gdb/testsuite/gdb.base/siginfo-addr.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 <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 void
  30 pass (void)
  31 {
  32 }
  33
  34 static void
  35 handler (int sig, siginfo_t *info, void *context)
  36 {
  37   if (info->si_addr == p)
  38     pass ();
  39   _exit (0);
  40 }
  41
  42 int
  43 main (void)
  44 {
  45   /* Set up unwritable memory.  */
  46   {
  47     size_t len;
  48     len = sysconf(_SC_PAGESIZE);
  49     p = mmap (0, len, PROT_NONE, MAP_ANON|MAP_PRIVATE, -1, 0);
  50     if (p == MAP_FAILED)
  51       {
  52         perror ("mmap");
  53         return 1;
  54       }
  55   }
  56   /* Set up the signal handler.  */
  57   {
  58     struct sigaction action;
  59     memset (&action, 0, sizeof (action));
  60     action.sa_sigaction = handler;
  61     action.sa_flags |= SA_SIGINFO;
  62     if (sigaction (SIGSEGV, &action, NULL))
  63       {
  64         perror ("sigaction");
  65         return 1;
  66       }
  67   }
  68   /* Trigger SIGSEGV.  */
  69   *(int *)p = 0;
  70   return 0;
  71 }