login/logout.c

   1 /* Copyright (C) 1996 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
  17 not, 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_data data = { ut_fd: -1 };
  29   struct utmp tmp;
  30   struct utmp *ut;
  31   int result = 0;
  32
  33   /* Tell that we want to use the UTMP file.  */
  34   if (utmpname (_PATH_UTMP) == 0)
  35     return 0;
  36
  37   /* Open UTMP file.  */
  38   setutent_r (&data);
  39
  40   /* Fill in search information.  */
  41 #if _HAVE_UT_TYPE - 0
  42   tmp.ut_type = USER_PROCESS;
  43 #endif
  44   strncpy (tmp.ut_line, line, sizeof tmp.ut_line);
  45
  46   /* Read the record.  */
  47   if (getutline_r (&tmp, &ut, &data) >= 0)
  48     {
  49       /* Clear information about who & from where.  */
  50       bzero (ut->ut_name, sizeof ut->ut_name);
  51 #if _HAVE_UT_HOST - 0
  52       bzero (ut->ut_host, sizeof ut->ut_host);
  53 #endif
  54 #if _HAVE_UT_TV - 0
  55       gettimeofday (&ut->ut_tv, NULL);
  56 #else
  57       time (&ut->ut_time);
  58 #endif
  59
  60       if (pututline_r (ut, &data) >= 0)
  61         result = 1;
  62     }
  63
  64   /* Close UTMP file.  */
  65   endutent_r (&data);
  66
  67   return result;
  68 }