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/* Copyright (C) 2004-2020 Free Software Foundation, Inc.
This snippet is taken from debug/tst-chk1 in the GNU C Library.
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
<https://www.gnu.org/licenses/>. */
#define _POSIX_C_SOURCE 2
#define _XOPEN_SOURCE 700
#include <setjmp.h>
#include <unistd.h>
#include <signal.h>
#include <stdio.h>
#ifndef _FORTIFY_HEADERS_H
#error Never included fortify-headers.h
#endif
volatile int chk_fail_ok;
volatile int ret;
jmp_buf chk_fail_buf;
static void
handler (int sig)
{
if (chk_fail_ok)
{
chk_fail_ok = 0;
longjmp (chk_fail_buf, 1);
}
else
_exit (127);
}
void
__attribute__((constructor))
set_fortify_handler (void)
{
struct sigaction sa;
sa.sa_handler = handler;
sa.sa_flags = 0;
sigemptyset (&sa.sa_mask);
sigaction (SIGILL, &sa, NULL);
sigaction (SIGTRAP, &sa, NULL);
}
#define FAIL() \
do { fprintf (stderr, "Failure in %s:%d\n", __FILE__, __LINE__); ret = 1; } while (0)
#define CHK_FAIL_START \
chk_fail_ok = 1; \
if (! setjmp (chk_fail_buf)) \
{
#define CHK_FAIL_END \
chk_fail_ok = 0; \
FAIL (); \
}
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