busybox/console-tools/deallocvt.c

47 lines
1.3 KiB
C
Raw Normal View History

/* vi: set sw=4 ts=4: */
1999-10-26 05:02:44 +05:30
/*
* 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.
1999-10-26 05:02:44 +05:30
*/
//config:config DEALLOCVT
//config: bool "deallocvt (1.9 kb)"
//config: default y
//config: select PLATFORM_LINUX
//config: help
//config: This program deallocates unused virtual consoles.
//applet:IF_DEALLOCVT(APPLET_NOEXEC(deallocvt, deallocvt, BB_DIR_USR_BIN, BB_SUID_DROP, deallocvt))
//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;
2008-07-05 14:48:54 +05:30
int deallocvt_main(int argc UNUSED_PARAM, char **argv)
{
/* num = 0 deallocate all unused consoles */
int num = 0;
1999-10-26 05:02:44 +05:30
if (argv[1]) {
if (argv[2])
bb_show_usage();
2007-08-23 16:22:52 +05:30
num = xatou_range(argv[1], 1, 63);
}
2007-10-30 01:22:21 +05:30
/* 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;
1999-10-26 05:02:44 +05:30
}