1 /* vi: set sw=4 ts=4: */
3 * tty implementation for busybox
5 * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 /* BB_AUDIT SUSv3 compliant */
24 /* http://www.opengroup.org/onlinepubs/007904975/utilities/tty.html */
31 extern int tty_main(int argc, char **argv)
34 int silent; /* Note: No longer relevant in SUSv3. */
37 bb_default_error_retval = 2; /* SUSv3 requires > 1 for error. */
39 silent = bb_getopt_ulflags(argc, argv, "s");
41 /* gnu tty outputs a warning that it is ignoring all args. */
42 bb_warn_ignoring_args(argc - optind);
46 if ((s = ttyname(0)) == NULL) {
47 /* According to SUSv3, ttyname can on fail with EBADF or ENOTTY.
48 * We know the file descriptor is good, so failure means not a tty. */
57 bb_fflush_stdout_and_exit(retval);