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/* Tests for pthread_attr_setsigmask_np, pthread_attr_getsigmask_np.
Copyright (C) 2020-2024 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/>. */
/* This thread uses different masked status for SIGUSR1, SIGUSR2,
SIGHUP to determine if signal masks are applied to new threads as
expected. */
#include <signal.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <support/check.h>
#include <support/xsignal.h>
#include <support/xthread.h>
#include <threads.h>
typedef bool signals[_NSIG];
static const char *
masked_or_unmasked (bool masked)
{
if (masked)
return "masked";
else
return "unmasked";
}
/* Report an error if ACTUAL_MASK does not match EXPECTED_MASK.
CONTEXT is used in error messages. */
static void
check_sigmask (const char *context, signals expected_mask,
const sigset_t *actual_mask)
{
for (int sig = 1; sig < _NSIG; ++sig)
if (sigismember (actual_mask, sig) != expected_mask[sig])
{
support_record_failure ();
printf ("error: %s: signal %d should be %s, but is %s\n",
context, sig,
masked_or_unmasked (sigismember (actual_mask, sig)),
masked_or_unmasked (expected_mask[sig]));
}
}
/* Report an error if the current thread signal mask does not match
EXPECTED_MASK. CONTEXT is used in error messages. */
static void
check_current_sigmask (const char *context, signals expected_mask)
{
sigset_t actual_mask;
xpthread_sigmask (SIG_SETMASK, NULL, &actual_mask);
check_sigmask (context, expected_mask, &actual_mask);
}
/* Thread start routine which checks the current thread signal mask
against CLOSURE. */
static void *
check_sigmask_thread_function (void *closure)
{
check_current_sigmask ("on thread", closure);
return NULL;
}
/* Same for C11 threads. */
static int
check_sigmask_thread_function_c11 (void *closure)
{
check_current_sigmask ("on C11 thread", closure);
return 0;
}
/* Launch a POSIX thread with ATTR (which can be NULL) and check that
it has the expected signal mask. */
static void
check_posix_thread (pthread_attr_t *attr, signals expected_mask)
{
xpthread_join (xpthread_create (attr, check_sigmask_thread_function,
expected_mask));
}
/* Launch a C11 thread and check that it has the expected signal
mask. */
static void
check_c11_thread (signals expected_mask)
{
thrd_t thr;
TEST_VERIFY_EXIT (thrd_create (&thr, check_sigmask_thread_function_c11,
expected_mask) == thrd_success);
TEST_VERIFY_EXIT (thrd_join (thr, NULL) == thrd_success);
}
static int
do_test (void)
{
check_current_sigmask ("initial mask", (signals) { false, });
check_posix_thread (NULL, (signals) { false, });
check_c11_thread ((signals) { false, });
sigset_t set;
sigemptyset (&set);
sigaddset (&set, SIGUSR1);
xpthread_sigmask (SIG_SETMASK, &set, NULL);
check_current_sigmask ("SIGUSR1 masked", (signals) { [SIGUSR1] = true, });
/* The signal mask is inherited by the new thread. */
check_posix_thread (NULL, (signals) { [SIGUSR1] = true, });
check_c11_thread ((signals) { [SIGUSR1] = true, });
pthread_attr_t attr;
xpthread_attr_init (&attr);
TEST_COMPARE (pthread_attr_getsigmask_np (&attr, &set),
PTHREAD_ATTR_NO_SIGMASK_NP);
/* By default, the signal mask is inherited (even with an explicit
thread attribute). */
check_posix_thread (&attr, (signals) { [SIGUSR1] = true, });
/* Check that pthread_attr_getsigmask_np can obtain the signal
mask. */
sigemptyset (&set);
sigaddset (&set, SIGUSR2);
TEST_COMPARE (pthread_attr_setsigmask_np (&attr, &set), 0);
sigemptyset (&set);
TEST_COMPARE (pthread_attr_getsigmask_np (&attr, &set), 0);
check_sigmask ("pthread_attr_getsigmask_np", (signals) { [SIGUSR2] = true, },
&set);
/* Check that a thread is launched with the configured signal
mask. */
check_current_sigmask ("SIGUSR1 masked", (signals) { [SIGUSR1] = true, });
check_posix_thread (&attr, (signals) { [SIGUSR2] = true, });
check_current_sigmask ("SIGUSR1 masked", (signals) { [SIGUSR1] = true, });
/* But C11 threads remain at inheritance. */
check_c11_thread ((signals) { [SIGUSR1] = true, });
/* Check that filling the original signal set does not affect thread
creation. */
sigfillset (&set);
check_posix_thread (&attr, (signals) { [SIGUSR2] = true, });
/* Check that clearing the signal in the attribute restores
inheritance. */
TEST_COMPARE (pthread_attr_setsigmask_np (&attr, NULL), 0);
TEST_COMPARE (pthread_attr_getsigmask_np (&attr, &set),
PTHREAD_ATTR_NO_SIGMASK_NP);
check_posix_thread (&attr, (signals) { [SIGUSR1] = true, });
/* Mask SIGHUP via the default thread attribute. */
sigemptyset (&set);
sigaddset (&set, SIGHUP);
TEST_COMPARE (pthread_attr_setsigmask_np (&attr, &set), 0);
TEST_COMPARE (pthread_setattr_default_np (&attr), 0);
/* Check that the mask was applied to the default attribute. */
xpthread_attr_destroy (&attr);
TEST_COMPARE (pthread_getattr_default_np (&attr), 0);
sigaddset (&set, SIGHUP);
TEST_COMPARE (pthread_attr_getsigmask_np (&attr, &set), 0);
check_sigmask ("default attribute", (signals) { [SIGHUP] = true, }, &set);
xpthread_attr_destroy (&attr);
/* Check that the default attribute is applied. */
check_posix_thread (NULL, (signals) { [SIGHUP] = true, });
check_c11_thread ((signals) { [SIGHUP] = true, });
/* An explicit attribute with no signal mask triggers inheritance
even if the default has been changed. */
xpthread_attr_init (&attr);
check_posix_thread (&attr, (signals) { [SIGUSR1] = true, });
/* Explicitly setting the signal mask affects the new thread even
with a default attribute. */
sigemptyset (&set);
sigaddset (&set, SIGUSR2);
TEST_COMPARE (pthread_attr_setsigmask_np (&attr, &set), 0);
check_posix_thread (&attr, (signals) { [SIGUSR2] = true, });
/* Resetting the default attribute brings back the old inheritance
behavior. */
xpthread_attr_destroy (&attr);
xpthread_attr_init (&attr);
TEST_COMPARE (pthread_setattr_default_np (&attr), 0);
xpthread_attr_destroy (&attr);
check_posix_thread (NULL, (signals) { [SIGUSR1] = true, });
check_c11_thread ((signals) { [SIGUSR1] = true, });
return 0;
}
#include <support/test-driver.c>
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