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38 lines
868 B
C
38 lines
868 B
C
/* vi: set sw=4 ts=4: */
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/*
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* Disallocate virtual terminal(s)
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*
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* Copyright (C) 2003 by Tito Ragusa <farmatito@tiscali.it>
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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/* no options, no getopt */
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#include "libbb.h"
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/* From <linux/vt.h> */
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enum { VT_DISALLOCATE = 0x5608 }; /* free memory associated to vt */
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int deallocvt_main(int argc, char **argv);
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int deallocvt_main(int argc, char **argv)
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{
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/* num = 0 deallocate all unused consoles */
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int num = 0;
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switch (argc) {
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case 2:
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num = xatou_range(argv[1], 1, 63);
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/* Fallthrough */
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case 1:
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break;
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default:
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bb_show_usage();
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}
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/* double cast suppresses "cast to ptr from int of different size */
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xioctl(get_console_fd(), VT_DISALLOCATE, (void *)(ptrdiff_t)num);
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return EXIT_SUCCESS;
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}
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