1 /* Copyright (C) 1994-2022 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, see 16 <https://www.gnu.org/licenses/>. */ 17 18 #include <errno.h> 19 #include <unistd.h> 20 #include <hurd/fd.h> 21 #include <hurd/term.h> 22 23 /* Return 1 if FD is a terminal, 0 if not. */ 24 int __isatty(int fd)25__isatty (int fd) 26 { 27 error_t err; 28 mach_port_t id; 29 30 err = HURD_DPORT_USE (fd, __term_getctty (port, &id)); 31 if (! err) 32 __mach_port_deallocate (__mach_task_self (), id); 33 34 return !err; 35 } 36 37 weak_alias (__isatty, isatty) 38