/* vi: set sw=4 ts=4: */ /* * Disallocate virtual terminal(s) * * Copyright (C) 2003 by Tito Ragusa <farmatito@tiscali.it> * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> * * Licensed under GPLv2 or later, see file LICENSE in this source tree. */ //config:config DEALLOCVT //config: bool "deallocvt" //config: default y //config: select PLATFORM_LINUX //config: help //config: This program deallocates unused virtual consoles. //applet:IF_DEALLOCVT(APPLET(deallocvt, BB_DIR_USR_BIN, BB_SUID_DROP)) //kbuild:lib-$(CONFIG_DEALLOCVT) += deallocvt.o //usage:#define deallocvt_trivial_usage //usage: "[N]" //usage:#define deallocvt_full_usage "\n\n" //usage: "Deallocate unused virtual terminal /dev/ttyN" #include "libbb.h" /* From <linux/vt.h> */ enum { VT_DISALLOCATE = 0x5608 }; /* free memory associated to vt */ int deallocvt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int deallocvt_main(int argc UNUSED_PARAM, char **argv) { /* num = 0 deallocate all unused consoles */ int num = 0; if (argv[1]) { if (argv[2]) bb_show_usage(); num = xatou_range(argv[1], 1, 63); } /* double cast suppresses "cast to ptr from int of different size" */ xioctl(get_console_fd_or_die(), VT_DISALLOCATE, (void *)(ptrdiff_t)num); return EXIT_SUCCESS; }