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
35static int maxmsgs;
36static int *queues;
37static key_t msgkey;
38
39static void verify_msgget(void)
40{
41	TEST(msgget(msgkey + maxmsgs, IPC_CREAT | IPC_EXCL));
42	if (TEST_RETURN != -1)
43		tst_res(TFAIL, "msgget() succeeded unexpectedly");
44
45	if (TEST_ERRNO == 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
53static 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
75static 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
90static struct tst_test test = {
91	.needs_tmpdir = 1,
92	.setup = setup,
93	.cleanup = cleanup,
94	.test_all = verify_msgget
95};
96