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/* Copyright (C) 1998, 1999 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   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 <limits.h>

#include <stdlib.h>

/* If __ASSUME_DEVPTS__ is defined, grantpt() reduces to a stub since we

   assume that the devfs/devpts filesystem automatically manages the

   permissions. */

#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

/* Prototype for function that changes ownership and access permission

   for slave pseudo terminals that do not live on a `devpts'

   filesystem.  */

int __unix_grantpt (int fd);

/* Prototype for private function that gets the name of the slave

   pseudo terminal in a safe way.  */

static int pts_name (int fd, char **pts, size_t buf_len);

#endif

/* Change the ownership and access permission of the slave pseudo

   terminal associated with the master pseudo terminal specified

   by FD.  */

int

grantpt (int fd)

{

#if !defined __ASSUME_DEVPTS__

  struct statfs fsbuf;

# ifdef PATH_MAX

  char _buf[PATH_MAX];

# else

  char _buf[512];

# endif

  char *buf = _buf;

  if (pts_name (fd, &buf, sizeof (_buf)))

    return -1;

  if (statfs (buf, &fsbuf) < 0)

    return -1;

  /* If the slave pseudo terminal lives on a `devpts' filesystem, the

     ownership and access permission are already set.  */

  if (fsbuf.f_type != DEVPTS_SUPER_MAGIC && fsbuf.f_type != DEVFS_SUPER_MAGIC)

  return __unix_grantpt (fd);

#endif

  return 0;

}

#if !defined __ASSUME_DEVPTS__

# define grantpt __unix_grantpt

# include "unix_grantpt.c"

#endif