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1998-07-20 17:09 Ulrich Drepper <drepper@cygnus.com> * shlib-versions: Remove definition for libSegFault. * memory.texi: Comment out the relocating allocator description. * manual/signal.texi: Remove reference to relocating allocator. * manual/top-menu.texi: Regenerated. * posix/fnmatch.c: Implement [: :] and change to recognize ^ as negation only when not _POSIXLY_CORRECT. * sysdeps/generic/glob.c: Add several optimizations. * posix/glob.h: Undefine __PMT to prevent warnings. Reported by Roland McGrath. * posix/regex.c: Define namespace macros only for _LIBC. * sysdeps/arm/dl-machine.h: Fix typo. * sysdeps/unix/sysv/sysv4/solaris2/sigpending.c: New file. * sysdeps/unix/sysv/sysv4/solaris2/sigstack.c: New file. * sysdeps/unix/sysv/sysv4/solaris2/sigwaitinfo.c: New file. * sysdeps/unix/sysv/sysv4/solaris2/syscalls.list: Add sigaltstack, sigpending, sigqueue, and sigtimedwait. * sysdeps/unix/sysv/sysv4/solaris2/sparc/sparc32/syscall.S: New file. * timezone/leapseconds: Update from tzdata1998f. 1998-07-18 Mark Kettenis <kettenis@phys.uva.nl> * stdio/stdio.h [__USE_GNU]: Add prototype for fputs_unlocked. * stdio/Versions [GLIBC_2.1]: Add fputs_unlocked. * libio/stdio.h: Fix typo. 1998-07-19 Roland McGrath <roland@baalperazim.frob.com> * sysdeps/mach/hurd/dl-sysdep.c (_dl_sysdep_start): #if 0 out the magic memobj port arg parsing stuff. Fix it someday when we are ready to really use it. (_dl_sysdep_output): New function, modified from _dl_sysdep_error. (_dl_sysdep_error, _dl_sysdep_message, _dl_sysdep_fatal): Removed. 1998-07-19 Roland McGrath <roland@baalperazim.frob.com> * stdio/fputs.c: Add fputs_unlocked as weak alias for fputs. 1998-07-19 Roland McGrath <roland@baalperazim.frob.com> * sysdeps/posix/sigsuspend.c: Define __sigsuspend with sigsuspend as a weak alias. * sysdeps/mach/hurd/sigsuspend.c: Likewise. * sysdeps/generic/sigsuspend.c: Likewise. 1998-07-19 Roland McGrath <roland@baalperazim.frob.com> * sysdeps/mach/hurd/i386/sigcontextinfo.h: New file. 1998-07-19 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * Makerules (map-file): Don't use $(wildcard) to find the generated version script, instead look in $(version-maps). ($(common-objpfx)libc.so): Only depend on libc.map if versioning is used. * extra-lib.mk ($(objpfx)$(lib).so): Only depend on version script if versioning is used. Don't use $(wildcard) to find the generated version script, instead look in $(verson-maps). 1998-07-17 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sysdeps/generic/segfault.c: Rename GET_EIP to GET_PC. Remove unused function handle. * sysdeps/generic/sigcontextinfo.h: Rename GET_EIP to GET_PC. * sysdeps/unix/sysv/linux/i386/sigcontextinfo.h: Likewise. * debug/catchsegv.sh: Fix argument processing, quoting and various typos. Put the crash info always in the current directory. Find program in $PATH if it contains no directory component. * Makerules (install-lib.so-versioned, install-lib.so-unversioned): New variables. (install-lib-nosubdir): Depend on unversioned libs in slibdir, not libdir. 1998-07-19 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * Make-dist (+tsrcs): Remove references to %-map variables and *.map files. Add Versions in subdirs. * Makerules (distinfo-vars): Don't write out %-map variables. 1998-07-20 13:55 Ulrich Drepper <drepper@cygnus.com> * inet/protocols/rwhod.h: Remove definition of _PATH_RWHODIR. Include <paths.h> instead. * sysdeps/generic/paths.h: Define _PATH_RWHODIR. * sysdeps/unix/sysv/linux/paths.h: Likewise. Reported by Dale Scheetz <dwarf@polaris.net>. 1998-07-17 21:44 Ulrich Drepper <drepper@cygnus.com> * catgets/open_catalog.c: Strictly check whether catalog file is larger enough for the data. Reported by Andries.Brouwer@cwi.nl.
160 lines
4.4 KiB
C
160 lines
4.4 KiB
C
/* Catch segmentation faults and print backtrace.
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Copyright (C) 1998 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <execinfo.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <unistd.h>
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/* This file defines macros to access the content of the sigcontext element
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passed up by the signal handler. */
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#include <sigcontextinfo.h>
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/* This is a global variable set at program start time. It marks the
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highest used stack address. */
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extern void *__libc_stack_end;
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/* This implementation assumes a stack layout that matches the defaults
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used by gcc's `__builtin_frame_address' and `__builtin_return_address'
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(FP is the frame pointer register):
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+-----------------+ +-----------------+
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FP -> | previous FP --------> | previous FP ------>...
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| | | |
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| return address | | return address |
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+-----------------+ +-----------------+
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*/
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/* Get some notion of the current stack. Need not be exactly the top
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of the stack, just something somewhere in the current frame. */
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#ifndef CURRENT_STACK_FRAME
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# define CURRENT_STACK_FRAME ({ char __csf; &__csf; })
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#endif
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/* By default we assume that the stack grows downward. */
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#ifndef INNER_THAN
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# define INNER_THAN <
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#endif
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struct layout
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{
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struct layout *next;
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void *return_address;
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};
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/* This function is called when a segmentation fault is caught. The system
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is in an instable state now. This means especially that malloc() might
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not work anymore. */
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static void
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catch_segfault (int signal, SIGCONTEXT ctx)
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{
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struct layout *current;
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void *top_frame;
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void *top_stack;
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const char *fname;
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int fd;
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void **arr;
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size_t cnt;
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/* This is the name of the file we are writing to. If none is given
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or we cannot write to this file write to stderr. */
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fd = 2;
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fname = getenv ("SEGFAULT_OUTPUT_NAME");
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if (fname != NULL && fname[0] != '\0')
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{
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fd = open (fname, O_TRUNC | O_WRONLY | O_CREAT);
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if (fd == -1)
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fd = 2;
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}
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#define WRITE_STRING(s) write (fd, s, sizeof (s) - 1)
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WRITE_STRING ("*** Segmentation Fault\n");
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WRITE_STRING ("Backtrace:\n");
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top_frame = GET_FRAME (ctx);
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top_stack = GET_STACK (ctx);
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/* First count how many entries we'll have. */
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cnt = 1;
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current = (struct layout *) top_frame;
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while (!((void *) current INNER_THAN top_stack
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|| !((void *) current INNER_THAN __libc_stack_end)))
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{
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++cnt;
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current = current->next;
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}
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arr = alloca (cnt * sizeof (void *));
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/* First handle the program counter from the structure. */
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arr[0] = GET_PC (ctx);
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current = (struct layout *) top_frame;
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cnt = 1;
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while (!((void *) current INNER_THAN top_stack
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|| !((void *) current INNER_THAN __libc_stack_end)))
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{
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arr[cnt++] = current->return_address;
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current = current->next;
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}
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/* Now generate nicely formatted output. */
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__backtrace_symbols_fd (arr, cnt, fd);
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/* Nothing else to do. */
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_exit (128 + SIGSEGV);
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}
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static void
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__attribute__ ((constructor))
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install_handler (void)
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{
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struct sigaction sa;
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sa.sa_handler = (void *) catch_segfault;
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sigemptyset (&sa.sa_mask);
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sa.sa_flags = SA_RESTART;
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sigaction (SIGSEGV, &sa, NULL);
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/* Maybe we are expected to use an alternative stack. */
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if (getenv ("SEGFAULT_USE_ALTSTACK") != 0)
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{
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void *stack_mem = malloc (2 * SIGSTKSZ);
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struct sigaltstack ss;
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if (stack_mem != NULL)
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{
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ss.ss_sp = stack_mem;
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ss.ss_flags = SS_ONSTACK;
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ss.ss_size = 2 * SIGSTKSZ;
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sigaltstack (&ss, NULL);
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}
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}
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}
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