source:
MondoRescue/branches/2.2.9/mindi-busybox/coreutils/tty.c@
3721
Last change on this file since 3721 was 3320, checked in by , 10 years ago | |
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[3320] | 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 source tree. | |
8 | */ | |
9 | ||
10 | /* BB_AUDIT SUSv4 compliant */ | |
11 | /* http://www.opengroup.org/onlinepubs/9699919799/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 UNUSED_PARAM, char **argv) | |
17 | { | |
18 | const char *s; | |
19 | IF_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 | IF_INCLUDE_SUSv2(silent = getopt32(argv, "s");) | |
25 | IF_INCLUDE_SUSv2(argv += optind;) | |
26 | IF_NOT_INCLUDE_SUSv2(argv += 1;) | |
27 | ||
28 | /* gnu tty outputs a warning that it is ignoring all args. */ | |
29 | bb_warn_ignoring_args(argv[0]); | |
30 | ||
31 | retval = EXIT_SUCCESS; | |
32 | ||
33 | s = xmalloc_ttyname(STDIN_FILENO); | |
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 = EXIT_FAILURE; | |
39 | } | |
40 | IF_INCLUDE_SUSv2(if (!silent) puts(s);) | |
41 | IF_NOT_INCLUDE_SUSv2(puts(s);) | |
42 | ||
43 | fflush_stdout_and_exit(retval); | |
44 | } |
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