/* This testcase is part of GDB, the GNU debugger. Copyright 2004-2014 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; static void handler (int sig, siginfo_t *info, void *context) { if (info->si_addr == p) printf ("Correct si_addr value.\n"); else printf ("Got si_addr = %p, expected %p.\n", info->si_addr, p); _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; }