busybox/console-tools/deallocvt.c
Denis Vlasenko 9b49a5ed85 add -fvisibility=hidden to CC flags, mark XXX_main functions
EXTERNALLY_VISIBLE. 5% size reduction of libbusybox.so
2007-10-11 10:05:36 +00:00

38 lines
892 B
C

/* 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 tarball for details.
*/
/* no options, no getopt */
#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, char **argv)
{
/* num = 0 deallocate all unused consoles */
int num = 0;
switch (argc) {
case 2:
num = xatou_range(argv[1], 1, 63);
/* Fallthrough */
case 1:
break;
default:
bb_show_usage();
}
/* double cast suppresses "cast to ptr from int of different size */
xioctl(get_console_fd(), VT_DISALLOCATE, (void *)(ptrdiff_t)num);
return EXIT_SUCCESS;
}