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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) 1999-2003 by Erik Andersen <andersen@codepoet.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* 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> */
static const int VT_DISALLOCATE = 0x5608; /* free memory associated to vt */
int deallocvt_main(int argc, char *argv[])
{
int fd, num = 0;
if (argc > 2) {
bb_show_usage();
}
fd = get_console_fd();
/* num=0 deallocate all unused consoles */
if (argc == 1) {
goto disallocate_all;
}
num = bb_xgetlarg(argv[1], 10, 0, INT_MAX);
switch (num) {
case 0:
bb_error_msg("0: illegal VT number");
break;
case 1:
bb_error_msg("VT 1 cannot be deallocated");
break;
default:
disallocate_all:
if (ioctl(fd, VT_DISALLOCATE, num)) {
bb_perror_msg_and_die("VT_DISALLOCATE");
}
return EXIT_SUCCESS;
}
return EXIT_FAILURE;
}
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