/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License (the "License").

 * You may not use this file except in compliance with the License.

 *

 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

 * or http://www.opensolaris.org/os/licensing.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

 * If applicable, add the following below this CDDL HEADER, with the

 * fields enclosed by brackets "[]" replaced with your own identifying

 * information: Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 */

/*

 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

/*	Copyright (c) 1988 AT&T	*/

/*	  All Rights Reserved  	*/

#pragma ident	"%Z%%M%	%I%	%E% SMI"

/*

 * Return the number of the slot in the utmp file

 * corresponding to the current user: try for file 0, 1, 2.

 * Returns -1 if slot not found.

 */

#include "lint.h"

#include <string.h>

#include <stdio.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <unistd.h>

#include <utmpx.h>

#include <stdlib.h>

#include <pthread.h>

#ifndef TRUE

#define	TRUE 1

#define	FALSE 0

#endif

int

ttyslot(void)

{

	struct futmpx ubuf;

	char *p;

	int s;

	int ret = -1;

	int console = FALSE;

	char ttynm[128];

	FILE *fp;

	int cancel_state;

	/*

	 * The UNIX98 Posix conformance test suite requires

	 * ttyslot() to not be a cancellation point.

	 */

	(void) pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cancel_state);

	if ((p = ttyname_r(0, ttynm, 128)) != NULL ||

	    (p = ttyname_r(1, ttynm, 128)) != NULL ||

	    (p = ttyname_r(2, ttynm, 128)) != NULL) {

		if (strncmp(p, "/dev/", 5) == 0)

			p += 5;

		if (strcmp(p, "console") == 0)

			console = TRUE;

		s = 0;

		if ((fp = fopen(UTMPX_FILE, "rF")) != NULL) {

			while ((fread(&ubuf, sizeof (ubuf), 1, fp)) == 1) {

				if ((ubuf.ut_type == INIT_PROCESS ||

				    ubuf.ut_type == LOGIN_PROCESS ||

				    ubuf.ut_type == USER_PROCESS) &&

				    strncmp(p, ubuf.ut_line,

				    sizeof (ubuf.ut_line)) == 0) {

					ret = s;

					if (!console ||

					    strncmp(ubuf.ut_host, ":0", 2) == 0)

						break;

				}

				s++;

			}

			(void) fclose(fp);

		}

	}

	(void) pthread_setcancelstate(cancel_state, NULL);

	return (ret);

}