blob: 37c966af33560ece1b9653b3298158e0624bf1a1
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" |
12 | //config: default y |
13 | //config: select PLATFORM_LINUX |
14 | //config: help |
15 | //config: This program deallocates unused virtual consoles. |
16 | |
17 | //applet:IF_DEALLOCVT(APPLET(deallocvt, BB_DIR_USR_BIN, BB_SUID_DROP)) |
18 | |
19 | //kbuild:lib-$(CONFIG_DEALLOCVT) += deallocvt.o |
20 | |
21 | //usage:#define deallocvt_trivial_usage |
22 | //usage: "[N]" |
23 | //usage:#define deallocvt_full_usage "\n\n" |
24 | //usage: "Deallocate unused virtual terminal /dev/ttyN" |
25 | |
26 | #include "libbb.h" |
27 | |
28 | /* From <linux/vt.h> */ |
29 | enum { VT_DISALLOCATE = 0x5608 }; /* free memory associated to vt */ |
30 | |
31 | int deallocvt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
32 | int deallocvt_main(int argc UNUSED_PARAM, char **argv) |
33 | { |
34 | /* num = 0 deallocate all unused consoles */ |
35 | int num = 0; |
36 | |
37 | if (argv[1]) { |
38 | if (argv[2]) |
39 | bb_show_usage(); |
40 | num = xatou_range(argv[1], 1, 63); |
41 | } |
42 | |
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); |
45 | return EXIT_SUCCESS; |
46 | } |
47 |