1 files changed, 33 insertions, 0 deletions
diff --git a/console-tools/deallocvt.c b/console-tools/deallocvt.c
new file mode 100644
index 0000000..0974883
--- /dev/null
+++ b/console-tools/deallocvt.c
@@ -0,0 +1,33 @@
+/* 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 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;
+}