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

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2004, 2007, 2008, 2009 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 <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <sys/mman.h>
  25 #include <unistd.h>
  26
  27 static void *p;
  28
  29 static void
  30 handler (int sig, siginfo_t *info, void *context)
  31 {
  32   if (info->si_addr == p)
  33     printf ("Correct si_addr value.\n");
  34   else
  35     printf ("Got si_addr = %p, expected %p.\n", info->si_addr, p);
  36   _exit (0);
  37 }
  38
  39 int
  40 main (void)
  41 {
  42   /* Set up unwritable memory.  */
  43   {
  44     size_t len;
  45     len = sysconf(_SC_PAGESIZE);
  46     p = mmap (0, len, PROT_NONE, MAP_ANON|MAP_PRIVATE, -1, 0);
  47     if (p == MAP_FAILED)
  48       {
  49         perror ("mmap");
  50         return 1;
  51       }
  52   }
  53   /* Set up the signal handler.  */
  54   {
  55     struct sigaction action;
  56     memset (&action, 0, sizeof (action));
  57     action.sa_sigaction = handler;
  58     action.sa_flags |= SA_SIGINFO;
  59     if (sigaction (SIGSEGV, &action, NULL))
  60       {
  61         perror ("sigaction");
  62         return 1;
  63       }
  64   }
  65   /* Trigger SIGSEGV.  */
  66   *(int *)p = 0;
  67   return 0;
  68 }