/* Copyright (C) 1998-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <sys/types.h>

#include <termios.h>

#include <unistd.h>

#include <utmp.h>

#include <pty.h>

int

forkpty (int *amaster, char *name, const struct termios *termp,

	 const struct winsize *winp)

{

  int master, slave, pid;

  if (openpty (&master, &slave, name, termp, winp) == -1)

    return -1;

  switch (pid = fork ())

    {

    case -1:

      close (master);

      close (slave);

      return -1;

    case 0:

      /* Child.  */

      close (master);

      if (login_tty (slave))

	_exit (1);

      return 0;

    default:

      /* Parent.  */

      *amaster = master;

      close (slave);

      return pid;

    }

}