/* Copyright (C) 2003-2016 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Bao Duong <bduong@progress.com>, 2003. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #include <setjmp.h> #include <signal.h> #include <stdio.h> #include <stdlib.h> #include <sys/types.h> static sigjmp_buf jmpbuf; static void sig_handler (int signo) { siglongjmp (jmpbuf, 1); } static int do_test (void) { char *p = NULL; /* gcc can overwrite the success written value by scheduling instructions around sprintf. It is allowed to do this since according to C99 the first argument of sprintf is a character array and NULL is not a valid character array. Mark the return value as volatile so that it gets reloaded on return. */ volatile int ret = 0; if (signal (SIGSEGV, &sig_handler) == SIG_ERR) { perror ("installing SIGSEGV handler"); return 1; } puts ("Attempting to sprintf to null ptr"); if (setjmp (jmpbuf)) { puts ("Exiting main..."); return ret; } sprintf (p, "This should segv\n"); return 1; } #define TEST_FUNCTION do_test () #include "../test-skeleton.c"