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/* Basic tests for SYSV shared memory 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 <unistd.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.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 shmid;
static void
remove_shm (void)
{
/* Enforce message queue removal in case of early test failure.
Ignore error since the shm may already have being removed. */
shmctl (shmid, IPC_RMID, 0);
}
static void
do_prepare (int argc, char *argv[])
{
int fd = create_temp_file ("tst-sysvshm.", &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 CHECK_EQ(v, k) \
if ((v) != (k)) \
FAIL_EXIT1("%d != %d", v, k)
#define SHM_MODE 0666
static int
do_test (void)
{
atexit (remove_shm);
key_t key = ftok (name, 'G');
if (key == -1)
FAIL_EXIT1 ("ftok failed");
long int pgsz = sysconf (_SC_PAGESIZE);
if (pgsz == -1)
FAIL_EXIT1 ("sysconf (_SC_PAGESIZE) failed (errno = %d)", errno);
shmid = shmget(key, pgsz, IPC_CREAT | IPC_EXCL | SHM_MODE);
if (shmid == -1)
{
if (errno == ENOSYS)
FAIL_UNSUPPORTED ("shmget not supported");
FAIL_EXIT1 ("shmget failed (errno=%d)", errno);
}
/* Get shared memory kernel information and do some sanity checks. */
struct shmid_ds shminfo;
if (shmctl (shmid, IPC_STAT, &shminfo) == -1)
FAIL_EXIT1 ("shmctl with IPC_STAT failed (errno=%d)", errno);
if (shminfo.shm_perm.__key != key)
FAIL_EXIT1 ("shmid_ds::shm_perm::key (%d) != %d",
(int) shminfo.shm_perm.__key, (int) key);
if (shminfo.shm_perm.mode != SHM_MODE)
FAIL_EXIT1 ("shmid_ds::shm_perm::mode (%o) != %o",
shminfo.shm_perm.mode, SHM_MODE);
if (shminfo.shm_segsz != pgsz)
FAIL_EXIT1 ("shmid_ds::shm_segsz (%lu) != %lu",
(long unsigned) shminfo.shm_segsz, pgsz);
/* Attach on shared memory and realize some operations. */
int *shmem = shmat (shmid, NULL, 0);
if (shmem == (void*) -1)
FAIL_EXIT1 ("shmem failed (errno=%d)", errno);
shmem[0] = 0x55555555;
shmem[32] = 0x44444444;
shmem[64] = 0x33333333;
shmem[128] = 0x22222222;
if (shmdt (shmem) == -1)
FAIL_EXIT1 ("shmem failed (errno=%d)", errno);
shmem = shmat (shmid, NULL, SHM_RDONLY);
if (shmem == (void*) -1)
FAIL_EXIT1 ("shmem failed (errno=%d)", errno);
CHECK_EQ (shmem[0], 0x55555555);
CHECK_EQ (shmem[32], 0x44444444);
CHECK_EQ (shmem[64], 0x33333333);
CHECK_EQ (shmem[128], 0x22222222);
if (shmdt (shmem) == -1)
FAIL_EXIT1 ("shmem failed (errno=%d)", errno);
/* Finally free up the semnaphore resource. */
if (shmctl (shmid, IPC_RMID, 0) == -1)
FAIL_EXIT1 ("semctl failed (errno=%d)", errno);
return 0;
}
#include <support/test-driver.c>
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