76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-or-later
|
||
|
|
/*
|
||
|
|
* Copyright (c) 2021 FUJITSU LIMITED. All rights reserved.
|
||
|
|
* Author: Yang Xu <xuyang2018.jy@fujitsu.com>
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*\
|
||
|
|
* [Description]
|
||
|
|
*
|
||
|
|
* It is a basic test for shm_next_id.
|
||
|
|
*
|
||
|
|
* When the shared memory segment identifier that shm_next_id stored is already
|
||
|
|
* in use, call shmget with different key just use another unused value in range
|
||
|
|
* [0,INT_MAX]. Kernel doesn't guarantee the desired id.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <errno.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <sys/types.h>
|
||
|
|
#include <sys/ipc.h>
|
||
|
|
#include <sys/shm.h>
|
||
|
|
#include "tst_test.h"
|
||
|
|
#include "tst_safe_sysv_ipc.h"
|
||
|
|
#include "libnewipc.h"
|
||
|
|
|
||
|
|
#define NEXT_ID_PATH "/proc/sys/kernel/shm_next_id"
|
||
|
|
|
||
|
|
static int shm_id[2], pid;
|
||
|
|
static key_t shmkey[2];
|
||
|
|
|
||
|
|
static void verify_shmget(void)
|
||
|
|
{
|
||
|
|
SAFE_FILE_PRINTF(NEXT_ID_PATH, "%d", shm_id[0]);
|
||
|
|
|
||
|
|
shm_id[1] = SAFE_SHMGET(shmkey[1], SHM_SIZE, IPC_CREAT | SHM_RW);
|
||
|
|
if (shm_id[1] == shm_id[0])
|
||
|
|
tst_res(TFAIL, "shm id %d has existed, shmget() returns the"
|
||
|
|
" same shm id unexpectedly", shm_id[0]);
|
||
|
|
else
|
||
|
|
tst_res(TPASS, "shm id %d has existed, shmget() returns the"
|
||
|
|
" new shm id %d", shm_id[0], shm_id[1]);
|
||
|
|
|
||
|
|
SAFE_SHMCTL(shm_id[1], IPC_RMID, NULL);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void setup(void)
|
||
|
|
{
|
||
|
|
shmkey[0] = GETIPCKEY();
|
||
|
|
shmkey[1] = GETIPCKEY();
|
||
|
|
pid = getpid();
|
||
|
|
SAFE_FILE_PRINTF(NEXT_ID_PATH, "%d", pid);
|
||
|
|
shm_id[0] = SAFE_SHMGET(shmkey[0], SHM_SIZE, IPC_CREAT | SHM_RW);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void cleanup(void)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
|
||
|
|
for (i = 0; i < 2; i++) {
|
||
|
|
if (shm_id[i] != -1)
|
||
|
|
SAFE_SHMCTL(shm_id[i], IPC_RMID, NULL);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct tst_test test = {
|
||
|
|
.needs_tmpdir = 1,
|
||
|
|
.setup = setup,
|
||
|
|
.cleanup = cleanup,
|
||
|
|
.test_all = verify_shmget,
|
||
|
|
.needs_kconfigs = (const char *[]) {
|
||
|
|
"CONFIG_CHECKPOINT_RESTORE=y",
|
||
|
|
NULL
|
||
|
|
},
|
||
|
|
.needs_root = 1,
|
||
|
|
};
|