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/* 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 ATTRIBUTE_UNUSED, 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(), VT_DISALLOCATE, (void *)(ptrdiff_t)num);
return EXIT_SUCCESS;
}
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