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 <stdlib.h> 22 #include <string.h> 23 #include <sys/mman.h> 24 #include <unistd.h> 25 26 static void *p; 27 28 static void 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 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