source: MondoRescue/branches/2.2.5/mindi-busybox/console-tools/deallocvt.c@ 1765

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

    switch (argc) {
    case 2:
        num = xatou_range(argv[1], 1, 63);
        /* Fallthrough */
    case 1:
        break;
    default:
        bb_show_usage();
    }

    /* double cast suppresses "cast to ptr from int of different size */
    xioctl(get_console_fd(), VT_DISALLOCATE, (void *)(ptrdiff_t)num);
    return EXIT_SUCCESS;
}