glibc/login/logout.c

/* Copyright (C) 1996 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.

The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

#include <errno.h>
#include <string.h>
#include <utmp.h>
#include <sys/time.h>

int
logout (const char *line)
{
  struct utmp tmp, utbuf;
  struct utmp *ut;
  int result = 0;

  /* Tell that we want to use the UTMP file.  */
  if (utmpname (_PATH_UTMP) == 0)
    return 0;

  /* Open UTMP file.  */
  setutent ();

  /* Fill in search information.  */
#if _HAVE_UT_TYPE - 0
  tmp.ut_type = USER_PROCESS;
#endif
  strncpy (tmp.ut_line, line, sizeof tmp.ut_line);

  /* Read the record.  */
  if (getutline_r (&tmp, &utbuf, &ut) >= 0)
    {
      /* Clear information about who & from where.  */
      bzero (ut->ut_name, sizeof ut->ut_name);
#if _HAVE_UT_HOST - 0
      bzero (ut->ut_host, sizeof ut->ut_host);
#endif
#if _HAVE_UT_TV - 0
      gettimeofday (&ut->ut_tv, NULL);
#else
      time (&ut->ut_time);
#endif

      if (pututline (ut) >= 0)
	result = 1;
    }

  /* Close UTMP file.  */
  endutent ();

  return result;
}