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[821] | 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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[1765] | 8 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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[821] | 9 | */
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| 10 |
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| 11 | /* no options, no getopt */
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| 12 |
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[1765] | 13 | #include "libbb.h"
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[821] | 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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[1765] | 18 | int deallocvt_main(int argc, char **argv);
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| 19 | int deallocvt_main(int argc, char **argv)
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[821] | 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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[1765] | 25 | case 2:
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| 26 | num = xatou_range(argv[1], 1, 63);
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[821] | 27 | /* Fallthrough */
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[1765] | 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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[821] | 32 | }
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| 33 |
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[1765] | 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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[821] | 36 | return EXIT_SUCCESS;
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| 37 | }
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