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
24 static int *sem_id_arr;
25 static int maxsems, array_cnt, used_cnt;
26 static key_t semkey;
27
verify_semget(void)28 static 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
setup(void)35 static 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
cleanup(void)60 static 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
73 static 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