busybox/console-tools/deallocvt.c

/* vi: set sw=4 ts=4: */
/*
 * 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 tarball for details.
 */

/* no options, no getopt */

#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;
int deallocvt_main(int argc UNUSED_PARAM, char **argv)
{
	/* num = 0 deallocate all unused consoles */
	int num = 0;

	if (argv[1]) {
		if (argv[2])
			bb_show_usage();
		num = xatou_range(argv[1], 1, 63);
	}

	/* 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;
}
1	niro	532	/* vi: set sw=4 ts=4: */
2			/*
3			* Disallocate virtual terminal(s)
4			*
5			* Copyright (C) 2003 by Tito Ragusa <farmatito@tiscali.it>
6			* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
7			*
8			* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
9			*/
10
11			/* no options, no getopt */
12
13	niro	816	#include "libbb.h"
14	niro	532
15			/* From <linux/vt.h> */
16			enum { VT_DISALLOCATE = 0x5608 }; /* free memory associated to vt */
17
18	niro	816	int deallocvt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
19			int deallocvt_main(int argc UNUSED_PARAM, char **argv)
20	niro	532	{
21			/* num = 0 deallocate all unused consoles */
22			int num = 0;
23
24	niro	816	if (argv[1]) {
25			if (argv[2])
26			bb_show_usage();
27			num = xatou_range(argv[1], 1, 63);
28	niro	532	}
29
30	niro	816	/* double cast suppresses "cast to ptr from int of different size" */
31			xioctl(get_console_fd_or_die(), VT_DISALLOCATE, (void *)(ptrdiff_t)num);
32	niro	532	return EXIT_SUCCESS;
33			}