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 source tree. 9 */ 10//config:config DEALLOCVT 11//config: bool "deallocvt (1.9 kb)" 12//config: default y 13//config: help 14//config: This program deallocates unused virtual consoles. 15 16//applet:IF_DEALLOCVT(APPLET_NOEXEC(deallocvt, deallocvt, BB_DIR_USR_BIN, BB_SUID_DROP, deallocvt)) 17 18//kbuild:lib-$(CONFIG_DEALLOCVT) += deallocvt.o 19 20//usage:#define deallocvt_trivial_usage 21//usage: "[N]" 22//usage:#define deallocvt_full_usage "\n\n" 23//usage: "Deallocate unused virtual terminal /dev/ttyN" 24 25#include "libbb.h" 26 27/* From <linux/vt.h> */ 28enum { VT_DISALLOCATE = 0x5608 }; /* free memory associated to vt */ 29 30int deallocvt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; 31int deallocvt_main(int argc UNUSED_PARAM, char **argv) 32{ 33 /* num = 0 deallocate all unused consoles */ 34 int num = 0; 35 36 if (argv[1]) { 37 if (argv[2]) 38 bb_show_usage(); 39 num = xatou_range(argv[1], 1, 63); 40 } 41 42 /* double cast suppresses "cast to ptr from int of different size" */ 43 xioctl(get_console_fd_or_die(), VT_DISALLOCATE, (void *)(ptrdiff_t)num); 44 return EXIT_SUCCESS; 45} 46