1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 * 03/2001 - Written by Wayne Boyer
5 */
6
7 /*\
8 * [Description]
9 *
10 * Test for ENOSPC error.
11 *
12 * ENOSPC - All possible shared memory segments have been taken (SHMMNI).
13 */
14 #include <errno.h>
15 #include <sys/types.h>
16 #include <sys/ipc.h>
17 #include <stdlib.h>
18 #include <pwd.h>
19 #include <sys/shm.h>
20 #include "tst_test.h"
21 #include "tst_safe_sysv_ipc.h"
22 #include "libnewipc.h"
23
24 static int *queues;
25 static int maxshms, queue_cnt, used_cnt;
26 static key_t shmkey;
27
verify_shmget(void)28 static void verify_shmget(void)
29 {
30 TST_EXP_FAIL2(shmget(shmkey + maxshms, SHM_SIZE, IPC_CREAT | IPC_EXCL | SHM_RW), ENOSPC,
31 "shmget(%i, %i, %i)", shmkey + maxshms, SHM_SIZE, IPC_CREAT | IPC_EXCL | SHM_RW);
32 }
33
setup(void)34 static void setup(void)
35 {
36 int res, num;
37
38 shmkey = GETIPCKEY();
39 used_cnt = GET_USED_SEGMENTS();
40 tst_res(TINFO, "Current environment %d shared memory segments are already in use",
41 used_cnt);
42 SAFE_FILE_SCANF("/proc/sys/kernel/shmmni", "%i", &maxshms);
43
44 queues = SAFE_MALLOC((maxshms - used_cnt) * sizeof(int));
45 for (num = 0; num < maxshms - used_cnt; num++) {
46 res = shmget(shmkey + num, SHM_SIZE, IPC_CREAT | IPC_EXCL | SHM_RW);
47 if (res == -1)
48 tst_brk(TBROK | TERRNO, "shmget failed unexpectedly");
49
50 queues[queue_cnt++] = res;
51 }
52 tst_res(TINFO, "The maximum number of memory segments (%d) has been reached",
53 maxshms);
54 }
55
cleanup(void)56 static void cleanup(void)
57 {
58 int num;
59
60 if (!queues)
61 return;
62
63 for (num = 0; num < queue_cnt; num++)
64 SAFE_SHMCTL(queues[num], IPC_RMID, NULL);
65
66 free(queues);
67 }
68
69 static struct tst_test test = {
70 .needs_tmpdir = 1,
71 .setup = setup,
72 .cleanup = cleanup,
73 .test_all = verify_shmget,
74 };
75