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/* Copyright (C) 1998, 1999 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 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 <fcntl.h>

#include <stdlib.h>

#include <unistd.h>

#include <paths.h>

#if !defined __ASSUME_DEVPTS__

# include <sys/statfs.h>

/* Constant that identifies the `devpts' filesystem.  */

# define DEVPTS_SUPER_MAGIC     0x1cd1

/* Constant that identifies the `devfs' filesystem.  */

# define DEVFS_SUPER_MAGIC      0x1373

#endif

/* Path to the master pseudo terminal cloning device.  */

#define _PATH_DEVPTMX _PATH_DEV "ptmx"

/* Directory containing the UNIX98 pseudo terminals.  */

#define _PATH_DEVPTS _PATH_DEV "pts"

#if !defined __UNIX98PTY_ONLY__

/* Prototype for function that opens BSD-style master pseudo-terminals.  */

int __bsd_getpt (void);

#endif

/* Open a master pseudo terminal and return its file descriptor.  */

int

getpt (void)

{

#if !defined __UNIX98PTY_ONLY__

  static int have_no_dev_ptmx;

#endif

  int fd;

#if !defined __UNIX98PTY_ONLY__

  if (!have_no_dev_ptmx)

#endif

    {

      fd = open (_PATH_DEVPTMX, O_RDWR);

      if (fd != -1)

        {

#if defined __ASSUME_DEVPTS__

          return fd;

#else

          struct statfs fsbuf;

          static int devpts_mounted;

          /* Check that the /dev/pts filesystem is mounted

             or if /dev is a devfs filesystem (this implies /dev/pts).  */

          if (devpts_mounted

              || (statfs (_PATH_DEVPTS, &fsbuf) == 0

                  && fsbuf.f_type == DEVPTS_SUPER_MAGIC)

              || (statfs (_PATH_DEV, &fsbuf) == 0

                  && fsbuf.f_type == DEVFS_SUPER_MAGIC))

            {

              /* Everything is ok.  */

              devpts_mounted = 1;

              return fd;

            }

          /* If /dev/pts is not mounted then the UNIX98 pseudo terminals

             are not usable.  */

          close (fd);

#if !defined __UNIX98PTY_ONLY__

          have_no_dev_ptmx = 1;

#endif

#endif

        }

      else

        {

#if !defined __UNIX98PTY_ONLY__

          if (errno == ENOENT || errno == ENODEV)

            have_no_dev_ptmx = 1;

          else

#endif

            return -1;

        }

    }

#if !defined __UNIX98PTY_ONLY__

  return __bsd_getpt ();

#endif

}

#if !defined __UNIX98PTY_ONLY__

# define PTYNAME1 "pqrstuvwxyzabcde";

# define PTYNAME2 "0123456789abcdef";

# define __getpt __bsd_getpt

# include "bsd_getpt.c"

#endif