1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) 2021 FUJITSU LIMITED. All rights reserved.
4 * Author: Yang Xu <xuyang2018.jy@fujitsu.com>
5 */
6
7/*\
8 * [Description]
9 *
10 * It is a basic test for shm_next_id.
11 *
12 * shm_next_id specifies desired id for next allocated IPC shared memory. By
13 * default it's equal to -1, which means generic allocation logic.
14 * Possible values to set are in range {0..INT_MAX}.
15 * The value will be set back to -1 by kernel after successful IPC object
16 * allocation.
17 */
18
19#include <errno.h>
20#include <string.h>
21#include <sys/types.h>
22#include <sys/ipc.h>
23#include <sys/shm.h>
24#include "tst_test.h"
25#include "tst_safe_sysv_ipc.h"
26#include "libnewipc.h"
27
28#define NEXT_ID_PATH "/proc/sys/kernel/shm_next_id"
29static int shm_id, pid;
30static key_t shmkey;
31
32static void verify_shmget(void)
33{
34	SAFE_FILE_PRINTF(NEXT_ID_PATH, "%d", pid);
35
36	shm_id = SAFE_SHMGET(shmkey, SHM_SIZE, SHM_RW | IPC_CREAT);
37	if (shm_id == pid)
38		tst_res(TPASS, "shm_next_id succeeded, shm id %d", pid);
39	else
40		tst_res(TFAIL, "shm_next_id failed, expected id %d, but got %d", pid, shm_id);
41
42	TST_ASSERT_INT(NEXT_ID_PATH, -1);
43	SAFE_SHMCTL(shm_id, IPC_RMID, NULL);
44	pid++;
45}
46
47static void setup(void)
48{
49	shmkey = GETIPCKEY();
50	pid = getpid();
51}
52
53static void cleanup(void)
54{
55	if (shm_id != -1)
56		SAFE_SHMCTL(shm_id, IPC_RMID, NULL);
57}
58
59static struct tst_test test = {
60	.needs_tmpdir = 1,
61	.setup = setup,
62	.cleanup = cleanup,
63	.test_all = verify_shmget,
64	.needs_kconfigs = (const char *[]) {
65		"CONFIG_CHECKPOINT_RESTORE=y",
66		NULL
67	},
68	.needs_root = 1,
69};
70