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      1 /*	$NetBSD: logwtmp.c,v 1.14 2003/08/07 16:44:59 agc 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. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #if defined(LIBC_SCCS) && !defined(lint)
     34 #if 0
     35 static char sccsid[] = "@(#)logwtmp.c	8.1 (Berkeley) 6/4/93";
     36 #else
     37 __RCSID("$NetBSD: logwtmp.c,v 1.14 2003/08/07 16:44:59 agc Exp $");
     38 #endif
     39 #endif /* LIBC_SCCS and not lint */
     40 
     41 #include <sys/types.h>
     42 #include <sys/file.h>
     43 #include <sys/time.h>
     44 #include <sys/stat.h>
     45 
     46 #include <assert.h>
     47 #include <string.h>
     48 #include <time.h>
     49 #include <unistd.h>
     50 #include <utmp.h>
     51 #include <util.h>
     52 
     53 void
     54 logwtmp(const char *line, const char *name, const char *host)
     55 {
     56 	struct utmp ut;
     57 	struct stat buf;
     58 	int fd;
     59 
     60 	_DIAGASSERT(line != NULL);
     61 	_DIAGASSERT(name != NULL);
     62 	_DIAGASSERT(host != NULL);
     63 
     64 	if ((fd = open(_PATH_WTMP, O_WRONLY|O_APPEND, 0)) < 0)
     65 		return;
     66 	if (fstat(fd, &buf) == 0) {
     67 		(void) strncpy(ut.ut_line, line, sizeof(ut.ut_line));
     68 		(void) strncpy(ut.ut_name, name, sizeof(ut.ut_name));
     69 		(void) strncpy(ut.ut_host, host, sizeof(ut.ut_host));
     70 		(void) time(&ut.ut_time);
     71 		if (write(fd, &ut, sizeof(struct utmp)) != sizeof(struct utmp))
     72 			(void) ftruncate(fd, buf.st_size);
     73 	}
     74 	(void) close(fd);
     75 }
     76