84 lines
2 KiB
C
84 lines
2 KiB
C
/* This testcase is part of GDB, the GNU debugger.
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Copyright 2004-2016 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <signal.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include <pthread.h>
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static void *p;
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static void
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handler (int sig, siginfo_t *info, void *context)
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{
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/* Copy to local vars, as the test wants to read them, and si_addr,
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etc. may be preprocessor defines. */
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int ssi_errno = info->si_errno;
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int ssi_signo = info->si_signo;
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int ssi_code = info->si_code;
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void *ssi_addr = info->si_addr;
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_exit (0); /* set breakpoint here */
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}
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static void *
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segv_thread (void *ptr)
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{
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*(int *)ptr = 0;
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}
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int
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main (void)
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{
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pthread_t thr;
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/* Set up unwritable memory. */
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{
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size_t len;
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len = sysconf(_SC_PAGESIZE);
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p = mmap (0, len, PROT_NONE, MAP_ANON|MAP_PRIVATE, -1, 0);
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if (p == MAP_FAILED)
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{
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perror ("mmap");
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return 1;
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}
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}
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/* Set up the signal handler. */
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{
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struct sigaction action;
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memset (&action, 0, sizeof (action));
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action.sa_sigaction = handler;
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action.sa_flags |= SA_SIGINFO;
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if (sigaction (SIGSEGV, &action, NULL))
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{
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perror ("sigaction");
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return 1;
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}
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}
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/* Create a thread that will trigger SIGSEGV. */
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pthread_create (&thr, NULL, segv_thread, p);
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pthread_join (thr, NULL);
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return 0;
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}
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