Home | History | Annotate | Line # | Download | only in libutil
logout.c revision 1.1 
      1 /*
      2  * Copyright (c) 1988 The Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #if defined(LIBC_SCCS) && !defined(lint)
     35 static char sccsid[] = "@(#)logout.c	5.5 (Berkeley) 6/1/90";
     36 #endif /* LIBC_SCCS and not lint */
     37 
     38 #include <sys/types.h>
     39 #include <sys/file.h>
     40 #include <sys/time.h>
     41 #include <utmp.h>
     42 
     43 typedef struct utmp UTMP;
     44 
     45 logout(line)
     46 	register char *line;
     47 {
     48 	register int fd;
     49 	UTMP ut;
     50 	int rval;
     51 	off_t lseek();
     52 	time_t time();
     53 
     54 	if ((fd = open(_PATH_UTMP, O_RDWR)) < 0)
     55 		return(0);
     56 	rval = 0;
     57 	while (read(fd, (char *)&ut, sizeof(UTMP)) == sizeof(UTMP)) {
     58 		if (!ut.ut_name[0] || strncmp(ut.ut_line, line, UT_LINESIZE))
     59 			continue;
     60 		bzero(ut.ut_name, UT_NAMESIZE);
     61 		bzero(ut.ut_host, UT_HOSTSIZE);
     62 		(void)time(&ut.ut_time);
     63 		(void)lseek(fd, -(long)sizeof(UTMP), L_INCR);
     64 		(void)write(fd, (char *)&ut, sizeof(UTMP));
     65 		rval = 1;
     66 	}
     67 	(void)close(fd);
     68 	return(rval);
     69 }
     70