[Ltp-cvs] ltp/testcases/kernel/containers/mqns mqns_04.c,NONE,1.1

[Subrata <sub...@us...>]

Update of /cvsroot/ltp/ltp/testcases/kernel/containers/mqns
In directory ddv4jf1.ch3.sourceforge.com:/tmp/cvs-serv644/ltp/testcases/kernel/containers/mqns

Added Files:
	mqns_04.c 
Log Message:
[PATCH 4/4] ltp: posix mqns: test that user mount of posixmq survives the ipcns: If the mqueuefs for a ipc namespace is mounted in a mounts namespace which outlives the ipcns, then the view of the fs remains valid until someone umounts it.  Run some tests to make sure that all is sane. Signed-off-by: Serge Hallyn <se...@us...>.


--- NEW FILE: mqns_04.c ---
/*
* Copyright (c) International Business Machines Corp., 2009
* 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; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author: Serge Hallyn <se...@us...>
*
* Check mqueuefs lifetime
* . parent creates /dev/mqueue2
* . child mounts mqueue there
* . child does mq_open("/ab")
* . parent checks for /dev/mqueue2
* . child exits
* . parent checks for /dev/mqueue2
* . parent tries 'touch /dev/mqueue2/dd' -> should fail
* . parent umounts /dev/mqueue2

***************************************************************************/

#define _GNU_SOURCE 1
#include <sys/wait.h>
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "mqns.h"

char *TCID = "posixmq_namespace_04";
int TST_TOTAL=1;

int p1[2];
int p2[2];

#define FNAM1 DEV_MQUEUE2 SLASH_MQ1
#define FNAM2 DEV_MQUEUE2 SLASH_MQ2

int check_mqueue(void *vtest)
{
	char buf[30];
	mqd_t mqd;
	int rc;

	close(p1[1]);
	close(p2[0]);

	read(p1[0], buf, 3); /* go */

	mqd = mq_open(SLASH_MQ1, O_RDWR|O_CREAT|O_EXCL, 0755, NULL);
	if (mqd == -1) {
		write(p2[1], "mqfail", 7);
		tst_exit(3);
	}

	mq_close(mqd);

	rc = mount("mqueue", DEV_MQUEUE2, "mqueue", 0, NULL);
	if (rc == -1) {
		perror("mount");
		write(p2[1], "mount", 6);
		tst_exit(3);
	}

	write(p2[1], "go", 3);
	read(p1[0], buf, 3);

	tst_exit(0);

	/* NOT REACHED */
	return 0;
}


int main(int argc, char *argv[])
{
	int r = TFAIL;
	int rc;
	int status;
	char buf[30];
	struct stat statbuf;
	int use_clone = T_UNSHARE;

	if (argc == 2 && strcmp(argv[1], "-clone") == 0) {
		tst_resm(TINFO, "Testing posix mq namespaces through clone(2).\n");
		use_clone = T_CLONE;
	} else
		tst_resm(TINFO, "Testing posix mq namespaces through unshare(2).\n");

	if (pipe(p1) == -1) { perror("pipe"); exit(EXIT_FAILURE); }
	if (pipe(p2) == -1) { perror("pipe"); exit(EXIT_FAILURE); }

	mkdir(DEV_MQUEUE2, 0755);

	tst_resm(TINFO, "Checking mqueue filesystem lifetime\n");

	/* fire off the test */
	rc = do_clone_unshare_test(use_clone, CLONE_NEWIPC, check_mqueue, NULL);
	if (rc < 0) {
		tst_resm(TFAIL, "failed clone/unshare\n");
		goto fail;
	}

	close(p1[0]);
	close(p2[1]);
	write(p1[1], "go", 3);

	read(p2[0], buf, 7);
	if (!strcmp(buf, "mqfail")) {
		tst_resm(TFAIL, "child process could not create mqueue\n");
		goto fail;
	} else if (!strcmp(buf, "mount")) {
		tst_resm(TFAIL, "child process could not mount mqueue\n");
		goto fail;
	}

	rc = stat(FNAM1, &statbuf);
	if (rc == -1) {
		perror("stat");
		write(p1[1], "go", 3);
		tst_resm(TFAIL, "parent could not see child's created mq\n");
		goto fail;
	}
	write(p1[1], "go", 3);

	rc = wait(&status);
	if (rc == -1) {
		perror("wait");
		tst_resm(TFAIL, "error while parent waited on child to exit\n");
		goto fail;
	}
	if (!WIFEXITED(status)) {
		tst_resm(TFAIL, "Child did not exit normally (status %d)\n", status);
		goto fail;
	}
	rc = stat(FNAM1, &statbuf);
	if (rc == -1) {
		tst_resm(TFAIL, "parent's view of child's mq died with child\n");
		goto fail;
	}

	rc = creat(FNAM2, 0755);
	if (rc != -1) {
		tst_resm(TFAIL, "parent was able to create a file in dead child's mqfs\n");
		goto fail;
	}

	tst_resm(TPASS, "Child mqueue fs still visible for parent\n");

	r = 0;

fail:
	umount(DEV_MQUEUE2);
	rmdir(DEV_MQUEUE2);
	tst_exit(r);

	/* NOT REACHED */
	return 0;
}