blob: 8ac1c1fcd1d28501c08612aeb5dbf86bae3451e3 [file] [log] [blame]
Erik Andersene49d5ec2000-02-08 19:58:47 +00001/* vi: set sw=4 ts=4: */
Erik Andersen31638212000-01-15 22:28:50 +00002/*
3 * Mini tty implementation for busybox
4 *
5 * Copyright (C) 2000 Edward Betts <edward@debian.org>.
6 *
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.
11 *
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.
16 *
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
20 *
21 */
22
23#include "internal.h"
24#include <stdio.h>
25#include <sys/types.h>
26
27static const char tty_usage[] = "tty\n\n"
Erik Andersene49d5ec2000-02-08 19:58:47 +000028 "Print the file name of the terminal connected to standard input.\n"
Erik Andersen31638212000-01-15 22:28:50 +000029
Erik Andersene49d5ec2000-02-08 19:58:47 +000030 "\t-s\tprint nothing, only return an exit status\n";
31
32extern int tty_main(int argc, char **argv)
33{
Erik Andersen31638212000-01-15 22:28:50 +000034 char *tty;
35
36 if (argc > 1) {
Erik Andersene49d5ec2000-02-08 19:58:47 +000037 if (argv[1][0] != '-' || argv[1][1] != 's')
38 usage(tty_usage);
39 } else {
40 tty = ttyname(0);
41 if (tty)
42 puts(tty);
43 else
44 puts("not a tty");
Erik Andersen31638212000-01-15 22:28:50 +000045 }
Erik Andersene49d5ec2000-02-08 19:58:47 +000046 exit(isatty(0) ? TRUE : FALSE);
Erik Andersen31638212000-01-15 22:28:50 +000047}