Erik Andersen | 3163821 | 2000-01-15 22:28:50 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Mini tty implementation for busybox |
| 3 | * |
| 4 | * Copyright (C) 2000 Edward Betts <edward@debian.org>. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | #include "internal.h" |
| 23 | #include <stdio.h> |
| 24 | #include <sys/types.h> |
| 25 | |
| 26 | static const char tty_usage[] = "tty\n\n" |
| 27 | "Print the file name of the terminal connected to standard input.\n" |
| 28 | "\t-s\tprint nothing, only return an exit status\n"; |
| 29 | |
| 30 | extern int tty_main(int argc, char **argv) { |
| 31 | char *tty; |
| 32 | |
| 33 | if (argc > 1) { |
| 34 | if (argv[1][0] != '-' || argv[1][1] != 's') usage (tty_usage); |
| 35 | } |
| 36 | else { |
| 37 | tty = ttyname (0); |
| 38 | if (tty) puts (tty); |
| 39 | else puts ("not a tty"); |
| 40 | } |
| 41 | exit (isatty (0) ? TRUE : FALSE); |
| 42 | } |