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 | * This program is free software; you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation; either version 2 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * This program is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 | * General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with this program; if not, write to the Free Software
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19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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20 | *
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21 | */
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22 |
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23 | /* BB_AUDIT SUSv3 compliant */
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24 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/tty.html */
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25 |
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26 | #include <stdio.h>
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27 | #include <stdlib.h>
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28 | #include <unistd.h>
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29 | #include "busybox.h"
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30 |
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31 | int tty_main(int argc, char **argv)
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32 | {
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33 | const char *s;
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34 | int silent; /* Note: No longer relevant in SUSv3. */
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35 | int retval;
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36 |
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37 | bb_default_error_retval = 2; /* SUSv3 requires > 1 for error. */
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38 |
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39 | silent = bb_getopt_ulflags(argc, argv, "s");
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40 |
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41 | /* gnu tty outputs a warning that it is ignoring all args. */
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42 | bb_warn_ignoring_args(argc - optind);
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43 |
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44 | retval = 0;
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45 |
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46 | if ((s = ttyname(0)) == NULL) {
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47 | /* According to SUSv3, ttyname can on fail with EBADF or ENOTTY.
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48 | * We know the file descriptor is good, so failure means not a tty. */
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49 | s = "not a tty";
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50 | retval = 1;
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51 | }
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52 |
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53 | if (!silent) {
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54 | puts(s);
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55 | }
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56 |
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57 | bb_fflush_stdout_and_exit(retval);
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58 | }
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