1 /* $NetBSD: logout.c,v 1.7 1997/08/25 19:31:46 kleink 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)logout.c 8.1 (Berkeley) 6/4/93"; 40 #else 41 __RCSID("$NetBSD: logout.c,v 1.7 1997/08/25 19:31:46 kleink Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include <sys/types.h> 46 #include <sys/time.h> 47 48 #include <fcntl.h> 49 #include <utmp.h> 50 #include <unistd.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <util.h> 54 55 typedef struct utmp UTMP; 56 57 int 58 logout(line) 59 const char *line; 60 { 61 int fd, rval; 62 UTMP ut; 63 64 if ((fd = open(_PATH_UTMP, O_RDWR, 0)) < 0) 65 return(0); 66 rval = 0; 67 while (read(fd, &ut, sizeof(UTMP)) == sizeof(UTMP)) { 68 if (!ut.ut_name[0] || strncmp(ut.ut_line, line, UT_LINESIZE)) 69 continue; 70 bzero(ut.ut_name, UT_NAMESIZE); 71 bzero(ut.ut_host, UT_HOSTSIZE); 72 (void)time(&ut.ut_time); 73 (void)lseek(fd, -(off_t)sizeof(UTMP), SEEK_CUR); 74 (void)write(fd, &ut, sizeof(UTMP)); 75 rval = 1; 76 } 77 (void)close(fd); 78 return(rval); 79 } 80