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 5.3 (Berkeley) 04/18/89"; 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 #include <stdio.h> 27 28 /* 0 on failure, 1 on success */ 29 30 logout(line) 31 register char *line; 32 { 33 register FILE *fp; 34 struct utmp ut; 35 int rval; 36 time_t time(); 37 38 if (!(fp = fopen(_PATH_UTMP, "r+"))) 39 return(0); 40 rval = 0; 41 while (fread((char *)&ut, sizeof(struct utmp), 1, fp) == 1) { 42 if (!ut.ut_name[0] || 43 strncmp(ut.ut_line, line, sizeof(ut.ut_line))) 44 continue; 45 bzero(ut.ut_name, sizeof(ut.ut_name)); 46 bzero(ut.ut_host, sizeof(ut.ut_host)); 47 (void)time(&ut.ut_time); 48 (void)fseek(fp, (long)-sizeof(struct utmp), L_INCR); 49 (void)fwrite((char *)&ut, sizeof(struct utmp), 1, fp); 50 (void)fseek(fp, (long)0, L_INCR); 51 rval = 1; 52 } 53 (void)fclose(fp); 54 return(rval); 55 } 56