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/* Copyright (C) 1991, 1995, 1996, 1997 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; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 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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