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1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * tty implementation for busybox
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4 | *
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5 | * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
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6 | *
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7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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8 | */
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9 |
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10 | /* BB_AUDIT SUSv3 compliant */
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11 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/tty.html */
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12 |
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13 | #include "libbb.h"
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14 |
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15 | int tty_main(int argc, char **argv);
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16 | int tty_main(int argc, char **argv)
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17 | {
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18 | const char *s;
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19 | USE_INCLUDE_SUSv2(int silent;) /* Note: No longer relevant in SUSv3. */
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20 | int retval;
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21 |
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22 | xfunc_error_retval = 2; /* SUSv3 requires > 1 for error. */
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23 |
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24 | USE_INCLUDE_SUSv2(silent = getopt32(argv, "s");)
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25 |
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26 | /* gnu tty outputs a warning that it is ignoring all args. */
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27 | bb_warn_ignoring_args(argc - optind);
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28 |
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29 | retval = 0;
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30 |
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31 | s = ttyname(0);
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32 | if (s == NULL) {
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33 | /* According to SUSv3, ttyname can on fail with EBADF or ENOTTY.
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34 | * We know the file descriptor is good, so failure means not a tty. */
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35 | s = "not a tty";
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36 | retval = 1;
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37 | }
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38 | USE_INCLUDE_SUSv2(if (!silent) puts(s);)
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39 | SKIP_INCLUDE_SUSv2(puts(s);)
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40 |
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41 | fflush_stdout_and_exit(retval);
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42 | }
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