lib/libutil/login.c

   1 /*-
   2  * Copyright (c) 1988, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)login.c  8.1 (Berkeley) 6/4/93
  30  * $FreeBSD: src/lib/libutil/login.c,v 1.6 1999/08/28 00:05:45 peter Exp $
  31  */
  32
  33 #include <sys/types.h>
  34
  35 #include <fcntl.h>
  36 #include <stdlib.h>
  37 #include <unistd.h>
  38 #include <utmp.h>
  39 #include <libutil.h>
  40
  41 void
  42 login(struct utmp *ut)
  43 {
  44         int fd;
  45         int tty;
  46
  47         tty = ttyslot();
  48         if (tty > 0 && (fd = open(_PATH_UTMP, O_WRONLY|O_CREAT, 0644)) >= 0) {
  49                 (void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), L_SET);
  50                 (void)write(fd, ut, sizeof(struct utmp));
  51                 (void)close(fd);
  52         }
  53         if ((fd = open(_PATH_WTMP, O_WRONLY|O_APPEND, 0)) >= 0) {
  54                 (void)write(fd, ut, sizeof(struct utmp));
  55                 (void)close(fd);
  56         }
  57 }