1 /* vi: set sw=4 ts=4: */
3 * Disallocate virtual terminal(s)
5 * Copyright (C) 2003 by Tito Ragusa <farmatito@tiscali.it>
6 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
8 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
10 //config:config DEALLOCVT
11 //config: bool "deallocvt (1.9 kb)"
13 //config: select PLATFORM_LINUX
15 //config: This program deallocates unused virtual consoles.
17 //applet:IF_DEALLOCVT(APPLET_NOEXEC(deallocvt, deallocvt, BB_DIR_USR_BIN, BB_SUID_DROP, deallocvt))
19 //kbuild:lib-$(CONFIG_DEALLOCVT) += deallocvt.o
21 //usage:#define deallocvt_trivial_usage
23 //usage:#define deallocvt_full_usage "\n\n"
24 //usage: "Deallocate unused virtual terminal /dev/ttyN"
28 /* From <linux/vt.h> */
29 enum { VT_DISALLOCATE = 0x5608 }; /* free memory associated to vt */
31 int deallocvt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
32 int deallocvt_main(int argc UNUSED_PARAM, char **argv)
34 /* num = 0 deallocate all unused consoles */
40 num = xatou_range(argv[1], 1, 63);
43 /* double cast suppresses "cast to ptr from int of different size" */
44 xioctl(get_console_fd_or_die(), VT_DISALLOCATE, (void *)(ptrdiff_t)num);