[821] | 1 | /* vi: set sw=4 ts=4: */
|
---|
| 2 | /*
|
---|
| 3 | * tty implementation for busybox
|
---|
| 4 | *
|
---|
| 5 | * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.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 | /* BB_AUDIT SUSv3 compliant */
|
---|
| 24 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/tty.html */
|
---|
| 25 |
|
---|
| 26 | #include <stdio.h>
|
---|
| 27 | #include <stdlib.h>
|
---|
| 28 | #include <unistd.h>
|
---|
| 29 | #include "busybox.h"
|
---|
| 30 |
|
---|
| 31 | int tty_main(int argc, char **argv)
|
---|
| 32 | {
|
---|
| 33 | const char *s;
|
---|
| 34 | int silent; /* Note: No longer relevant in SUSv3. */
|
---|
| 35 | int retval;
|
---|
| 36 |
|
---|
| 37 | bb_default_error_retval = 2; /* SUSv3 requires > 1 for error. */
|
---|
| 38 |
|
---|
| 39 | silent = bb_getopt_ulflags(argc, argv, "s");
|
---|
| 40 |
|
---|
| 41 | /* gnu tty outputs a warning that it is ignoring all args. */
|
---|
| 42 | bb_warn_ignoring_args(argc - optind);
|
---|
| 43 |
|
---|
| 44 | retval = 0;
|
---|
| 45 |
|
---|
| 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. */
|
---|
| 49 | s = "not a tty";
|
---|
| 50 | retval = 1;
|
---|
| 51 | }
|
---|
| 52 |
|
---|
| 53 | if (!silent) {
|
---|
| 54 | puts(s);
|
---|
| 55 | }
|
---|
| 56 |
|
---|
| 57 | bb_fflush_stdout_and_exit(retval);
|
---|
| 58 | }
|
---|