/*
 *
 *   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;  if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/*
 * Test Name: fstat04
 *
 * Test Description:
 *  Verify that, fstat(2) succeeds to get the status of a file pointed by
 *  file descriptor and fills the stat structure elements.
 *
 * Expected Result:
 *  fstat() should return value 0 on success and the stat structure should
 *  be filled with specified 'file' information.
 *
 * Algorithm:
 *  Setup:
 *   Setup signal handling.
 *   Create temporary directory.
 *   Pause for SIGUSR1 if option specified.
 *
 *  Test:
 *   Loop if the proper options are given.
 *   Execute system call
 *   Check return code, if system call failed (return=-1)
 *	Log the errno and Issue a FAIL message.
 *   Otherwise,
 *	Verify the Functionality of system call
 *      if successful,
 *		Issue Functionality-Pass message.
 *      Otherwise,
 *		Issue Functionality-Fail message.
 *  Cleanup:
 *   Print errno log and/or timing stats if options given
 *   Delete the temporary directory created.
 *
 * Usage:  <for command-line>
 *  fstat04 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
 *     where,  -c n : Run n copies concurrently.
 *             -f   : Turn off functionality Testing.
 *	       -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.
 *
 * HISTORY
 *	07/2001 Ported by Wayne Boyer
 *
 * RESTRICTIONS:
 *
 */
#include <stdio.h>
#include <sys/types.h>
#include <sys/fcntl.h>
#include <sys/stat.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <pwd.h>

#include "test.h"

#define FILE_MODE	0644
#define TESTFILE	"testfile"
#define FILE_SIZE       1024
#define BUF_SIZE	256
#define MASK		0777

char *TCID = "fstat04";
int TST_TOTAL = 1;
uid_t user_id;			/* user id/group id of test process */
gid_t group_id;
int fildes;			/* File descriptor of testfile */

char nobody_uid[] = "nobody";
struct passwd *ltpuser;

void setup();
void cleanup();

int main(int ac, char **av)
{
	struct stat stat_buf;	/* stat structure buffer */
	int lc;
	const char *msg;

	if ((msg = parse_opts(ac, av, NULL, NULL)) != NULL)
		tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);

	setup();

	for (lc = 0; TEST_LOOPING(lc); lc++) {

		tst_count = 0;

		/*
		 * Call fstat(2) to get the status of
		 * specified 'file' pointed to 'fd'
		 * into stat structure.
		 */
		TEST(fstat(fildes, &stat_buf));

		if (TEST_RETURN == -1) {
			tst_resm(TFAIL | TTERRNO, "fstat failed");
			continue;
		}
		/*
		 * Verify the data returned by fstat(2)
		 * aganist the expected data.
		 */
		if (stat_buf.st_uid != user_id ||
		    stat_buf.st_gid != group_id ||
		    stat_buf.st_size != FILE_SIZE ||
		    (stat_buf.st_mode & MASK) != FILE_MODE) {
			tst_resm(TFAIL,
				 "fstat functionality incorrect");
		} else
			tst_resm(TPASS, "fstat functionality correct");
	}

	cleanup();
	tst_exit();
}

/*
 * void
 * setup() -  Performs setup function for the test.
 *  Creat a temporary directory and chdir to it.
 *  Creat a test file and write some data into it.
 *  Get the user/group id info. of test process.
 */
void setup(void)
{
	char tst_buff[BUF_SIZE];	/* data buffer */
	int wbytes;		/* no. of bytes written */
	int write_len = 0;	/* data length */

	tst_require_root(NULL);

	ltpuser = getpwnam(nobody_uid);
	if (ltpuser == NULL)
		tst_brkm(TBROK | TERRNO, NULL, "getpwnam failed");
	if (setuid(ltpuser->pw_uid) == -1)
		tst_brkm(TBROK | TERRNO, NULL, "setuid failed");

	tst_sig(NOFORK, DEF_HANDLER, cleanup);

	TEST_PAUSE;

	tst_tmpdir();

	fildes = open(TESTFILE, O_RDWR | O_CREAT, FILE_MODE);
	if (fildes == -1)
		tst_brkm(TBROK | TERRNO, cleanup, "open failed");

	memset(tst_buff, 'a', BUF_SIZE - 1);

	while (write_len < FILE_SIZE) {
		if ((wbytes = write(fildes, tst_buff, sizeof(tst_buff))) <= 0)
			tst_brkm(TBROK | TERRNO, cleanup, "write failed");
		else
			write_len += wbytes;
	}

	user_id = getuid();
	group_id = getgid();

}

void cleanup(void)
{
	if (close(fildes) == -1)
		tst_resm(TWARN | TERRNO, "close failed");

	tst_rmdir();

}