testcases/kernel/syscalls/ipc/msgget/msgget03.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (c) International Business Machines Corp., 2001
 */

/*
 * DESCRIPTION
 * test for an ENOSPC error by using up all available
 * message queues.
 *
 */

#include <errno.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <stdlib.h>

#include "tst_test.h"
#include "tst_safe_sysv_ipc.h"
#include "libnewipc.h"

static int maxmsgs;
static int *queues;
static key_t msgkey;

static void verify_msgget(void)
{
	TEST(msgget(msgkey + maxmsgs, IPC_CREAT | IPC_EXCL));
	if (TST_RET != -1)
		tst_res(TFAIL, "msgget() succeeded unexpectedly");

	if (TST_ERR == ENOSPC) {
		tst_res(TPASS | TTERRNO, "msgget() failed as expected");
	} else {
		tst_res(TFAIL | TTERRNO, "msgget() failed unexpectedly,"
			" expected ENOSPC");
	}
}

static void setup(void)
{
	int res, num;

	msgkey = GETIPCKEY();

	SAFE_FILE_SCANF("/proc/sys/kernel/msgmni", "%i", &maxmsgs);

	queues = SAFE_MALLOC(maxmsgs * sizeof(int));

	for (num = 0; num < maxmsgs; num++) {
		queues[num] = -1;

		res = msgget(msgkey + num, IPC_CREAT | IPC_EXCL);
		if (res != -1)
			queues[num] = res;
	}

	tst_res(TINFO, "The maximum number of message queues (%d) reached",
		maxmsgs);
}

static void cleanup(void)
{
	int num;

	if (!queues)
		return;

	for (num = 0; num < maxmsgs; num++) {
		if (queues[num] != -1)
			SAFE_MSGCTL(queues[num], IPC_RMID, NULL);
	}

	free(queues);
}

static struct tst_test test = {
	.needs_tmpdir = 1,
	.setup = setup,
	.cleanup = cleanup,
	.test_all = verify_msgget
};