diff --git a/libc/kernel/common/linux/hdlc/ioctl.h b/libc/kernel/common/linux/hdlc/ioctl.h
new file mode 100644
index 0000000..c15a67f
--- /dev/null
+++ b/libc/kernel/common/linux/hdlc/ioctl.h
@@ -0,0 +1,57 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   This header was automatically generated from a Linux kernel header
+ ***   of the same name, to make information necessary for userspace to
+ ***   call into the kernel available to libc.  It contains only constants,
+ ***   structures, and macros generated from the original header, and thus,
+ ***   contains no copyrightable information.
+ ***
+ ****************************************************************************
+ ****************************************************************************/
+#ifndef __HDLC_IOCTL_H__
+#define __HDLC_IOCTL_H__
+
+typedef struct {
+ unsigned int clock_rate;
+ unsigned int clock_type;
+ unsigned short loopback;
+} sync_serial_settings;
+
+typedef struct {
+ unsigned int clock_rate;
+ unsigned int clock_type;
+ unsigned short loopback;
+ unsigned int slot_map;
+} te1_settings;
+
+typedef struct {
+ unsigned short encoding;
+ unsigned short parity;
+} raw_hdlc_proto;
+
+typedef struct {
+ unsigned int t391;
+ unsigned int t392;
+ unsigned int n391;
+ unsigned int n392;
+ unsigned int n393;
+ unsigned short lmi;
+ unsigned short dce;
+} fr_proto;
+
+typedef struct {
+ unsigned int dlci;
+} fr_proto_pvc;
+
+typedef struct {
+ unsigned int dlci;
+ char master[IFNAMSIZ];
+}fr_proto_pvc_info;
+
+typedef struct {
+ unsigned int interval;
+ unsigned int timeout;
+} cisco_proto;
+
+#endif