Contents of /trunk/mkinitrd-magellan/busybox/coreutils/tty.c
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Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
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Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
File MIME type: text/plain
File size: 1012 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
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 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
8 | */ |
9 | |
10 | /* BB_AUDIT SUSv3 compliant */ |
11 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/tty.html */ |
12 | |
13 | #include <stdio.h> |
14 | #include <stdlib.h> |
15 | #include <unistd.h> |
16 | #include "busybox.h" |
17 | |
18 | int tty_main(int argc, char **argv) |
19 | { |
20 | const char *s; |
21 | int silent; /* Note: No longer relevant in SUSv3. */ |
22 | int retval; |
23 | |
24 | xfunc_error_retval = 2; /* SUSv3 requires > 1 for error. */ |
25 | |
26 | silent = getopt32(argc, argv, "s"); |
27 | |
28 | /* gnu tty outputs a warning that it is ignoring all args. */ |
29 | bb_warn_ignoring_args(argc - optind); |
30 | |
31 | retval = 0; |
32 | |
33 | if ((s = ttyname(0)) == NULL) { |
34 | /* According to SUSv3, ttyname can on fail with EBADF or ENOTTY. |
35 | * We know the file descriptor is good, so failure means not a tty. */ |
36 | s = "not a tty"; |
37 | retval = 1; |
38 | } |
39 | |
40 | if (!silent) { |
41 | puts(s); |
42 | } |
43 | |
44 | fflush_stdout_and_exit(retval); |
45 | } |