login/logwtmp.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 <string.h>
  21 #include <unistd.h>
  22 #include <utmp.h>
  23
  24
  25 void
  26 logwtmp (const char *line, const char *name, const char *host)
  27 {
  28   struct utmp_data data;
  29   struct utmp ut;
  30
  31   /* Tell that we want to use the UTMP file.  */
  32   if (utmpname (_PATH_WTMP) == 0)
  33     return;
  34
  35   /* Open UTMP file.  */
  36   setutent_r (&data);
  37
  38   /* Position at end of file.  */
  39   data.loc_utmp = lseek (data.ut_fd, 0, SEEK_END);
  40   if (data.loc_utmp == -1)
  41     return;
  42
  43   /* Set information in new entry.  */
  44   bzero (&ut, sizeof (ut));
  45 #if _HAVE_UT_TYPE - 0
  46   ut.ut_type = USER_PROCESS;
  47 #endif
  48   strncpy (ut.ut_line, line, sizeof ut.ut_line);
  49   strncpy (ut.ut_name, name, sizeof ut.ut_name);
  50 #if _HAVE_UT_HOST - 0
  51   strncpy (ut.ut_host, host, sizeof ut.ut_host);
  52 #endif
  53
  54 #if _HAVE_UT_TV - 0
  55   gettimeofday (&ut.ut_tv, NULL);
  56 #else
  57   time (&ut.ut_time);
  58 #endif
  59
  60   /* Write the entry.  */
  61   pututline_r (&ut, &data);
  62
  63   /* Close UTMP file.  */
  64   endutent_r (&data);
  65 }