1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Disallocate virtual terminal(s)
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4 | *
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5 | * Copyright (C) 2003 by Tito Ragusa <farmatito@tiscali.it>
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6 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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7 | *
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8 | * This program is free software; you can redistribute it and/or modify
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9 | * it under the terms of the GNU General Public License as published by
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10 | * the Free Software Foundation; either version 2 of the License, or
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11 | * (at your option) any later version.
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12 | *
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13 | * This program is distributed in the hope that it will be useful,
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 | * GNU General Public License for more details.
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17 | *
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18 | * You should have received a copy of the GNU General Public License
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19 | * along with this program; if not, write to the Free Software
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20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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21 | */
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22 |
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23 | /* no options, no getopt */
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24 |
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25 | #include <stdlib.h>
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26 | #include <stdio.h>
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27 | #include <fcntl.h>
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28 | #include <sys/types.h>
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29 | #include <sys/ioctl.h>
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30 | #include "busybox.h"
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31 |
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32 | /* From <linux/vt.h> */
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33 | enum { VT_DISALLOCATE = 0x5608 }; /* free memory associated to vt */
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34 |
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35 | int deallocvt_main(int argc, char *argv[])
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36 | {
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37 | /* num = 0 deallocate all unused consoles */
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38 | int num = 0;
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39 |
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40 | switch (argc) {
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41 | case 2:
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42 | if ((num = bb_xgetlarg(argv[1], 10, 0, INT_MAX)) == 0) {
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43 | bb_error_msg_and_die("0: illegal VT number");
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44 | }
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45 | /* Fallthrough */
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46 | case 1:
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47 | break;
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48 | default:
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49 | bb_show_usage();
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50 | }
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51 |
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52 | if (-1 == ioctl(get_console_fd(), VT_DISALLOCATE, num)) {
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53 | bb_perror_msg_and_die("VT_DISALLOCATE");
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54 | }
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55 | return EXIT_SUCCESS;
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56 | }
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