busybox/console-tools/deallocvt.c

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/* vi: set sw=4 ts=4: */
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/*
* Disallocate virtual terminal(s)
*
* Copyright (C) 2003 by Tito Ragusa <farmatito@tiscali.it>
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
/* no options, no getopt */
//usage:#define deallocvt_trivial_usage
//usage: "[N]"
//usage:#define deallocvt_full_usage "\n\n"
//usage: "Deallocate unused virtual terminal /dev/ttyN"
#include "libbb.h"
/* From <linux/vt.h> */
enum { VT_DISALLOCATE = 0x5608 }; /* free memory associated to vt */
int deallocvt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int deallocvt_main(int argc UNUSED_PARAM, char **argv)
{
/* num = 0 deallocate all unused consoles */
int num = 0;
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if (argv[1]) {
if (argv[2])
bb_show_usage();
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num = xatou_range(argv[1], 1, 63);
}
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/* double cast suppresses "cast to ptr from int of different size" */
xioctl(get_console_fd_or_die(), VT_DISALLOCATE, (void *)(ptrdiff_t)num);
return EXIT_SUCCESS;
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}