| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini tty implementation for busybox |
| * |
| * Copyright (C) 2000 Edward Betts <edward@debian.org>. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| */ |
| |
| #include "internal.h" |
| #include <stdio.h> |
| #include <sys/types.h> |
| |
| static const char tty_usage[] = "tty\n" |
| #ifndef BB_FEATURE_TRIVIAL_HELP |
| "\nPrint the file name of the terminal connected to standard input.\n\n" |
| "Options:\n" |
| "\t-s\tprint nothing, only return an exit status\n" |
| #endif |
| ; |
| |
| extern int tty_main(int argc, char **argv) |
| { |
| char *tty; |
| |
| if (argc > 1) { |
| if (argv[1][0] != '-' || argv[1][1] != 's') |
| usage(tty_usage); |
| } else { |
| tty = ttyname(0); |
| if (tty) |
| puts(tty); |
| else |
| puts("not a tty"); |
| } |
| exit(isatty(0) ? TRUE : FALSE); |
| } |