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      1 /*	$NetBSD: logout.c,v 1.16 2005/08/27 17:07:17 elad Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #if defined(LIBC_SCCS) && !defined(lint)
     34 #if 0
     35 static char sccsid[] = "@(#)logout.c	8.1 (Berkeley) 6/4/93";
     36 #else
     37 __RCSID("$NetBSD: logout.c,v 1.16 2005/08/27 17:07:17 elad Exp $");
     38 #endif
     39 #endif /* LIBC_SCCS and not lint */
     40 
     41 #include <sys/types.h>
     42 #include <sys/time.h>
     43 
     44 #include <assert.h>
     45 #include <fcntl.h>
     46 #include <stdlib.h>
     47 #include <string.h>
     48 #include <time.h>
     49 #include <unistd.h>
     50 #include <util.h>
     51 #include <utmp.h>
     52 
     53 int
     54 logout(const char *line)
     55 {
     56 	int fd, rval;
     57 	struct utmp ut;
     58 
     59 	_DIAGASSERT(line != NULL);
     60 
     61 	if ((fd = open(_PATH_UTMP, O_RDWR, 0)) < 0)
     62 		return(0);
     63 	rval = 0;
     64 	while (read(fd, &ut, sizeof(ut)) == sizeof(ut)) {
     65 		if (!ut.ut_name[0] || strncmp(ut.ut_line, line,
     66 					      (size_t)UT_LINESIZE))
     67 			continue;
     68 		memset(ut.ut_name, 0, (size_t)UT_NAMESIZE);
     69 		memset(ut.ut_host, 0, (size_t)UT_HOSTSIZE);
     70 		(void)time(&ut.ut_time);
     71 		(void)lseek(fd, -(off_t)sizeof(ut), SEEK_CUR);
     72 		(void)write(fd, &ut, sizeof(ut));
     73 		rval = 1;
     74 	}
     75 	(void)close(fd);
     76 	return(rval);
     77 }
     78