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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 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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9 | */
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10 |
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11 | /* no options, no getopt */
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12 |
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13 | #include "libbb.h"
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14 |
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15 | /* From <linux/vt.h> */
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16 | enum { VT_DISALLOCATE = 0x5608 }; /* free memory associated to vt */
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17 |
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18 | int deallocvt_main(int argc, char **argv);
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19 | int deallocvt_main(int argc, char **argv)
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20 | {
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21 | /* num = 0 deallocate all unused consoles */
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22 | int num = 0;
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23 |
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24 | switch (argc) {
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25 | case 2:
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26 | num = xatou_range(argv[1], 1, 63);
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27 | /* Fallthrough */
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28 | case 1:
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29 | break;
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30 | default:
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31 | bb_show_usage();
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32 | }
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33 |
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34 | /* double cast suppresses "cast to ptr from int of different size */
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35 | xioctl(get_console_fd(), VT_DISALLOCATE, (void *)(ptrdiff_t)num);
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36 | return EXIT_SUCCESS;
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37 | }
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