blob: b131c0a64985e61adc42948b0a65d527b8655f0c
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 | |
11 | /* no options, no getopt */ |
12 | |
13 | //usage:#define deallocvt_trivial_usage |
14 | //usage: "[N]" |
15 | //usage:#define deallocvt_full_usage "\n\n" |
16 | //usage: "Deallocate unused virtual terminal /dev/ttyN" |
17 | |
18 | #include "libbb.h" |
19 | |
20 | /* From <linux/vt.h> */ |
21 | enum { VT_DISALLOCATE = 0x5608 }; /* free memory associated to vt */ |
22 | |
23 | int deallocvt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
24 | int deallocvt_main(int argc UNUSED_PARAM, char **argv) |
25 | { |
26 | /* num = 0 deallocate all unused consoles */ |
27 | int num = 0; |
28 | |
29 | if (argv[1]) { |
30 | if (argv[2]) |
31 | bb_show_usage(); |
32 | num = xatou_range(argv[1], 1, 63); |
33 | } |
34 | |
35 | /* double cast suppresses "cast to ptr from int of different size" */ |
36 | xioctl(get_console_fd_or_die(), VT_DISALLOCATE, (void *)(ptrdiff_t)num); |
37 | return EXIT_SUCCESS; |
38 | } |
39 |