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/* Check if a thread that disables cancellation and which call functions
that might be interrupted by a signal do not see the internal SIGCANCEL.
Copyright (C) 2022-2025 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 <array_length.h>
#include <errno.h>
#include <inttypes.h>
#include <poll.h>
#include <support/check.h>
#include <support/support.h>
#include <support/temp_file.h>
#include <support/xthread.h>
#include <sys/socket.h>
#include <signal.h>
#include <stdio.h>
#include <unistd.h>
/* On Linux some interfaces are never restarted after being interrupted by
a signal handler, regardless of the use of SA_RESTART. It means that
if asynchronous cancellation is not enabled, the pthread_cancel can not
set the internal SIGCANCEL otherwise the interface might see a spurious
EINTR failure. */
static pthread_barrier_t b;
/* Cleanup handling test. */
static int cl_called;
static void
cl (void *arg)
{
++cl_called;
}
static void *
tf_sigtimedwait (void *arg)
{
pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, NULL);
xpthread_barrier_wait (&b);
int r;
pthread_cleanup_push (cl, NULL);
sigset_t mask;
sigemptyset (&mask);
r = sigtimedwait (&mask, NULL, &(struct timespec) { 0, 250000000 });
if (r != -1)
return (void*) -1;
if (errno != EAGAIN)
return (void*) -2;
pthread_cleanup_pop (0);
return NULL;
}
static void *
tf_poll (void *arg)
{
pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, NULL);
xpthread_barrier_wait (&b);
int r;
pthread_cleanup_push (cl, NULL);
r = poll (NULL, 0, 250);
if (r != 0)
return (void*) -1;
pthread_cleanup_pop (0);
return NULL;
}
static void *
tf_ppoll (void *arg)
{
pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, NULL);
xpthread_barrier_wait (&b);
int r;
pthread_cleanup_push (cl, NULL);
r = ppoll (NULL, 0, &(struct timespec) { 0, 250000000 }, NULL);
if (r != 0)
return (void*) -1;
pthread_cleanup_pop (0);
return NULL;
}
static void *
tf_select (void *arg)
{
pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, NULL);
xpthread_barrier_wait (&b);
int r;
pthread_cleanup_push (cl, NULL);
r = select (0, NULL, NULL, NULL, &(struct timeval) { 0, 250000 });
if (r != 0)
return (void*) -1;
pthread_cleanup_pop (0);
return NULL;
}
static void *
tf_pselect (void *arg)
{
pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, NULL);
xpthread_barrier_wait (&b);
int r;
pthread_cleanup_push (cl, NULL);
r = pselect (0, NULL, NULL, NULL, &(struct timespec) { 0, 250000000 }, NULL);
if (r != 0)
return (void*) -1;
pthread_cleanup_pop (0);
return NULL;
}
static void *
tf_clock_nanosleep (void *arg)
{
pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, NULL);
xpthread_barrier_wait (&b);
int r;
pthread_cleanup_push (cl, NULL);
r = clock_nanosleep (CLOCK_REALTIME, 0, &(struct timespec) { 0, 250000000 },
NULL);
if (r != 0)
return (void*) -1;
pthread_cleanup_pop (0);
return NULL;
}
struct cancel_test_t
{
const char *name;
void * (*cf) (void *);
} tests[] =
{
{ "sigtimedwait", tf_sigtimedwait, },
{ "poll", tf_poll, },
{ "ppoll", tf_ppoll, },
{ "select", tf_select, },
{ "pselect", tf_pselect , },
{ "clock_nanosleep", tf_clock_nanosleep, },
};
static int
do_test (void)
{
for (int i = 0; i < array_length (tests); i++)
{
xpthread_barrier_init (&b, NULL, 2);
cl_called = 0;
pthread_t th = xpthread_create (NULL, tests[i].cf, NULL);
xpthread_barrier_wait (&b);
struct timespec ts = { .tv_sec = 0, .tv_nsec = 100000000 };
while (nanosleep (&ts, &ts) != 0)
continue;
xpthread_cancel (th);
void *status = xpthread_join (th);
if (status != NULL)
printf ("test '%s' failed: %" PRIdPTR "\n", tests[i].name,
(intptr_t) status);
TEST_VERIFY (status == NULL);
xpthread_barrier_destroy (&b);
TEST_COMPARE (cl_called, 0);
printf ("in-time cancel test of '%s' successful\n", tests[i].name);
}
return 0;
}
#include <support/test-driver.c>
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