1 /* This testcase is part of GDB, the GNU debugger. 2 3 Copyright 2004-2015 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 27 static void *p; 28 29 static void 30 handler (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 39 int 40 main (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