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/* Basic tests for SYSV semaphore functions.
Copyright (C) 2016-2020 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 <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <support/support.h>
#include <support/check.h>
#include <support/temp_file.h>
/* These are for the temporary file we generate. */
static char *name;
static int semid;
static void
remove_sem (void)
{
/* Enforce message queue removal in case of early test failure.
Ignore error since the sem may already have being removed. */
semctl (semid, 0, IPC_RMID, 0);
}
static void
do_prepare (int argc, char *argv[])
{
int fd = create_temp_file ("tst-sysvsem.", &name);
if (fd == -1)
FAIL_EXIT1 ("cannot create temporary file (errno=%d)", errno);
}
#define PREPARE do_prepare
/* It is not an extensive test, but rather a functional one aimed to check
correct parameter passing on kernel. */
#define SEM_MODE 0644
union semun
{
int val;
struct semid_ds *buf;
unsigned short *array;
};
static int
do_test (void)
{
atexit (remove_sem);
key_t key = ftok (name, 'G');
if (key == -1)
FAIL_EXIT1 ("ftok failed");
semid = semget(key, 1, IPC_CREAT | IPC_EXCL | SEM_MODE);
if (semid == -1)
{
if (errno == ENOSYS)
FAIL_UNSUPPORTED ("msgget not supported");
FAIL_EXIT1 ("semget failed (errno=%d)", errno);
}
/* Get semaphore kernel information and do some sanity checks. */
struct semid_ds seminfo;
if (semctl (semid, 0, IPC_STAT, (union semun) { .buf = &seminfo }) == -1)
FAIL_EXIT1 ("semctl with IPC_STAT failed (errno=%d)", errno);
if (seminfo.sem_perm.__key != key)
FAIL_EXIT1 ("semid_ds::sem_perm::key (%d) != %d",
(int) seminfo.sem_perm.__key, (int) key);
if (seminfo.sem_perm.mode != SEM_MODE)
FAIL_EXIT1 ("semid_ds::sem_perm::mode (%o) != %o",
seminfo.sem_perm.mode, SEM_MODE);
if (seminfo.sem_nsems != 1)
FAIL_EXIT1 ("semid_ds::sem_nsems (%lu) != 1",
(long unsigned) seminfo.sem_nsems);
/* Some lock/unlock basic tests. */
struct sembuf sb1 = { 0, 1, 0 };
if (semop (semid, &sb1, 1) == -1)
FAIL_EXIT1 ("semop failed (errno=%i)", errno);
struct sembuf sb2 = { 0, -1, 0 };
if (semop (semid, &sb2, 1) == -1)
FAIL_EXIT1 ("semop failed (errno=%i)", errno);
#ifdef _GNU_SOURCE
/* Set a time for half a second. The semaphore operation should timeout
with EAGAIN. */
struct timespec ts = { 0 /* sec */, 500000000 /* nsec */ };
if (semtimedop (semid, &sb2, 1, &ts) != -1
|| (errno != EAGAIN && errno != ENOSYS))
FAIL_EXIT1 ("semtimedop succeed or returned errno != {EAGAIN,ENOSYS} "
"(errno=%i)", errno);
#endif
/* Finally free up the semnaphore resource. */
if (semctl (semid, 0, IPC_RMID, 0) == -1)
FAIL_EXIT1 ("semctl failed (errno=%d)", errno);
return 0;
}
#include <support/test-driver.c>
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