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/* Check that sigwait does not fail with EINTR (bug 22478).
Copyright (C) 2017-2022 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 <errno.h>
#include <signal.h>
#include <stdio.h>
#include <support/check.h>
#include <support/xunistd.h>
#include <time.h>
#include <unistd.h>
/* Handler for SIGUSR1. */
static void
sigusr1_handler (int signo)
{
TEST_VERIFY (signo == SIGUSR1);
}
/* Spawn a subprocess to send two signals: First SIGUSR1, then
SIGUSR2. Return the PID of the process. */
static pid_t
signal_sender (void)
{
pid_t pid = xfork ();
if (pid == 0)
{
static const struct timespec delay = { 1, };
if (nanosleep (&delay, NULL) != 0)
FAIL_EXIT1 ("nanosleep: %m");
if (kill (getppid (), SIGUSR1) != 0)
FAIL_EXIT1 ("kill (SIGUSR1): %m");
if (nanosleep (&delay, NULL) != 0)
FAIL_EXIT1 ("nanosleep: %m");
if (kill (getppid (), SIGUSR2) != 0)
FAIL_EXIT1 ("kill (SIGUSR2): %m");
_exit (0);
}
return pid;
}
static int
do_test (void)
{
if (signal (SIGUSR1, sigusr1_handler) == SIG_ERR)
FAIL_EXIT1 ("signal (SIGUSR1): %m\n");
sigset_t sigs;
sigemptyset (&sigs);
sigaddset (&sigs, SIGUSR2);
if (sigprocmask (SIG_BLOCK, &sigs, NULL) != 0)
FAIL_EXIT1 ("sigprocmask (SIGBLOCK, SIGUSR2): %m");
pid_t pid = signal_sender ();
int signo = 0;
int ret = sigwait (&sigs, &signo);
if (ret != 0)
{
support_record_failure ();
errno = ret;
printf ("error: sigwait failed: %m (%d)\n", ret);
}
TEST_VERIFY (signo == SIGUSR2);
int status;
xwaitpid (pid, &status, 0);
TEST_VERIFY (status == 0);
return 0;
}
#include <support/test-driver.c>
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