1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) International Business Machines Corp., 2001
4 */
5
6/*\
7 * [Description]
8 *
9 * Test for ENOSPC error.
10 *
11 * ENOSPC - a semaphore set exceed the maximum number of semaphore sets(SEMMNI)
12 */
13
14#include <stdio.h>
15#include <stdlib.h>
16#include <unistd.h>
17#include <sys/types.h>
18#include <sys/ipc.h>
19#include "lapi/sem.h"
20#include "tst_test.h"
21#include "libnewipc.h"
22#include "tst_safe_sysv_ipc.h"
23
24static int *sem_id_arr;
25static int maxsems, array_cnt, used_cnt;
26static key_t semkey;
27
28static void verify_semget(void)
29{
30	TST_EXP_FAIL2(semget(semkey + maxsems, PSEMS, IPC_CREAT | IPC_EXCL | SEM_RA),
31		ENOSPC, "semget(%i, %i, %i)", semkey + maxsems, PSEMS,
32		IPC_CREAT | IPC_EXCL | SEM_RA);
33}
34
35static void setup(void)
36{
37	int res, num;
38
39	semkey = GETIPCKEY();
40	used_cnt = GET_USED_ARRAYS();
41	tst_res(TINFO, "Current environment %d semaphore arrays are already in use",
42		used_cnt);
43	SAFE_FILE_SCANF("/proc/sys/kernel/sem", "%*d %*d %*d %d", &maxsems);
44
45	/* Prevent timeout due to high semaphore array limit */
46	tst_set_max_runtime(maxsems / 200);
47
48	sem_id_arr = SAFE_MALLOC((maxsems - used_cnt) * sizeof(int));
49	for (num = 0; num < maxsems - used_cnt; num++) {
50		res = semget(semkey + num, PSEMS, IPC_CREAT | IPC_EXCL | SEM_RA);
51		if (res == -1)
52			tst_brk(TBROK | TERRNO, "semget failed unexpectedly");
53
54		sem_id_arr[array_cnt++] = res;
55	}
56	tst_res(TINFO, "The maximum number of semaphore arrays (%d) has been reached",
57		maxsems);
58}
59
60static void cleanup(void)
61{
62	int num;
63
64	if (!sem_id_arr)
65		return;
66
67	for (num = 0; num < array_cnt; num++)
68		SAFE_SEMCTL(sem_id_arr[num], PSEMS, IPC_RMID);
69
70	free(sem_id_arr);
71}
72
73static struct tst_test test = {
74	.needs_tmpdir = 1,
75	.setup = setup,
76	.cleanup = cleanup,
77	.test_all = verify_semget,
78	.save_restore = (const struct tst_path_val[]){
79		{"/proc/sys/kernel/sem", NULL,
80			TST_SR_TCONF_MISSING | TST_SR_SKIP_RO},
81		{}
82	}
83};
84