Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame^] | 1 | /* vi: set sw=4 ts=4: */ |
Erik Andersen | 3163821 | 2000-01-15 22:28:50 +0000 | [diff] [blame] | 2 | /* |
| 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 | |
| 27 | static const char tty_usage[] = "tty\n\n" |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame^] | 28 | "Print the file name of the terminal connected to standard input.\n" |
Erik Andersen | 3163821 | 2000-01-15 22:28:50 +0000 | [diff] [blame] | 29 | |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame^] | 30 | "\t-s\tprint nothing, only return an exit status\n"; |
| 31 | |
| 32 | extern int tty_main(int argc, char **argv) |
| 33 | { |
Erik Andersen | 3163821 | 2000-01-15 22:28:50 +0000 | [diff] [blame] | 34 | char *tty; |
| 35 | |
| 36 | if (argc > 1) { |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame^] | 37 | 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 Andersen | 3163821 | 2000-01-15 22:28:50 +0000 | [diff] [blame] | 45 | } |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame^] | 46 | exit(isatty(0) ? TRUE : FALSE); |
Erik Andersen | 3163821 | 2000-01-15 22:28:50 +0000 | [diff] [blame] | 47 | } |