login/updwtmp.c

   1 /* Copyright (C) 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 1997.
   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 <unistd.h>
  21 #include <utmp.h>
  22
  23 #include "utmp-private.h"
  24
  25
  26 void
  27 updwtmp (const char *wtmp_file, const struct utmp *utmp)
  28 {
  29   /* See whether utmpd is running.  */
  30   if ((*__libc_utmp_daemon_functions.updwtmp) (wtmp_file, utmp) < 0)
  31     {
  32       /* Use the normal file, but if the current file is _PATH_UTMP or
  33          _PATH_WTMP and the corresponding extended file (with an extra
  34          'x' added to the pathname) exists, we use the extended file,
  35          because the original file is in a different format.  */
  36       if (strcmp (wtmp_file, _PATH_UTMP) == 0
  37           && __access (_PATH_UTMP "x", F_OK) == 0)
  38         (*__libc_utmp_file_functions.updwtmp) (_PATH_UTMP "x", utmp);
  39       else if (strcmp (wtmp_file, _PATH_WTMP) == 0
  40                && __access (_PATH_WTMP "x", F_OK) == 0)
  41         (*__libc_utmp_file_functions.updwtmp) (_PATH_WTMP "x", utmp);
  42       else
  43         (*__libc_utmp_file_functions.updwtmp) (wtmp_file, utmp);
  44     }
  45 }
  46