linux-pid-attach.c revision 02cefdaa6429e620d6457fdb3ad9934f194c5a93
10b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil/* Get Dwarf Frame state for target live PID process. 24b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard Copyright (C) 2013, 2014 Red Hat, Inc. 30b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil This file is part of elfutils. 40b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil 50b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil This file is free software; you can redistribute it and/or modify 60b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil it under the terms of either 70b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil 80b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil * the GNU Lesser General Public License as published by the Free 90b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil Software Foundation; either version 3 of the License, or (at 100b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil your option) any later version 110b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil 120b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil or 130b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil 140b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil * the GNU General Public License as published by the Free 150b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil Software Foundation; either version 2 of the License, or (at 160b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil your option) any later version 170b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil 180b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil or both in parallel, as here. 190b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil 200b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil elfutils is distributed in the hope that it will be useful, but 210b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil WITHOUT ANY WARRANTY; without even the implied warranty of 220b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 230b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil General Public License for more details. 240b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil 250b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil You should have received copies of the GNU General Public License and 260b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil the GNU Lesser General Public License along with this program. If 270b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil not, see <http://www.gnu.org/licenses/>. */ 280b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil 290b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil#include "libdwflP.h" 300b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil#include <sys/ptrace.h> 310b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil#include <sys/wait.h> 320b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil#include <dirent.h> 330b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil#include <sys/syscall.h> 340b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil#include <unistd.h> 350b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil 360b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil#ifndef MAX 370b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil# define MAX(a, b) ((a) > (b) ? (a) : (b)) 380b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil#endif 390b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil 4002cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx#ifdef __linux__ 410b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil 420b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvilstatic bool 430b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvillinux_proc_pid_is_stopped (pid_t pid) 440b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil{ 450b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil char buffer[64]; 460b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil FILE *procfile; 470b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil bool retval, have_state; 480b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil 490b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil snprintf (buffer, sizeof (buffer), "/proc/%ld/status", (long) pid); 500b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil procfile = fopen (buffer, "r"); 510b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil if (procfile == NULL) 520b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil return false; 530b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil 540b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil have_state = false; 550b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil while (fgets (buffer, sizeof (buffer), procfile) != NULL) 560b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil if (strncmp (buffer, "State:", 6) == 0) 570b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil { 580b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil have_state = true; 590b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil break; 600b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil } 610b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil retval = (have_state && strstr (buffer, "T (stopped)") != NULL); 620b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil fclose (procfile); 630b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil return retval; 640b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil} 650b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil 664b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaardbool 674b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaardinternal_function 684b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard__libdwfl_ptrace_attach (pid_t tid, bool *tid_was_stoppedp) 690b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil{ 700b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil if (ptrace (PTRACE_ATTACH, tid, NULL, NULL) != 0) 710b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil { 720b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil __libdwfl_seterrno (DWFL_E_ERRNO); 730b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil return false; 740b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil } 7510d7a39aa2a509c16edd205c94b365ff1696f4fbJan Kratochvil *tid_was_stoppedp = linux_proc_pid_is_stopped (tid); 7610d7a39aa2a509c16edd205c94b365ff1696f4fbJan Kratochvil if (*tid_was_stoppedp) 770b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil { 780b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil /* Make sure there is a SIGSTOP signal pending even when the process is 790b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil already State: T (stopped). Older kernels might fail to generate 800b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil a SIGSTOP notification in that case in response to our PTRACE_ATTACH 810b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil above. Which would make the waitpid below wait forever. So emulate 820b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil it. Since there can only be one SIGSTOP notification pending this is 830b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil safe. See also gdb/linux-nat.c linux_nat_post_attach_wait. */ 840b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil syscall (__NR_tkill, tid, SIGSTOP); 850b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil ptrace (PTRACE_CONT, tid, NULL, NULL); 860b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil } 870b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil for (;;) 880b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil { 890b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil int status; 900b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil if (waitpid (tid, &status, __WALL) != tid || !WIFSTOPPED (status)) 910b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil { 920b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil int saved_errno = errno; 930b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil ptrace (PTRACE_DETACH, tid, NULL, NULL); 940b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil errno = saved_errno; 950b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil __libdwfl_seterrno (DWFL_E_ERRNO); 960b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil return false; 970b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil } 980b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil if (WSTOPSIG (status) == SIGSTOP) 990b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil break; 1000b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil if (ptrace (PTRACE_CONT, tid, NULL, 1010b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil (void *) (uintptr_t) WSTOPSIG (status)) != 0) 1020b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil { 1030b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil int saved_errno = errno; 1040b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil ptrace (PTRACE_DETACH, tid, NULL, NULL); 1050b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil errno = saved_errno; 1060b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil __libdwfl_seterrno (DWFL_E_ERRNO); 1070b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil return false; 1080b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil } 1090b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil } 1100b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil return true; 1110b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil} 1120b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil 1130b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvilstatic bool 1140b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvilpid_memory_read (Dwfl *dwfl, Dwarf_Addr addr, Dwarf_Word *result, void *arg) 1150b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil{ 1164b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard struct __libdwfl_pid_arg *pid_arg = arg; 1170b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil pid_t tid = pid_arg->tid_attached; 1180b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil assert (tid > 0); 1190b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil Dwfl_Process *process = dwfl->process; 1200b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil if (ebl_get_elfclass (process->ebl) == ELFCLASS64) 1210b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil { 1220b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil#if SIZEOF_LONG == 8 1230b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil errno = 0; 1240b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil *result = ptrace (PTRACE_PEEKDATA, tid, (void *) (uintptr_t) addr, NULL); 1250b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil return errno == 0; 1260b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil#else /* SIZEOF_LONG != 8 */ 1270b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil /* This should not happen. */ 1280b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil return false; 1290b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil#endif /* SIZEOF_LONG != 8 */ 1300b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil } 1310b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil#if SIZEOF_LONG == 8 1320b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil /* We do not care about reads unaliged to 4 bytes boundary. 1330b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil But 0x...ffc read of 8 bytes could overrun a page. */ 1340b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil bool lowered = (addr & 4) != 0; 1350b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil if (lowered) 1360b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil addr -= 4; 1370b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil#endif /* SIZEOF_LONG == 8 */ 1380b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil errno = 0; 1390b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil *result = ptrace (PTRACE_PEEKDATA, tid, (void *) (uintptr_t) addr, NULL); 1400b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil if (errno != 0) 1410b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil return false; 1420b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil#if SIZEOF_LONG == 8 1430b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil# if BYTE_ORDER == BIG_ENDIAN 1440b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil if (! lowered) 1450b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil *result >>= 32; 1460b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil# else 1470b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil if (lowered) 1480b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil *result >>= 32; 1490b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil# endif 1500b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil#endif /* SIZEOF_LONG == 8 */ 1510b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil *result &= 0xffffffff; 1520b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil return true; 1530b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil} 1540b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil 1550b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvilstatic pid_t 1560b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvilpid_next_thread (Dwfl *dwfl __attribute__ ((unused)), void *dwfl_arg, 1570b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil void **thread_argp) 1580b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil{ 1594b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard struct __libdwfl_pid_arg *pid_arg = dwfl_arg; 1600b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil struct dirent *dirent; 161c76b2ff3eebc04c628ea7475c7ea0abb6cf0ff0dMark Wielaard /* Start fresh on first traversal. */ 162c76b2ff3eebc04c628ea7475c7ea0abb6cf0ff0dMark Wielaard if (*thread_argp == NULL) 163c76b2ff3eebc04c628ea7475c7ea0abb6cf0ff0dMark Wielaard rewinddir (pid_arg->dir); 1640b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil do 1650b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil { 1660b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil errno = 0; 1670b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil dirent = readdir (pid_arg->dir); 1680b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil if (dirent == NULL) 1690b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil { 1700b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil if (errno != 0) 1710b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil { 1720b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil __libdwfl_seterrno (DWFL_E_ERRNO); 1730b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil return -1; 1740b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil } 1750b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil return 0; 1760b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil } 1770b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil } 1780b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil while (strcmp (dirent->d_name, ".") == 0 1790b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil || strcmp (dirent->d_name, "..") == 0); 1800b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil char *end; 1810b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil errno = 0; 1820b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil long tidl = strtol (dirent->d_name, &end, 10); 1830b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil if (errno != 0) 1840b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil { 1850b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil __libdwfl_seterrno (DWFL_E_ERRNO); 1860b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil return -1; 1870b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil } 1880b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil pid_t tid = tidl; 1890b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil if (tidl <= 0 || (end && *end) || tid != tidl) 1900b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil { 1910b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil __libdwfl_seterrno (DWFL_E_PARSE_PROC); 1920b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil return -1; 1930b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil } 1940b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil *thread_argp = dwfl_arg; 1950b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil return tid; 1960b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil} 1970b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil 198e962ec3bcbe8eccdcded36aaafee7bec41fa1bc4Mark Wielaard/* Just checks that the thread id exists. */ 199e962ec3bcbe8eccdcded36aaafee7bec41fa1bc4Mark Wielaardstatic bool 200e962ec3bcbe8eccdcded36aaafee7bec41fa1bc4Mark Wielaardpid_getthread (Dwfl *dwfl __attribute__ ((unused)), pid_t tid, 201e962ec3bcbe8eccdcded36aaafee7bec41fa1bc4Mark Wielaard void *dwfl_arg, void **thread_argp) 202e962ec3bcbe8eccdcded36aaafee7bec41fa1bc4Mark Wielaard{ 203e962ec3bcbe8eccdcded36aaafee7bec41fa1bc4Mark Wielaard *thread_argp = dwfl_arg; 204e962ec3bcbe8eccdcded36aaafee7bec41fa1bc4Mark Wielaard if (kill (tid, 0) < 0) 205e962ec3bcbe8eccdcded36aaafee7bec41fa1bc4Mark Wielaard { 206e962ec3bcbe8eccdcded36aaafee7bec41fa1bc4Mark Wielaard __libdwfl_seterrno (DWFL_E_ERRNO); 207e962ec3bcbe8eccdcded36aaafee7bec41fa1bc4Mark Wielaard return false; 208e962ec3bcbe8eccdcded36aaafee7bec41fa1bc4Mark Wielaard } 209e962ec3bcbe8eccdcded36aaafee7bec41fa1bc4Mark Wielaard return true; 210e962ec3bcbe8eccdcded36aaafee7bec41fa1bc4Mark Wielaard} 211e962ec3bcbe8eccdcded36aaafee7bec41fa1bc4Mark Wielaard 2120b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil/* Implement the ebl_set_initial_registers_tid setfunc callback. */ 2130b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil 2140b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvilstatic bool 2151c1a53b657ef31b168928925884c01a7e4bcaf0cJan Kratochvilpid_thread_state_registers_cb (int firstreg, unsigned nregs, 2161c1a53b657ef31b168928925884c01a7e4bcaf0cJan Kratochvil const Dwarf_Word *regs, void *arg) 2170b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil{ 2180b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil Dwfl_Thread *thread = (Dwfl_Thread *) arg; 2195cbf42aaf47195e2c41171786371d55b253a7667Jan Kratochvil if (firstreg < 0) 2205cbf42aaf47195e2c41171786371d55b253a7667Jan Kratochvil { 2215cbf42aaf47195e2c41171786371d55b253a7667Jan Kratochvil assert (firstreg == -1); 2225cbf42aaf47195e2c41171786371d55b253a7667Jan Kratochvil assert (nregs == 1); 2235cbf42aaf47195e2c41171786371d55b253a7667Jan Kratochvil INTUSE(dwfl_thread_state_register_pc) (thread, *regs); 2245cbf42aaf47195e2c41171786371d55b253a7667Jan Kratochvil return true; 2255cbf42aaf47195e2c41171786371d55b253a7667Jan Kratochvil } 2265cbf42aaf47195e2c41171786371d55b253a7667Jan Kratochvil assert (nregs > 0); 2270b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil return INTUSE(dwfl_thread_state_registers) (thread, firstreg, nregs, regs); 2280b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil} 2290b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil 2300b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvilstatic bool 2310b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvilpid_set_initial_registers (Dwfl_Thread *thread, void *thread_arg) 2320b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil{ 2334b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard struct __libdwfl_pid_arg *pid_arg = thread_arg; 2340b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil assert (pid_arg->tid_attached == 0); 2350b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil pid_t tid = INTUSE(dwfl_thread_tid) (thread); 23619108019192ab273c53ae324be448d29dac806caMark Wielaard if (! pid_arg->assume_ptrace_stopped 2374b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard && ! __libdwfl_ptrace_attach (tid, &pid_arg->tid_was_stopped)) 2380b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil return false; 2390b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil pid_arg->tid_attached = tid; 2400b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil Dwfl_Process *process = thread->process; 2410b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil Ebl *ebl = process->ebl; 2420b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil return ebl_set_initial_registers_tid (ebl, tid, 2430b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil pid_thread_state_registers_cb, thread); 2440b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil} 2450b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil 2460b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvilstatic void 2470b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvilpid_detach (Dwfl *dwfl __attribute__ ((unused)), void *dwfl_arg) 2480b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil{ 2494b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard struct __libdwfl_pid_arg *pid_arg = dwfl_arg; 2500b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil closedir (pid_arg->dir); 2510b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil free (pid_arg); 2520b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil} 2530b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil 2544b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaardvoid 2554b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaardinternal_function 2564b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard__libdwfl_ptrace_detach (pid_t tid, bool tid_was_stopped) 2574b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard{ 2584b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard /* This handling is needed only on older Linux kernels such as 2594b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard 2.6.32-358.23.2.el6.ppc64. Later kernels such as 2604b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard 3.11.7-200.fc19.x86_64 remember the T (stopped) state 2614b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard themselves and no longer need to pass SIGSTOP during 2624b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard PTRACE_DETACH. */ 2634b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard ptrace (PTRACE_DETACH, tid, NULL, 2644b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard (void *) (intptr_t) (tid_was_stopped ? SIGSTOP : 0)); 2654b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard} 2664b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard 2670b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvilstatic void 2680b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvilpid_thread_detach (Dwfl_Thread *thread, void *thread_arg) 2690b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil{ 2704b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard struct __libdwfl_pid_arg *pid_arg = thread_arg; 2710b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil pid_t tid = INTUSE(dwfl_thread_tid) (thread); 2720b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil assert (pid_arg->tid_attached == tid); 2730b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil pid_arg->tid_attached = 0; 27419108019192ab273c53ae324be448d29dac806caMark Wielaard if (! pid_arg->assume_ptrace_stopped) 2754b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard __libdwfl_ptrace_detach (tid, pid_arg->tid_was_stopped); 2760b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil} 2770b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil 2780b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvilstatic const Dwfl_Thread_Callbacks pid_thread_callbacks = 2790b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil{ 2800b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil pid_next_thread, 281e962ec3bcbe8eccdcded36aaafee7bec41fa1bc4Mark Wielaard pid_getthread, 2820b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil pid_memory_read, 2830b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil pid_set_initial_registers, 2840b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil pid_detach, 2850b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil pid_thread_detach, 2860b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil}; 2870b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil 28819108019192ab273c53ae324be448d29dac806caMark Wielaardint 28919108019192ab273c53ae324be448d29dac806caMark Wielaarddwfl_linux_proc_attach (Dwfl *dwfl, pid_t pid, bool assume_ptrace_stopped) 2900b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil{ 29197bbf9b7ca002aab236bf750aba699d81f7985f7Mark Wielaard char buffer[36]; 29297bbf9b7ca002aab236bf750aba699d81f7985f7Mark Wielaard FILE *procfile; 29397bbf9b7ca002aab236bf750aba699d81f7985f7Mark Wielaard 29497bbf9b7ca002aab236bf750aba699d81f7985f7Mark Wielaard /* Make sure to report the actual PID (thread group leader) to 29597bbf9b7ca002aab236bf750aba699d81f7985f7Mark Wielaard dwfl_attach_state. */ 29697bbf9b7ca002aab236bf750aba699d81f7985f7Mark Wielaard snprintf (buffer, sizeof (buffer), "/proc/%ld/status", (long) pid); 29797bbf9b7ca002aab236bf750aba699d81f7985f7Mark Wielaard procfile = fopen (buffer, "r"); 29897bbf9b7ca002aab236bf750aba699d81f7985f7Mark Wielaard if (procfile == NULL) 29919108019192ab273c53ae324be448d29dac806caMark Wielaard return errno; 30097bbf9b7ca002aab236bf750aba699d81f7985f7Mark Wielaard 30197bbf9b7ca002aab236bf750aba699d81f7985f7Mark Wielaard char *line = NULL; 30297bbf9b7ca002aab236bf750aba699d81f7985f7Mark Wielaard size_t linelen = 0; 30397bbf9b7ca002aab236bf750aba699d81f7985f7Mark Wielaard while (getline (&line, &linelen, procfile) >= 0) 30497bbf9b7ca002aab236bf750aba699d81f7985f7Mark Wielaard if (strncmp (line, "Tgid:", 5) == 0) 30597bbf9b7ca002aab236bf750aba699d81f7985f7Mark Wielaard { 30668de442d13f7b3192d0b81634c0f2136002c4552Mark Wielaard errno = 0; 30768de442d13f7b3192d0b81634c0f2136002c4552Mark Wielaard char *endptr; 30868de442d13f7b3192d0b81634c0f2136002c4552Mark Wielaard long val = strtol (&line[5], &endptr, 10); 30968de442d13f7b3192d0b81634c0f2136002c4552Mark Wielaard if ((errno == ERANGE && val == LONG_MAX) 31068de442d13f7b3192d0b81634c0f2136002c4552Mark Wielaard || *endptr != '\n' || val < 0 || val != (pid_t) val) 31168de442d13f7b3192d0b81634c0f2136002c4552Mark Wielaard pid = 0; 31268de442d13f7b3192d0b81634c0f2136002c4552Mark Wielaard else 31368de442d13f7b3192d0b81634c0f2136002c4552Mark Wielaard pid = (pid_t) val; 31468de442d13f7b3192d0b81634c0f2136002c4552Mark Wielaard break; 31597bbf9b7ca002aab236bf750aba699d81f7985f7Mark Wielaard } 31697bbf9b7ca002aab236bf750aba699d81f7985f7Mark Wielaard free (line); 31797bbf9b7ca002aab236bf750aba699d81f7985f7Mark Wielaard fclose (procfile); 31897bbf9b7ca002aab236bf750aba699d81f7985f7Mark Wielaard 31997bbf9b7ca002aab236bf750aba699d81f7985f7Mark Wielaard if (pid == 0) 32019108019192ab273c53ae324be448d29dac806caMark Wielaard return ESRCH; 32197bbf9b7ca002aab236bf750aba699d81f7985f7Mark Wielaard 3220b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil char dirname[64]; 3230b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil int i = snprintf (dirname, sizeof (dirname), "/proc/%ld/task", (long) pid); 3240b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil assert (i > 0 && i < (ssize_t) sizeof (dirname) - 1); 3250b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil DIR *dir = opendir (dirname); 3260b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil if (dir == NULL) 32719108019192ab273c53ae324be448d29dac806caMark Wielaard return errno; 3284b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard struct __libdwfl_pid_arg *pid_arg = malloc (sizeof *pid_arg); 3290b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil if (pid_arg == NULL) 3300b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil { 3310b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil closedir (dir); 33219108019192ab273c53ae324be448d29dac806caMark Wielaard return ENOMEM; 3330b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil } 3340b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil pid_arg->dir = dir; 3350b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil pid_arg->tid_attached = 0; 33619108019192ab273c53ae324be448d29dac806caMark Wielaard pid_arg->assume_ptrace_stopped = assume_ptrace_stopped; 337ed78237ef7c31fb1d7dc80e2c2e07484e1216727Jan Kratochvil if (! INTUSE(dwfl_attach_state) (dwfl, NULL, pid, &pid_thread_callbacks, 3380b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil pid_arg)) 3390b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil { 3400b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil closedir (dir); 3410b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil free (pid_arg); 34219108019192ab273c53ae324be448d29dac806caMark Wielaard return -1; 3430b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil } 34419108019192ab273c53ae324be448d29dac806caMark Wielaard return 0; 3450b867460075c9f02cb305abc91a0e12b90017583Jan Kratochvil} 34619108019192ab273c53ae324be448d29dac806caMark WielaardINTDEF (dwfl_linux_proc_attach) 3474b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard 3484b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaardstruct __libdwfl_pid_arg * 3494b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaardinternal_function 3504b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard__libdwfl_get_pid_arg (Dwfl *dwfl) 3514b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard{ 3524b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard if (dwfl != NULL && dwfl->process != NULL 3534b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard && dwfl->process->callbacks == &pid_thread_callbacks) 3544b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard return (struct __libdwfl_pid_arg *) dwfl->process->callbacks_arg; 3554b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard 3564b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard return NULL; 3574b9e1433d2272f5f68b3227abdd9cf6817a0afd3Mark Wielaard} 35802cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx 35902cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx#else /* __linux__ */ 36002cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx 36102cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckxstatic pid_t 36202cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckxpid_next_thread (Dwfl *dwfl __attribute__ ((unused)), 36302cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx void *dwfl_arg __attribute__ ((unused)), 36402cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx void **thread_argp __attribute__ ((unused))) 36502cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx{ 36602cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx errno = ENOSYS; 36702cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx __libdwfl_seterrno (DWFL_E_ERRNO); 36802cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx return -1; 36902cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx} 37002cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx 37102cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckxstatic bool 37202cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckxpid_getthread (Dwfl *dwfl __attribute__ ((unused)), 37302cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx pid_t tid __attribute__ ((unused)), 37402cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx void *dwfl_arg __attribute__ ((unused)), 37502cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx void **thread_argp __attribute__ ((unused))) 37602cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx{ 37702cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx errno = ENOSYS; 37802cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx __libdwfl_seterrno (DWFL_E_ERRNO); 37902cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx return false; 38002cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx} 38102cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx 38202cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckxstatic bool 38302cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckxpid_memory_read (Dwfl *dwfl __attribute__ ((unused)), 38402cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx Dwarf_Addr addr __attribute__ ((unused)), 38502cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx Dwarf_Word *result __attribute__ ((unused)), 38602cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx void *arg __attribute__ ((unused))) 38702cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx{ 38802cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx errno = ENOSYS; 38902cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx __libdwfl_seterrno (DWFL_E_ERRNO); 39002cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx return false; 39102cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx} 39202cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx 39302cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckxstatic bool 39402cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckxpid_set_initial_registers (Dwfl_Thread *thread __attribute__ ((unused)), 39502cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx void *thread_arg __attribute__ ((unused))) 39602cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx{ 39702cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx errno = ENOSYS; 39802cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx __libdwfl_seterrno (DWFL_E_ERRNO); 39902cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx return false; 40002cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx} 40102cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx 40202cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckxstatic void 40302cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckxpid_detach (Dwfl *dwfl __attribute__ ((unused)), 40402cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx void *dwfl_arg __attribute__ ((unused))) 40502cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx{ 40602cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx} 40702cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx 40802cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckxstatic void 40902cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckxpid_thread_detach (Dwfl_Thread *thread __attribute__ ((unused)), 41002cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx void *thread_arg __attribute__ ((unused))) 41102cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx{ 41202cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx} 41302cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx 41402cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckxstatic const Dwfl_Thread_Callbacks pid_thread_callbacks = 41502cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx{ 41602cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx pid_next_thread, 41702cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx pid_getthread, 41802cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx pid_memory_read, 41902cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx pid_set_initial_registers, 42002cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx pid_detach, 42102cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx pid_thread_detach, 42202cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx}; 42302cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx 42402cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckxint 42502cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckxdwfl_linux_proc_attach (Dwfl *dwfl __attribute__ ((unused)), 42602cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx pid_t pid __attribute__ ((unused)), 42702cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx bool assume_ptrace_stopped __attribute__ ((unused))) 42802cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx{ 42902cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx return ENOSYS; 43002cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx} 43102cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt RoeckxINTDEF (dwfl_linux_proc_attach) 43202cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx 43302cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckxstruct __libdwfl_pid_arg * 43402cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckxinternal_function 43502cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx__libdwfl_get_pid_arg (Dwfl *dwfl __attribute__ ((unused))) 43602cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx{ 43702cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx return NULL; 43802cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx} 43902cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx 44002cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx#endif /* ! __linux __ */ 44102cefdaa6429e620d6457fdb3ad9934f194c5a93Kurt Roeckx 442