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logwtmp.c revision 1.10 
      1 /*	$NetBSD: logwtmp.c,v 1.10 1999/09/20 04:48:07 lukem 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[] = "@(#)logwtmp.c	8.1 (Berkeley) 6/4/93";
     40 #else
     41 __RCSID("$NetBSD: logwtmp.c,v 1.10 1999/09/20 04:48:07 lukem Exp $");
     42 #endif
     43 #endif /* LIBC_SCCS and not lint */
     44 
     45 #include <sys/types.h>
     46 #include <sys/file.h>
     47 #include <sys/time.h>
     48 #include <sys/stat.h>
     49 
     50 #include <assert.h>
     51 #include <string.h>
     52 #include <time.h>
     53 #include <unistd.h>
     54 #include <utmp.h>
     55 #include <util.h>
     56 
     57 void
     58 logwtmp(line, name, host)
     59 	const char *line, *name, *host;
     60 {
     61 	struct utmp ut;
     62 	struct stat buf;
     63 	int fd;
     64 
     65 	_DIAGASSERT(line != NULL);
     66 	_DIAGASSERT(name != NULL);
     67 	_DIAGASSERT(host != NULL);
     68 
     69 	if ((fd = open(_PATH_WTMP, O_WRONLY|O_APPEND, 0)) < 0)
     70 		return;
     71 	if (fstat(fd, &buf) == 0) {
     72 		(void) strncpy(ut.ut_line, line, sizeof(ut.ut_line));
     73 		(void) strncpy(ut.ut_name, name, sizeof(ut.ut_name));
     74 		(void) strncpy(ut.ut_host, host, sizeof(ut.ut_host));
     75 		(void) time(&ut.ut_time);
     76 		if (write(fd, &ut, sizeof(struct utmp)) != sizeof(struct utmp))
     77 			(void) ftruncate(fd, buf.st_size);
     78 	}
     79 	(void) close(fd);
     80 }
     81