libutil/logout.c

   1 /* Copyright (C) 1996, 1997, 2002 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 Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <string.h>
  21 #include <sys/time.h>
  22 #include "internal/utmp.h"
  23
  24 int
  25 logout (const char *line)
  26 {
  27   struct UT tmp;
  28   struct UT *ut;
  29   int result = 0;
  30
  31   /* if (utmpname (_PATH_UTMP) == -1) return 0; - why?
  32    * this makes it impossible for caller to use other file!
  33    * Does any standard or historical precedent says this must be done? */
  34
  35   /* Open UTMP file.  */
  36   setutent ();
  37
  38   /* Fill in search information.  */
  39 #if _HAVE_UT_TYPE - 0
  40   tmp.ut_type = USER_PROCESS;
  41 #endif
  42   strncpy (tmp.ut_line, line, sizeof tmp.ut_line);
  43
  44   /* Read the record.  */
  45   if ((ut = getutline(&tmp)) != NULL)
  46     {
  47       /* Clear information about who & from where.  */
  48       memset (ut->ut_name, 0, sizeof ut->ut_name);
  49 #if _HAVE_UT_HOST - 0
  50       memset (ut->ut_host, 0, sizeof ut->ut_host);
  51 #endif
  52 #if _HAVE_UT_TV - 0
  53 # if !defined __WORDSIZE_TIME64_COMPAT32
  54       gettimeofday (&ut->ut_tv, NULL);
  55 # else
  56       {
  57         struct timeval tv;
  58         gettimeofday (&tv, NULL);
  59         ut->ut_tv.tv_sec = tv.tv_sec;
  60         ut->ut_tv.tv_usec = tv.tv_usec;
  61       }
  62 # endif
  63 #else
  64       time (&ut->ut_time);
  65 #endif
  66 #if _HAVE_UT_TYPE - 0
  67       ut->ut_type = DEAD_PROCESS;
  68 #endif
  69
  70       if (pututline (ut) != NULL)
  71         result = 1;
  72     }
  73
  74   /* Close UTMP file.  */
  75   endutent ();
  76
  77   return result;
  78 }