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/* Test SIGEV_THREAD handling for POSIX message queues.
Copyright (C) 2004-2024 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/>. */
#include <errno.h>
#include <mqueue.h>
#include <signal.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <unistd.h>
#include <support/check.h>
#if _POSIX_THREADS
# include <pthread.h>
static pid_t pid;
static mqd_t m;
static const char message[] = "hello";
# define MAXMSG 10
# define MSGSIZE 10
# define UNIQUE 42
static void
fct (union sigval s)
{
/* Put the mq in non-blocking mode. */
struct mq_attr attr;
if (mq_getattr (m, &attr) != 0)
{
printf ("%s: mq_getattr failed: %m\n", __FUNCTION__);
exit (1);
}
attr.mq_flags |= O_NONBLOCK;
if (mq_setattr (m, &attr, NULL) != 0)
{
printf ("%s: mq_setattr failed: %m\n", __FUNCTION__);
exit (1);
}
/* Check the values. */
if (attr.mq_maxmsg != MAXMSG)
{
printf ("%s: mq_maxmsg wrong: is %jd, expected %d\n",
__FUNCTION__, (intmax_t) attr.mq_maxmsg, MAXMSG);
exit (1);
}
if (attr.mq_msgsize != MAXMSG)
{
printf ("%s: mq_msgsize wrong: is %jd, expected %d\n",
__FUNCTION__, (intmax_t) attr.mq_msgsize, MSGSIZE);
exit (1);
}
/* Read the message. */
char buf[attr.mq_msgsize];
ssize_t n = TEMP_FAILURE_RETRY (mq_receive (m, buf, attr.mq_msgsize, NULL));
if (n != sizeof (message))
{
printf ("%s: length of message wrong: is %zd, expected %zu\n",
__FUNCTION__, n, sizeof (message));
exit (1);
}
if (memcmp (buf, message, sizeof (message)) != 0)
{
printf ("%s: message wrong: is \"%s\", expected \"%s\"\n",
__FUNCTION__, buf, message);
exit (1);
}
exit (UNIQUE);
}
int
do_test (void)
{
char tmpfname[] = "/tmp/tst-mqueue3-barrier.XXXXXX";
int fd = mkstemp (tmpfname);
if (fd == -1)
{
printf ("cannot open temporary file: %m\n");
return 1;
}
/* Make sure it is always removed. */
unlink (tmpfname);
/* Create one page of data. */
size_t ps = sysconf (_SC_PAGESIZE);
char data[ps];
memset (data, '\0', ps);
/* Write the data to the file. */
if (write (fd, data, ps) != (ssize_t) ps)
{
puts ("short write");
return 1;
}
void *mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (mem == MAP_FAILED)
{
printf ("mmap failed: %m\n");
return 1;
}
pthread_barrier_t *b;
b = (pthread_barrier_t *) (((uintptr_t) mem + __alignof (pthread_barrier_t))
& ~(__alignof (pthread_barrier_t) - 1));
pthread_barrierattr_t a;
if (pthread_barrierattr_init (&a) != 0)
{
puts ("barrierattr_init failed");
return 1;
}
if (pthread_barrierattr_setpshared (&a, PTHREAD_PROCESS_SHARED) != 0)
{
puts ("barrierattr_setpshared failed, could not test");
return 0;
}
if (pthread_barrier_init (b, &a, 2) != 0)
{
puts ("barrier_init failed");
return 1;
}
if (pthread_barrierattr_destroy (&a) != 0)
{
puts ("barrierattr_destroy failed");
return 1;
}
/* Name for the message queue. */
char mqname[sizeof ("/tst-mqueue3-") + 3 * sizeof (pid_t)];
snprintf (mqname, sizeof (mqname) - 1, "/tst-mqueue3-%ld",
(long int) getpid ());
/* Create the message queue. */
struct mq_attr attr = { .mq_maxmsg = MAXMSG, .mq_msgsize = MSGSIZE };
m = mq_open (mqname, O_CREAT | O_EXCL | O_RDWR, 0600, &attr);
if (m == -1)
{
if (errno == ENOSYS)
FAIL_UNSUPPORTED ("mq_open not supported");
printf ("mq_open failed with: %m\n");
return 1;
}
/* Unlink the message queue right away. */
if (mq_unlink (mqname) != 0)
{
puts ("mq_unlink failed");
return 1;
}
pid = fork ();
if (pid == -1)
{
puts ("fork failed");
return 1;
}
if (pid == 0)
{
/* Request notification via thread. */
struct sigevent ev;
ev.sigev_notify = SIGEV_THREAD;
ev.sigev_notify_function = fct;
ev.sigev_value.sival_ptr = NULL;
ev.sigev_notify_attributes = NULL;
/* Tell the kernel. */
if (mq_notify (m,&ev) != 0)
{
puts ("mq_notify failed");
exit (1);
}
/* Tell the parent we are ready. */
(void) pthread_barrier_wait (b);
/* Make sure the process goes away eventually. */
alarm (10);
/* Do nothing forever. */
while (1)
pause ();
}
/* Wait for the child process to register to notification method. */
(void) pthread_barrier_wait (b);
/* Send the message. */
if (mq_send (m, message, sizeof (message), 1) != 0)
{
kill (pid, SIGKILL);
puts ("mq_send failed");
return 1;
}
int r;
if (TEMP_FAILURE_RETRY (waitpid (pid, &r, 0)) != pid)
{
kill (pid, SIGKILL);
puts ("waitpid failed");
return 1;
}
return WIFEXITED (r) && WEXITSTATUS (r) == UNIQUE ? 0 : 1;
}
# define TEST_FUNCTION do_test ()
#else
# define TEST_FUNCTION 0
#endif
#include "../test-skeleton.c"
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