1 /* 2 * Copyright (c) 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #if defined(LIBC_SCCS) && !defined(lint) 9 static char sccsid[] = "@(#)logout.c 8.1 (Berkeley) 06/04/93"; 10 #endif /* LIBC_SCCS and not lint */ 11 12 #include <sys/types.h> 13 #include <sys/time.h> 14 15 #include <fcntl.h> 16 #include <utmp.h> 17 #include <unistd.h> 18 #include <stdlib.h> 19 #include <string.h> 20 21 typedef struct utmp UTMP; 22 23 int 24 logout(line) 25 register char *line; 26 { 27 register int fd; 28 UTMP ut; 29 int rval; 30 31 if ((fd = open(_PATH_UTMP, O_RDWR, 0)) < 0) 32 return(0); 33 rval = 0; 34 while (read(fd, &ut, sizeof(UTMP)) == sizeof(UTMP)) { 35 if (!ut.ut_name[0] || strncmp(ut.ut_line, line, UT_LINESIZE)) 36 continue; 37 bzero(ut.ut_name, UT_NAMESIZE); 38 bzero(ut.ut_host, UT_HOSTSIZE); 39 (void)time(&ut.ut_time); 40 (void)lseek(fd, -(off_t)sizeof(UTMP), L_INCR); 41 (void)write(fd, &ut, sizeof(UTMP)); 42 rval = 1; 43 } 44 (void)close(fd); 45 return(rval); 46 } 47