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/* Test of sigaction() function.
Copyright (C) 2008-2022 Free Software Foundation, Inc.
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 3 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/>. */
/* Written by Eric Blake <ebb9@byu.net>, 2008. */
#include <config.h>
#include <signal.h>
#include "signature.h"
SIGNATURE_CHECK (sigaction, int, (int, struct sigaction const *,
struct sigaction *));
#include <stddef.h>
#include "macros.h"
#ifndef SA_NOCLDSTOP
# define SA_NOCLDSTOP 0
#endif
#ifndef SA_ONSTACK
# define SA_ONSTACK 0
#endif
#ifndef SA_RESETHAND
# define SA_RESETHAND 0
#endif
#ifndef SA_RESTART
# define SA_RESTART 0
#endif
#ifndef SA_SIGINFO
# define SA_SIGINFO 0
#endif
#ifndef SA_NOCLDWAIT
# define SA_NOCLDWAIT 0
#endif
/* Define a mask of flags required by POSIX. Some implementations
provide other flags as extensions, such as SA_RESTORER, that we
must ignore in this test. */
#define MASK_SA_FLAGS (SA_NOCLDSTOP | SA_ONSTACK | SA_RESETHAND | SA_RESTART \
| SA_SIGINFO | SA_NOCLDWAIT | SA_NODEFER)
/* This test is unsafe in the presence of an asynchronous SIGABRT,
because we install a signal-handler that is intentionally not
async-safe. Hopefully, this does not lead to too many reports of
false failures, since people don't generally use 'kill -s SIGABRT'
to end a runaway program. */
static void
handler (int sig)
{
static int entry_count;
struct sigaction sa;
ASSERT (sig == SIGABRT);
ASSERT (sigaction (SIGABRT, NULL, &sa) == 0);
ASSERT ((sa.sa_flags & SA_SIGINFO) == 0);
switch (entry_count++)
{
case 0:
ASSERT ((sa.sa_flags & SA_RESETHAND) == 0);
ASSERT (sa.sa_handler == handler);
break;
case 1:
/* This assertion fails on glibc-2.3.6 systems with LinuxThreads,
when this program is linked with -lpthread, due to the sigaction()
override in libpthread.so. */
#if !(defined __GLIBC__ || defined __UCLIBC__)
ASSERT (sa.sa_handler == SIG_DFL);
#endif
break;
default:
ASSERT (0);
}
}
int
main (void)
{
struct sigaction sa;
struct sigaction old_sa;
sa.sa_handler = handler;
sa.sa_flags = 0;
ASSERT (sigemptyset (&sa.sa_mask) == 0);
ASSERT (sigaction (SIGABRT, &sa, NULL) == 0);
ASSERT (raise (SIGABRT) == 0);
sa.sa_flags = SA_RESETHAND | SA_NODEFER;
ASSERT (sigaction (SIGABRT, &sa, &old_sa) == 0);
ASSERT ((old_sa.sa_flags & MASK_SA_FLAGS) == 0);
ASSERT (old_sa.sa_handler == handler);
ASSERT (raise (SIGABRT) == 0);
sa.sa_handler = SIG_DFL;
ASSERT (sigaction (SIGABRT, &sa, &old_sa) == 0);
ASSERT ((old_sa.sa_flags & SA_SIGINFO) == 0);
#if !(defined __GLIBC__ || defined __UCLIBC__) /* see above */
ASSERT (old_sa.sa_handler == SIG_DFL);
#endif
sa.sa_handler = SIG_IGN;
ASSERT (sigaction (SIGABRT, &sa, NULL) == 0);
ASSERT (raise (SIGABRT) == 0);
ASSERT (sigaction (SIGABRT, NULL, &old_sa) == 0);
ASSERT (old_sa.sa_handler == SIG_IGN);
ASSERT (raise (SIGABRT) == 0);
return 0;
}
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