1/* This testcase is part of GDB, the GNU debugger.
2
3   Copyright 2004, 2007, 2008, 2009, 2010, 2011 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
27static void *p;
28
29static void
30handler (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
39int
40main (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}
69