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