/* Copyright (C) 2016-2018 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 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; see the file COPYING.LIB.  If

   not, see <http://www.gnu.org/licenses/>.  */

#include <unistd.h>

#include <stdbool.h>

#include <sys/sysmacros.h>

#include <sys/types.h>

#include <sys/stat.h>

/* Return true if this is a UNIX98 pty device, as defined in

   linux/Documentation/devices.txt (on linux < 4.10) or

   linux/Documentation/admin-guide/devices.txt (on linux >= 4.10).  */

static inline bool

is_pty (struct stat64 *sb)

{

#ifdef _STATBUF_ST_RDEV

  int m = __gnu_dev_major (sb->st_rdev);

  return (136 <= m && m <= 143);

#else

  return false;

#endif

}

static inline bool

is_mytty (const struct stat64 *mytty, const struct stat64 *maybe)

{

  return (maybe->st_ino == mytty->st_ino

	  && maybe->st_dev == mytty->st_dev

#ifdef _STATBUF_ST_RDEV

	  && S_ISCHR (maybe->st_mode)

	  && maybe->st_rdev == mytty->st_rdev

#endif

	  );

}