1 /*
2 * Copyright (c) International Business Machines Corp., 2001
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
12 * the GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program.
16 */
17
18 /*
19 * DESCRIPTION
20 * test for an ENOSPC error by using up all available
21 * message queues.
22 *
23 */
24
25 #include <errno.h>
26 #include <sys/types.h>
27 #include <sys/ipc.h>
28 #include <sys/msg.h>
29 #include <stdlib.h>
30
31 #include "tst_test.h"
32 #include "tst_safe_sysv_ipc.h"
33 #include "libnewipc.h"
34
35 static int maxmsgs;
36 static int *queues;
37 static key_t msgkey;
38
verify_msgget(void)39 static void verify_msgget(void)
40 {
41 TEST(msgget(msgkey + maxmsgs, IPC_CREAT | IPC_EXCL));
42 if (TST_RET != -1)
43 tst_res(TFAIL, "msgget() succeeded unexpectedly");
44
45 if (TST_ERR == ENOSPC) {
46 tst_res(TPASS | TTERRNO, "msgget() failed as expected");
47 } else {
48 tst_res(TFAIL | TTERRNO, "msgget() failed unexpectedly,"
49 " expected ENOSPC");
50 }
51 }
52
setup(void)53 static void setup(void)
54 {
55 int res, num;
56
57 msgkey = GETIPCKEY();
58
59 SAFE_FILE_SCANF("/proc/sys/kernel/msgmni", "%i", &maxmsgs);
60
61 queues = SAFE_MALLOC(maxmsgs * sizeof(int));
62
63 for (num = 0; num < maxmsgs; num++) {
64 queues[num] = -1;
65
66 res = msgget(msgkey + num, IPC_CREAT | IPC_EXCL);
67 if (res != -1)
68 queues[num] = res;
69 }
70
71 tst_res(TINFO, "The maximum number of message queues (%d) reached",
72 maxmsgs);
73 }
74
cleanup(void)75 static void cleanup(void)
76 {
77 int num;
78
79 if (!queues)
80 return;
81
82 for (num = 0; num < maxmsgs; num++) {
83 if (queues[num] != -1)
84 SAFE_MSGCTL(queues[num], IPC_RMID, NULL);
85 }
86
87 free(queues);
88 }
89
90 static struct tst_test test = {
91 .needs_tmpdir = 1,
92 .setup = setup,
93 .cleanup = cleanup,
94 .test_all = verify_msgget
95 };
96