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 are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18 #if defined(LIBC_SCCS) && !defined(lint) 19 static char sccsid[] = "@(#)logout.c 5.4 (Berkeley) 09/19/89"; 20 #endif /* LIBC_SCCS and not lint */ 21 22 #include <sys/types.h> 23 #include <sys/file.h> 24 #include <sys/time.h> 25 #include <utmp.h> 26 27 typedef struct utmp UTMP; 28 29 logout(line) 30 register char *line; 31 { 32 register int fd; 33 UTMP ut; 34 int rval; 35 off_t lseek(); 36 time_t time(); 37 38 if ((fd = open(_PATH_UTMP, O_RDWR)) < 0) 39 return(0); 40 rval = 0; 41 while (read(fd, (char *)&ut, sizeof(UTMP)) == sizeof(UTMP)) { 42 if (!ut.ut_name[0] || strncmp(ut.ut_line, line, UT_LINESIZE)) 43 continue; 44 bzero(ut.ut_name, UT_NAMESIZE); 45 bzero(ut.ut_host, UT_HOSTSIZE); 46 (void)time(&ut.ut_time); 47 (void)lseek(fd, -(long)sizeof(UTMP), L_INCR); 48 (void)write(fd, (char *)&ut, sizeof(UTMP)); 49 rval = 1; 50 } 51 (void)close(fd); 52 return(rval); 53 } 54