/* Copyright (C) 1994, 1995, 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 <hurd/fd.h>#include <hurd/term.h>/* Return 1 if FD is a terminal, 0 if not.  */int__isatty (fd)     int fd;{  error_t err;  mach_port_t id;  err = HURD_DPORT_USE (fd, __term_getctty (port, &id));  if (! err)    __mach_port_deallocate (__mach_task_self (), id);  return !err;}weak_alias (__isatty, isatty)