1 /* This testcase is part of GDB, the GNU debugger. 2 3 Copyright 2004-2023 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 <stdio.h> 23 #include <string.h> 24 #include <sys/mman.h> 25 #include <unistd.h> 26 #include <pthread.h> 27 28 static void *p; 29 30 static void 31 handler (int sig, siginfo_t *info, void *context) 32 { 33 /* Copy to local vars, as the test wants to read them, and si_addr, 34 etc. may be preprocessor defines. */ 35 int ssi_errno = info->si_errno; 36 int ssi_signo = info->si_signo; 37 int ssi_code = info->si_code; 38 void *ssi_addr = info->si_addr; 39 40 _exit (0); /* set breakpoint here */ 41 } 42 43 static void * 44 segv_thread (void *ptr) 45 { 46 *(int *)ptr = 0; 47 } 48 49 int 50 main (void) 51 { 52 pthread_t thr; 53 54 /* Set up unwritable memory. */ 55 { 56 size_t len; 57 len = sysconf(_SC_PAGESIZE); 58 p = mmap (0, len, PROT_NONE, MAP_ANON|MAP_PRIVATE, -1, 0); 59 if (p == MAP_FAILED) 60 { 61 perror ("mmap"); 62 return 1; 63 } 64 } 65 /* Set up the signal handler. */ 66 { 67 struct sigaction action; 68 memset (&action, 0, sizeof (action)); 69 action.sa_sigaction = handler; 70 action.sa_flags |= SA_SIGINFO; 71 if (sigaction (SIGSEGV, &action, NULL)) 72 { 73 perror ("sigaction"); 74 return 1; 75 } 76 } 77 78 /* Create a thread that will trigger SIGSEGV. */ 79 pthread_create (&thr, NULL, segv_thread, p); 80 81 pthread_join (thr, NULL); 82 83 return 0; 84 } 85