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/* Test for shm_open cancellation handling: BZ #18243.
Copyright (C) 2016-2021 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 <pthread.h>
#include <sys/mman.h>
#include <semaphore.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
static sem_t sem; /* Use to sync with thread start. */
static char shm_name[sizeof "/glibc-shm_open-cancel-" + sizeof (pid_t) * 3];
static void
init_shm_name (void)
{
snprintf (shm_name, sizeof (shm_name), "/glibc-shm_open-cancel-%u",
getpid ());
}
static void
remove_shm (int status, void *arg)
{
shm_unlink (shm_name);
}
static void *
tf (void *arg)
{
pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, 0);
if (sem_wait (&sem) != 0)
{
printf ("error: sem_wait failed: %m");
exit (1);
}
if (pthread_setcancelstate (PTHREAD_CANCEL_ENABLE, 0) != 0)
{
printf ("error: pthread_setcancelstate failed: %m");
exit (1);
}
/* Neither sem_unlink or sem_open should act on thread cancellation. */
shm_unlink (shm_name);
on_exit (remove_shm, NULL);
int fd = shm_open (shm_name, O_CREAT, 0600);
if (fd == -1)
{
int exit_code;
if (errno == ENOSYS || errno == EACCES)
exit_code = 77;
else
exit_code = 1;
exit (exit_code);
}
if (pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, 0) != 0)
{
printf ("error: pthread_setcancelstate failed: %m");
exit (1);
}
if (close (fd) != 0)
{
printf ("error: pthread_setcancelstate failed: %m");
exit (1);
}
return NULL;
}
static int
do_test (void)
{
pthread_t td;
init_shm_name ();
if (sem_init (&sem, 0, 0))
{
printf ("error: sem_init failed: %m\n");
exit (1);
}
if (pthread_create (&td, NULL, tf, NULL) != 0)
{
printf ("error: pthread_create failed: %m\n");
exit (1);
}
if (pthread_cancel (td) != 0)
{
printf ("error: pthread_cancel failed: %m\n");
exit (1);
}
if (sem_post (&sem) != 0)
{
printf ("error: sem_post failed: %m\n");
exit (1);
}
void *r;
if (pthread_join (td, &r) != 0)
{
printf ("error: pthread_join failed: %m\n");
exit (1);
}
if (r == PTHREAD_CANCELED)
{
puts ("error: pthread_join returned PTHREAD_CANCELED");
exit (1);
}
return 0;
}
#define TEST_FUNCTION do_test ()
#include <test-skeleton.c>
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