* 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.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
/* no options, no getopt */
+//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);
-int deallocvt_main(int argc, char **argv)
+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;
- switch (argc) {
- case 2:
- num = xatoul_range(argv[1], 1, 63);
- /* Fallthrough */
- case 1:
- break;
- default:
- bb_show_usage();
+ if (argv[1]) {
+ if (argv[2])
+ bb_show_usage();
+ num = xatou_range(argv[1], 1, 63);
}
- xioctl(get_console_fd(), VT_DISALLOCATE, (void *)num);
+ /* 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;
}