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/* Test that libsigsegv does not interfere with fault handling inside
system calls.
Copyright (C) 2009-2010 Eric Blake <ebb9@byu.net>
Copyright (C) 2021 Bruno Haible <bruno@clisp.org>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#ifndef _MSC_VER
# include <config.h>
#endif
#include "sigsegv.h"
#if HAVE_STACK_OVERFLOW_RECOVERY && HAVE_EFAULT_SUPPORT
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "altstack-util.h"
/* A NULL pointer.
If we were to use a literal NULL, gcc would give a warning on glibc systems:
"warning: null argument where non-null required". */
const char *null_pointer = NULL;
static void
handler (int emergency, stackoverflow_context_t scp)
{
/* This test is only enabled when ENABLE_EFAULT is true. If we get here,
the ENABLE_EFAULT handling in libsigsegv is incomplete. */
abort ();
}
int
main ()
{
/* Test whether the OS handles some faults by itself. */
if (open (null_pointer, O_RDONLY) != -1 || errno != EFAULT)
{
fprintf (stderr, "EFAULT not detected alone.\n");
exit (1);
}
/* Prepare the storage for the alternate stack. */
prepare_alternate_stack ();
/* Install the stack overflow handler. */
if (stackoverflow_install_handler (&handler, mystack, SIGSTKSZ) < 0)
exit (2);
/* Test that the library does not interfere with OS faults. */
if (open (null_pointer, O_RDONLY) != -1 || errno != EFAULT)
{
fprintf (stderr, "EFAULT not detected with handler.\n");
exit (1);
}
/* Validate that the alternate stack did not overflow. */
check_alternate_stack_no_overflow ();
/* Test passed! */
printf ("Test passed.\n");
return 0;
}
#else
int
main ()
{
return 77;
}
#endif
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