/*
 * Copyright (c) International Business Machines  Corp., 2001
 *
 * This program is free software;  you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY;  without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 * the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.
 */

/*
 * DESCRIPTION
 * Tests if EIDRM is returned when message queue was removed while
 * msgsnd() was trying to send a message.
 */

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

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

static key_t msgkey;
static int queue_id = -1;
static struct buf {
	long type;
	char text[MSGSIZE];
} snd_buf = {1, "hello"};

static void verify_msgsnd(void)
{
	TEST(msgsnd(queue_id, &snd_buf, MSGSIZE, 0));
	if (TEST_RETURN != -1) {
		tst_res(TFAIL, "msgsnd() succeeded unexpectedly");
		return;
	}

	if (TEST_ERRNO == EIDRM) {
		tst_res(TPASS | TTERRNO, "msgsnd() failed as expected");
	} else {
		tst_res(TFAIL | TTERRNO,
			"msgsnd() failed unexpectedly, expected EIDRM");
	}
}

static void do_test(void)
{
	pid_t pid;

	queue_id = SAFE_MSGGET(msgkey, IPC_CREAT | IPC_EXCL | MSG_RW);

	while (msgsnd(queue_id, &snd_buf, MSGSIZE, IPC_NOWAIT) != -1)
		snd_buf.type += 1;

	pid = SAFE_FORK();
	if (!pid) {
		verify_msgsnd();
		_exit(0);
	}

	TST_PROCESS_STATE_WAIT(pid, 'S');

	SAFE_MSGCTL(queue_id, IPC_RMID, NULL);

	tst_reap_children();
}

static void setup(void)
{
	msgkey = GETIPCKEY();
}

static void cleanup(void)
{
	if (queue_id != -1)
		SAFE_MSGCTL(queue_id, IPC_RMID, NULL);
}

static struct tst_test test = {
	.needs_tmpdir = 1,
	.needs_root = 1,
	.forks_child = 1,
	.setup = setup,
	.cleanup = cleanup,
	.test_all = do_test
};