1/* 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#include "libbb.h" 14 15/* From <linux/vt.h> */ 16enum { VT_DISALLOCATE = 0x5608 }; /* free memory associated to vt */ 17 18int deallocvt_main(int argc, char **argv); 19int deallocvt_main(int argc, char **argv) 20{ 21 /* num = 0 deallocate all unused consoles */ 22 int num = 0; 23 24 switch (argc) { 25 case 2: 26 num = xatou_range(argv[1], 1, 63); 27 /* Fallthrough */ 28 case 1: 29 break; 30 default: 31 bb_show_usage(); 32 } 33 34 /* double cast suppresses "cast to ptr from int of different size */ 35 xioctl(get_console_fd(), VT_DISALLOCATE, (void *)(ptrdiff_t)num); 36 return EXIT_SUCCESS; 37} 38