Contents of /tags/mkinitrd-6_1_5/busybox/coreutils/tty.c
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Wed Aug 5 17:52:52 2009 UTC (15 years, 1 month ago) by niro
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Wed Aug 5 17:52:52 2009 UTC (15 years, 1 month ago) by niro
File MIME type: text/plain
File size: 1175 byte(s)
tagged 'mkinitrd-6_1_5'
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 "libbb.h" |
14 | |
15 | int tty_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
16 | int tty_main(int argc, char **argv SKIP_INCLUDE_SUSv2(UNUSED_PARAM)) |
17 | { |
18 | const char *s; |
19 | USE_INCLUDE_SUSv2(int silent;) /* Note: No longer relevant in SUSv3. */ |
20 | int retval; |
21 | |
22 | xfunc_error_retval = 2; /* SUSv3 requires > 1 for error. */ |
23 | |
24 | USE_INCLUDE_SUSv2(silent = getopt32(argv, "s");) |
25 | USE_INCLUDE_SUSv2(argc -= optind;) |
26 | SKIP_INCLUDE_SUSv2(argc -= 1;) |
27 | |
28 | /* gnu tty outputs a warning that it is ignoring all args. */ |
29 | bb_warn_ignoring_args(argc); |
30 | |
31 | retval = 0; |
32 | |
33 | s = ttyname(0); |
34 | if (s == NULL) { |
35 | /* According to SUSv3, ttyname can fail with EBADF or ENOTTY. |
36 | * We know the file descriptor is good, so failure means not a tty. */ |
37 | s = "not a tty"; |
38 | retval = 1; |
39 | } |
40 | USE_INCLUDE_SUSv2(if (!silent) puts(s);) |
41 | SKIP_INCLUDE_SUSv2(puts(s);) |
42 | |
43 | fflush_stdout_and_exit(retval); |
44 | } |