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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 <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include "busybox.h"
/* From <linux/vt.h> */
enum { VT_DISALLOCATE = 0x5608 }; /* free memory associated to vt */
int deallocvt_main(int argc, char *argv[])
{
/* num = 0 deallocate all unused consoles */
int num = 0;
switch (argc) {
case 2:
if ((num = bb_xgetlarg(argv[1], 10, 0, INT_MAX)) == 0) {
bb_error_msg_and_die("0: illegal VT number");
}
/* Fallthrough */
case 1:
break;
default:
bb_show_usage();
}
if (-1 == ioctl(get_console_fd(), VT_DISALLOCATE, num)) {
bb_perror_msg_and_die("VT_DISALLOCATE");
}
return EXIT_SUCCESS;
}
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