/******************************************************************************/
/* Copyright (c) Crackerjack Project., 2007				   */
/*									    */
/* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA    */
/*									    */
/******************************************************************************/
/******************************************************************************/
/*									    */
/* File:	unshare02.c						   */
/*									    */
/* Description: This tests the unshare error() syscall			*/
/*									    */
/* Usage:  <for command-line>						 */
/* unshare02 [-c n] [-e][-i n] [-I x] [-p x] [-t]			     */
/*      where,  -c n : Run n copies concurrently.			     */
/*	      -e   : Turn on errno logging.				 */
/*	      -i n : Execute test n times.				  */
/*	      -I x : Execute test for x seconds.			    */
/*	      -P x : Pause for x seconds between iterations.		*/
/*	      -t   : Turn on syscall timing.				*/
/*									    */
/* Total Tests: 2							     */
/*									    */
/* Test Name:   unshare02						     */
/* History:     Porting from Crackerjack to LTP is done by		    */
/*	      Manas Kumar Nayak maknayak@in.ibm.com>			*/
/******************************************************************************/

#define _GNU_SOURCE

#include <stdio.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <sched.h>
#include <limits.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/syscall.h>
#include <errno.h>
#include <pwd.h>
#include <grp.h>
#include <string.h>
#include <sys/param.h>
#include <stdio.h>

#include "test.h"
#include "safe_macros.h"
#include "config.h"

char *TCID = "unshare02";
int testno;
int TST_TOTAL = 2;

#ifdef HAVE_UNSHARE

/* Extern Global Functions */
/******************************************************************************/
/*									    */
/* Function:    cleanup						       */
/*									    */
/* Description: Performs all one time clean up for this test on successful    */
/*	      completion,  premature exit or  failure. Closes all temporary */
/*	      files, removes all temporary directories exits the test with  */
/*	      appropriate TEST_RETURNurn code by calling tst_exit() function.       */
/*									    */
/* Input:       None.							 */
/*									    */
/* Output:      None.							 */
/*									    */
/* Return:      On failure - Exits calling tst_exit(). Non '0' TEST_RETURNurn code.   */
/*	      On success - Exits calling tst_exit(). With '0' TEST_RETURNurn code.  */
/*									    */
/******************************************************************************/
void cleanup(void)
{

	tst_rmdir();

	/* Exit with appropriate TEST_RETURNurn code. */

}

/* Local  Functions */
/******************************************************************************/
/*									    */
/* Function:    setup							 */
/*									    */
/* Description: Performs all one time setup for this test. This function is   */
/*	      typically used to capture signals, create temporary dirs      */
/*	      and temporary files that may be used in the course of this    */
/*	      test.							 */
/*									    */
/* Input:       None.							 */
/*									    */
/* Output:      None.							 */
/*									    */
/* Return:      On failure - Exits by calling cleanup().		      */
/*	      On success - TEST_RETURNurns 0.				       */
/*									    */
/******************************************************************************/
void setup(void)
{
	/* Capture signals if any */
	/* Create temporary directories */
	TEST_PAUSE;
	tst_tmpdir();
}

int main(int ac, char **av)
{
	pid_t pid1;
	int lc;
	int rval;

	tst_parse_opts(ac, av, NULL, NULL);

	setup();

	for (lc = 0; TEST_LOOPING(lc); ++lc) {
		tst_count = 0;
		for (testno = 0; testno < TST_TOTAL; ++testno) {

			TEST(pid1 = fork());	//call to fork()
			if (TEST_RETURN == -1) {
				tst_brkm(TFAIL | TTERRNO, cleanup,
					 "fork() failed.");
			} else if (TEST_RETURN == 0) {
				TEST_RETURN = unshare(-1);
				if (TEST_RETURN == 0) {
					printf("Call unexpectedly succeeded\n");
					rval = 1;
				} else if (TEST_RETURN == -1) {
					if (errno == EINVAL) {
						printf("Got EINVAL\n");
						rval = 0;
					} else if (errno == ENOSYS) {
						rval = 1;
					} else {
						perror("unshare failed");
						rval = 2;
					}
				}
				exit(rval);
			} else {
				SAFE_WAIT(cleanup, &rval);
				if (rval != 0 && WIFEXITED(rval)) {
					switch (WEXITSTATUS(rval)) {
					case 1:
						tst_brkm(TBROK, cleanup,
							 "unshare call unsupported "
							 "in kernel");
						break;
					case 2:
						tst_brkm(TFAIL, cleanup,
							 "unshare call failed");
						break;
					}
				}
			}

			TEST(pid1 = fork());	//call to fork()
			if (pid1 == -1) {
				tst_brkm(TFAIL | TTERRNO, cleanup,
					 "fork() failed.");
			} else if (TEST_RETURN == 0) {
				TEST_RETURN = unshare(0);
				if (TEST_RETURN == 0) {
					tst_resm(TPASS, "Call succeeded");
					rval = 0;
				} else if (TEST_RETURN == -1) {
					if (errno == ENOSYS)
						rval = 1;
					else {
						perror("unshare failed");
						rval = 2;
					}
				}
				exit(rval);
			} else {
				SAFE_WAIT(cleanup, &rval);
				if (rval != 0 && WIFEXITED(rval)) {
					switch (WEXITSTATUS(rval)) {
					case 1:
						tst_brkm(TBROK, cleanup,
							 "unshare call unsupported "
							 "in kernel");
						break;
					case 2:
						tst_brkm(TFAIL, cleanup,
							 "unshare call failed");
						break;
					}
				}
			}

		}
	}
	cleanup();
	tst_exit();
}
#else
int main(void)
{
	tst_brkm(TCONF, NULL, "unshare is undefined.");
}
#endif