1 files changed, 37 insertions, 0 deletions
diff --git a/console-tools/deallocvt.c b/console-tools/deallocvt.c
new file mode 100644
index 000000000..cd581b1c8
--- /dev/null
+++ b/console-tools/deallocvt.c
@@ -0,0 +1,37 @@
+/* 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 "busybox.h"
+
+/* From <linux/vt.h> */
+enum { VT_DISALLOCATE = 0x5608 }; /* free memory associated to vt */
+
+int deallocvt_main(int argc, 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 (-1 == ioctl(get_console_fd(), VT_DISALLOCATE, num)) {
+		bb_perror_msg_and_die("VT_DISALLOCATE");
+	}
+	return EXIT_SUCCESS;
+}