1 /* $OpenBSD: logout.c,v 1.4 1998/07/13 02:11:13 millert Exp $ */ 2 /* 3 * Copyright (c) 1988, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the University of 17 * California, Berkeley and its contributors. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #if defined(LIBC_SCCS) && !defined(lint) 36 /* from: static char sccsid[] = "@(#)logout.c 8.1 (Berkeley) 6/4/93"; */ 37 static char *rcsid = "$Id: logout.c,v 1.4 1998/07/13 02:11:13 millert Exp $"; 38 #endif /* LIBC_SCCS and not lint */ 39 40 #include <sys/types.h> 41 #include <sys/time.h> 42 43 #include <fcntl.h> 44 #include <utmp.h> 45 #include <unistd.h> 46 #include <stdlib.h> 47 #include <string.h> 48 49 #include "util.h" 50 51 typedef struct utmp UTMP; 52 53 int 54 logout(line) 55 const char *line; 56 { 57 int fd, rval; 58 UTMP ut; 59 60 if ((fd = open(_PATH_UTMP, O_RDWR, 0)) < 0) 61 return(0); 62 rval = 0; 63 while (read(fd, &ut, sizeof(UTMP)) == sizeof(UTMP)) { 64 if (!ut.ut_name[0] || strncmp(ut.ut_line, line, UT_LINESIZE)) 65 continue; 66 bzero(ut.ut_name, UT_NAMESIZE); 67 bzero(ut.ut_host, UT_HOSTSIZE); 68 (void)time(&ut.ut_time); 69 (void)lseek(fd, -(off_t)sizeof(UTMP), SEEK_CUR); 70 (void)write(fd, &ut, sizeof(UTMP)); 71 rval = 1; 72 } 73 (void)close(fd); 74 return(rval); 75 } 76