login/logout.c

   1 /* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <errno.h>
  21 #include <string.h>
  22 #include <utmp.h>
  23 #include <sys/time.h>
  24
  25 int
  26 logout (const char *line)
  27 {
  28   struct utmp tmp, utbuf;
  29   struct utmp *ut;
  30   int result = 0;
  31
  32   /* Tell that we want to use the UTMP file.  */
  33   if (utmpname (_PATH_UTMP) == 0)
  34     return 0;
  35
  36   /* Open UTMP file.  */
  37   setutent ();
  38
  39   /* Fill in search information.  */
  40 #if _HAVE_UT_TYPE - 0
  41   tmp.ut_type = USER_PROCESS;
  42 #endif
  43   strncpy (tmp.ut_line, line, sizeof tmp.ut_line);
  44
  45   /* Read the record.  */
  46   if (getutline_r (&tmp, &utbuf, &ut) >= 0)
  47     {
  48       /* Clear information about who & from where.  */
  49       bzero (ut->ut_name, sizeof ut->ut_name);
  50 #if _HAVE_UT_HOST - 0
  51       bzero (ut->ut_host, sizeof ut->ut_host);
  52 #endif
  53 #if _HAVE_UT_TV - 0
  54       gettimeofday (&ut->ut_tv, NULL);
  55 #else
  56       time (&ut->ut_time);
  57 #endif
  58
  59       if (pututline (ut) >= 0)
  60         result = 1;
  61     }
  62
  63   /* Close UTMP file.  */
  64   endutent ();
  65
  66   return result;
  67 }