source: branches/2.2.2/mindi-busybox/coreutils/tty.c @ 1247

Last change on this file since 1247 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 1.6 KB
Line 
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
31int 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}
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