1 /* This testcase is part of GDB, the GNU debugger.
2
3 Copyright 2004-2013 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
26 static void *p;
27
28 static void
handler(int sig,siginfo_t * info,void * context)29 handler (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
41 int
main(void)42 main (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