gdb/testsuite/gdb.base/siginfo-thread.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2004-2019 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 */
  19
  20 #include <signal.h>
  21 #include <stdlib.h>
  22 #include <stdio.h>
  23 #include <string.h>
  24 #include <sys/mman.h>
  25 #include <unistd.h>
  26 #include <pthread.h>
  27
  28 static void *p;
  29
  30 static void
  31 handler (int sig, siginfo_t *info, void *context)
  32 {
  33   /* Copy to local vars, as the test wants to read them, and si_addr,
  34      etc. may be preprocessor defines.  */
  35   int ssi_errno = info->si_errno;
  36   int ssi_signo = info->si_signo;
  37   int ssi_code = info->si_code;
  38   void *ssi_addr = info->si_addr;
  39
  40   _exit (0); /* set breakpoint here */
  41 }
  42
  43 static void *
  44 segv_thread (void *ptr)
  45 {
  46   *(int *)ptr = 0;
  47 }
  48
  49 int
  50 main (void)
  51 {
  52   pthread_t thr;
  53
  54   /* Set up unwritable memory.  */
  55   {
  56     size_t len;
  57     len = sysconf(_SC_PAGESIZE);
  58     p = mmap (0, len, PROT_NONE, MAP_ANON|MAP_PRIVATE, -1, 0);
  59     if (p == MAP_FAILED)
  60       {
  61         perror ("mmap");
  62         return 1;
  63       }
  64   }
  65   /* Set up the signal handler.  */
  66   {
  67     struct sigaction action;
  68     memset (&action, 0, sizeof (action));
  69     action.sa_sigaction = handler;
  70     action.sa_flags |= SA_SIGINFO;
  71     if (sigaction (SIGSEGV, &action, NULL))
  72       {
  73         perror ("sigaction");
  74         return 1;
  75       }
  76   }
  77
  78   /* Create a thread that will trigger SIGSEGV.  */
  79   pthread_create (&thr, NULL, segv_thread, p);
  80
  81   pthread_join (thr, NULL);
  82
  83   return 0;
  84 }