. 225831fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko * This makes stopping signals work properly on straced process 225931fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko * (that is, process really stops. It used to continue to run). 226031fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko */ 226131fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko if (ptrace_restart(PTRACE_LISTEN, tcp, 0) < 0) { 226231fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko cleanup(); 226331fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko return -1; 226431fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 226531fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko continue; 226631fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko } 226731fa8a22b17b2f898513b68e04269597147d2478Denys Vlasenko /* We don't have PTRACE_LISTEN support... */ 22686cda73ff9ca94e2be56d04186fceaca223a9c45bDenys Vlasenko goto restart_tracee; 226976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 22702ecba32d52db699538bcfc3f69259aaff32a0fa9Denys Vlasenko 22712ecba32d52db699538bcfc3f69259aaff32a0fa9Denys Vlasenko /* We handled quick cases, we are permitted to interrupt now. */ 227202203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath if (interrupted) 227302203311e96a90608c30e6604dc1f7bda0a777f0Roland McGrath return 0; 22742ecba32d52db699538bcfc3f69259aaff32a0fa9Denys Vlasenko 22752ecba32d52db699538bcfc3f69259aaff32a0fa9Denys Vlasenko /* This should be syscall entry or exit. 22762ecba32d52db699538bcfc3f69259aaff32a0fa9Denys Vlasenko * (Or it still can be that pesky post-execve SIGTRAP!) 22772ecba32d52db699538bcfc3f69259aaff32a0fa9Denys Vlasenko * Handle it. 22782ecba32d52db699538bcfc3f69259aaff32a0fa9Denys Vlasenko */ 2279235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko if (trace_syscall(tcp) < 0) { 2280235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko /* ptrace() failed in trace_syscall(). 2281eb9e2e8904ce85a6c7390be25bb873c6db88c4d3Roland McGrath * Likely a result of process disappearing mid-flight. 2282235067525cc064a9a466c245fa8a6265ae136306Denys Vlasenko * Observed case: exit_group() or SIGKILL terminating 2283f1e690370359f61f9533134817b52d74460a20fbDenys Vlasenko * all processes in thread group. 22847de265d88a78a27d58c2c728424e5bb8379ef351Denys Vlasenko * We assume that ptrace error was caused by process death. 2285f20250266eb5988805b03b1cc0fa74cdb6398742Denys Vlasenko * We used to detach(tcp) here, but since we no longer 2286f20250266eb5988805b03b1cc0fa74cdb6398742Denys Vlasenko * implement "detach before death" policy/hack, 2287f20250266eb5988805b03b1cc0fa74cdb6398742Denys Vlasenko * we can let this process to report its death to us 2288f20250266eb5988805b03b1cc0fa74cdb6398742Denys Vlasenko * normally, via WIFEXITED or WIFSIGNALED wait status. 2289f20250266eb5988805b03b1cc0fa74cdb6398742Denys Vlasenko */ 229076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman continue; 229176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 22926cda73ff9ca94e2be56d04186fceaca223a9c45bDenys Vlasenko restart_tracee_with_sig_0: 22936cda73ff9ca94e2be56d04186fceaca223a9c45bDenys Vlasenko sig = 0; 22946cda73ff9ca94e2be56d04186fceaca223a9c45bDenys Vlasenko restart_tracee: 22956cda73ff9ca94e2be56d04186fceaca223a9c45bDenys Vlasenko if (ptrace_restart(PTRACE_SYSCALL, tcp, sig) < 0) { 229676baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman cleanup(); 229776baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman return -1; 229876baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 229976baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman } 230076baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman return 0; 230176baf7c9f6dd61a15524ad43c1b690c252cf5b7Wichert Akkerman} 2302ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko 2303ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenkoint 2304ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenkomain(int argc, char *argv[]) 2305ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko{ 2306ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko init(argc, argv); 2307ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko 2308ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko /* Run main tracing loop */ 2309ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko if (trace() < 0) 2310ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko return 1; 2311ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko 2312ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko cleanup(); 2313ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko fflush(NULL); 2314cf53436f737c0273028503186fc0f837c7191085Dmitry V. Levin if (shared_log != stderr) 2315cf53436f737c0273028503186fc0f837c7191085Dmitry V. Levin fclose(shared_log); 2316cf53436f737c0273028503186fc0f837c7191085Dmitry V. Levin if (popen_pid) { 2317cf53436f737c0273028503186fc0f837c7191085Dmitry V. Levin while (waitpid(popen_pid, NULL, 0) < 0 && errno == EINTR) 2318cf53436f737c0273028503186fc0f837c7191085Dmitry V. Levin ; 2319cf53436f737c0273028503186fc0f837c7191085Dmitry V. Levin } 2320ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko if (exit_code > 0xff) { 2321ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko /* Avoid potential core file clobbering. */ 2322c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin struct_rlimit rlim = {0, 0}; 2323c8938e08ad06ae7bf0f50872ddbb0efbe7bf7560Dmitry V. Levin set_rlimit(RLIMIT_CORE, &rlim); 2324ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko 2325ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko /* Child was killed by a signal, mimic that. */ 2326ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko exit_code &= 0xff; 2327ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko signal(exit_code, SIG_DFL); 2328ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko raise(exit_code); 2329ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko /* Paranoia - what if this signal is not fatal? 2330ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko Exit with 128 + signo then. */ 2331ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko exit_code += 128; 2332ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko } 2333ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko 2334ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko return exit_code; 2335ecc8b97c9bd36ad25c550ec412f43f44b59e2ebdDenys Vlasenko} 2336