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/* This testcase is part of GDB, the GNU debugger.
Copyright 2004-2021 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <unistd.h>
static void *p;
void
pass (void)
{
}
static void
handler (int sig, siginfo_t *info, void *context)
{
if (info->si_addr == p)
pass ();
_exit (0);
}
int
main (void)
{
/* Set up unwritable memory. */
{
size_t len;
len = sysconf(_SC_PAGESIZE);
p = mmap (0, len, PROT_NONE, MAP_ANON|MAP_PRIVATE, -1, 0);
if (p == MAP_FAILED)
{
perror ("mmap");
return 1;
}
}
/* Set up the signal handler. */
{
struct sigaction action;
memset (&action, 0, sizeof (action));
action.sa_sigaction = handler;
action.sa_flags |= SA_SIGINFO;
if (sigaction (SIGSEGV, &action, NULL))
{
perror ("sigaction");
return 1;
}
}
/* Trigger SIGSEGV. */
*(int *)p = 0;
return 0;
}
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