47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Disallocate virtual terminal(s)
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*
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* Copyright (C) 2003 by Tito Ragusa <farmatito@tiscali.it>
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//config:config DEALLOCVT
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//config: bool "deallocvt (1.9 kb)"
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//config: default y
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//config: select PLATFORM_LINUX
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//config: help
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//config: This program deallocates unused virtual consoles.
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//applet:IF_DEALLOCVT(APPLET_NOEXEC(deallocvt, deallocvt, BB_DIR_USR_BIN, BB_SUID_DROP, deallocvt))
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//kbuild:lib-$(CONFIG_DEALLOCVT) += deallocvt.o
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//usage:#define deallocvt_trivial_usage
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//usage: "[N]"
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//usage:#define deallocvt_full_usage "\n\n"
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//usage: "Deallocate unused virtual terminal /dev/ttyN"
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#include "libbb.h"
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/* From <linux/vt.h> */
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enum { VT_DISALLOCATE = 0x5608 }; /* free memory associated to vt */
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int deallocvt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int deallocvt_main(int argc UNUSED_PARAM, char **argv)
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{
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/* num = 0 deallocate all unused consoles */
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int num = 0;
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if (argv[1]) {
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if (argv[2])
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bb_show_usage();
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num = xatou_range(argv[1], 1, 63);
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}
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/* double cast suppresses "cast to ptr from int of different size" */
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xioctl(get_console_fd_or_die(), VT_DISALLOCATE, (void *)(ptrdiff_t)num);
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return EXIT_SUCCESS;
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}
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