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 |