mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 21:10:07 +00:00
66 lines
2.2 KiB
C
66 lines
2.2 KiB
C
/* Tests of signal delivery on an alternate stack (quick_exit).
|
|
Copyright (C) 2019-2020 Free Software Foundation, Inc.
|
|
This file is part of 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/>. */
|
|
|
|
#include <support/xsignal.h>
|
|
#include <support/support.h>
|
|
#include <support/check.h>
|
|
#include <stdlib.h>
|
|
|
|
/* C2011 7.4.1.1p5 specifies that only the following operations are
|
|
guaranteed to be well-defined inside an asynchronous signal handler:
|
|
* any operation on a lock-free atomic object
|
|
* assigning a value to an object declared as volatile sig_atomic_t
|
|
* calling abort, _Exit, quick_exit, or signal
|
|
* signal may only be called with its first argument equal to the
|
|
number of the signal that caused the handler to be called
|
|
|
|
We use this list as a guideline for the set of operations that ought
|
|
also to be safe in a _synchronous_ signal delivered on an alternate
|
|
signal stack with only MINSIGSTKSZ bytes of space.
|
|
|
|
This test program tests calls to quick_exit. Note that this is only
|
|
safe when there are no at_quick_exit callbacks. */
|
|
|
|
#define EXPECTED_STATUS 3
|
|
|
|
static void
|
|
handler (int unused)
|
|
{
|
|
quick_exit (EXPECTED_STATUS);
|
|
}
|
|
|
|
int
|
|
do_test (void)
|
|
{
|
|
void *sstk = xalloc_sigstack (0);
|
|
struct sigaction sa;
|
|
|
|
sa.sa_handler = handler;
|
|
sa.sa_flags = SA_RESTART | SA_ONSTACK;
|
|
sigfillset (&sa.sa_mask);
|
|
if (sigaction (SIGUSR1, &sa, 0))
|
|
FAIL_RET ("sigaction (SIGUSR1, handler): %m\n");
|
|
|
|
raise (SIGUSR1);
|
|
|
|
xfree_sigstack (sstk);
|
|
FAIL_RET ("test process was not terminated by quick_exit in signal handler");
|
|
}
|
|
|
|
#include <support/test-driver.c>
|