login/logwtmp.c

   1 /* Copyright (C) 1996-2017 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 <string.h>
  20 #include <sys/time.h>
  21 #include <time.h>
  22 #include <unistd.h>
  23 #include <utmp.h>
  24
  25
  26 void
  27 logwtmp (const char *line, const char *name, const char *host)
  28 {
  29   struct utmp ut;
  30
  31   /* Set information in new entry.  */
  32   memset (&ut, 0, sizeof (ut));
  33 #if _HAVE_UT_PID - 0
  34   ut.ut_pid = getpid ();
  35 #endif
  36 #if _HAVE_UT_TYPE - 0
  37   ut.ut_type = name[0] ? USER_PROCESS : DEAD_PROCESS;
  38 #endif
  39   strncpy (ut.ut_line, line, sizeof ut.ut_line);
  40   strncpy (ut.ut_name, name, sizeof ut.ut_name);
  41 #if _HAVE_UT_HOST - 0
  42   strncpy (ut.ut_host, host, sizeof ut.ut_host);
  43 #endif
  44
  45 #if _HAVE_UT_TV - 0
  46   struct timeval tv;
  47   __gettimeofday (&tv, NULL);
  48   ut.ut_tv.tv_sec = tv.tv_sec;
  49   ut.ut_tv.tv_usec = tv.tv_usec;
  50 #else
  51   ut.ut_time = time (NULL);
  52 #endif
  53
  54   updwtmp (_PATH_WTMP, &ut);
  55 }