1/* This testcase is part of GDB, the GNU debugger.
2
3   Copyright 2004, 2007, 2008, 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 <stdlib.h>
22#include <string.h>
23#include <sys/mman.h>
24#include <unistd.h>
25
26static void *p;
27
28static void
29handler (int sig, siginfo_t *info, void *context)
30{
31  /* Copy to local vars, as the test wants to read them, and si_addr,
32     etc. may be preprocessor defines.  */
33  int ssi_errno = info->si_errno;
34  int ssi_signo = info->si_signo;
35  int ssi_code = info->si_code;
36  void *ssi_addr = info->si_addr;
37
38  _exit (0); /* set breakpoint here */
39}
40
41int
42main (void)
43{
44  /* Set up unwritable memory.  */
45  {
46    size_t len;
47    len = sysconf(_SC_PAGESIZE);
48    p = mmap (0, len, PROT_NONE, MAP_ANON|MAP_PRIVATE, -1, 0);
49    if (p == MAP_FAILED)
50      {
51	perror ("mmap");
52	return 1;
53      }
54  }
55  /* Set up the signal handler.  */
56  {
57    struct sigaction action;
58    memset (&action, 0, sizeof (action));
59    action.sa_sigaction = handler;
60    action.sa_flags |= SA_SIGINFO;
61    if (sigaction (SIGSEGV, &action, NULL))
62      {
63	perror ("sigaction");
64	return 1;
65      }
66  }
67  /* Trigger SIGSEGV.  */
68  *(int *)p = 0;
69  return 0;
70}
71