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/* Copyright (C) 1991 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., 675 Mass Ave,

Cambridge, MA 02139, USA.  */

#include <ansidecl.h>

#include <errno.h>

#include <unistd.h>

#include <termios.h>

/* Return 1 if FD is a terminal, 0 if not.  */

int isatty(int fd)

{

  int save;

  int is_tty;

  struct termios term;

  save = errno;

  is_tty = tcgetattr(fd, &term) == 0;

  errno = save;

  return is_tty;

}