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/* Copyright (C) 1991, 1995, 1996 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 <errno.h>
#include <unistd.h>
#include <sys/ioctl.h>
/* Return 1 if FD is a terminal, 0 if not. */
int
__isatty (fd)
int fd;
{
int save;
int is_tty;
struct sgttyb term;
save = errno;
is_tty = __ioctl (fd, TIOCGETP, &term) == 0;
__set_errno (save);
return is_tty;
}
weak_alias (__isatty, isatty)
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