diff --git a/libc/kernel/uapi/linux/isdn.h b/libc/kernel/uapi/linux/isdn.h
new file mode 100644
index 0000000..129b2d4
--- /dev/null
+++ b/libc/kernel/uapi/linux/isdn.h
@@ -0,0 +1,151 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   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.
+ ***
+ ***   To edit the content of this header, modify the corresponding
+ ***   source file (e.g. under external/kernel-headers/original/) then
+ ***   run bionic/libc/kernel/tools/update_all.py
+ ***
+ ***   Any manual change here will be lost the next time this script will
+ ***   be run. You've been warned!
+ ***
+ ****************************************************************************
+ ****************************************************************************/
+#ifndef _UAPI__ISDN_H__
+#define _UAPI__ISDN_H__
+#include <linux/ioctl.h>
+#include <linux/tty.h>
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define ISDN_MAX_DRIVERS 32
+#define ISDN_MAX_CHANNELS 64
+#define IIOCNETAIF _IO('I',1)
+#define IIOCNETDIF _IO('I',2)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define IIOCNETSCF _IO('I',3)
+#define IIOCNETGCF _IO('I',4)
+#define IIOCNETANM _IO('I',5)
+#define IIOCNETDNM _IO('I',6)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define IIOCNETGNM _IO('I',7)
+#define IIOCGETSET _IO('I',8)
+#define IIOCSETSET _IO('I',9)
+#define IIOCSETVER _IO('I',10)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define IIOCNETHUP _IO('I',11)
+#define IIOCSETGST _IO('I',12)
+#define IIOCSETBRJ _IO('I',13)
+#define IIOCSIGPRF _IO('I',14)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define IIOCGETPRF _IO('I',15)
+#define IIOCSETPRF _IO('I',16)
+#define IIOCGETMAP _IO('I',17)
+#define IIOCSETMAP _IO('I',18)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define IIOCNETASL _IO('I',19)
+#define IIOCNETDIL _IO('I',20)
+#define IIOCGETCPS _IO('I',21)
+#define IIOCGETDVR _IO('I',22)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define IIOCNETLCR _IO('I',23)
+#define IIOCNETDWRSET _IO('I',24)
+#define IIOCNETALN _IO('I',32)
+#define IIOCNETDLN _IO('I',33)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define IIOCNETGPN _IO('I',34)
+#define IIOCDBGVAR _IO('I',127)
+#define IIOCDRVCTL _IO('I',128)
+#define SIOCGKEEPPERIOD (SIOCDEVPRIVATE + 0)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define SIOCSKEEPPERIOD (SIOCDEVPRIVATE + 1)
+#define SIOCGDEBSERINT (SIOCDEVPRIVATE + 2)
+#define SIOCSDEBSERINT (SIOCDEVPRIVATE + 3)
+#define ISDN_NET_ENCAP_ETHER 0
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define ISDN_NET_ENCAP_RAWIP 1
+#define ISDN_NET_ENCAP_IPTYP 2
+#define ISDN_NET_ENCAP_CISCOHDLC 3
+#define ISDN_NET_ENCAP_SYNCPPP 4
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define ISDN_NET_ENCAP_UIHDLC 5
+#define ISDN_NET_ENCAP_CISCOHDLCK 6
+#define ISDN_NET_ENCAP_X25IFACE 7
+#define ISDN_NET_ENCAP_MAX_ENCAP ISDN_NET_ENCAP_X25IFACE
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define ISDN_USAGE_NONE 0
+#define ISDN_USAGE_RAW 1
+#define ISDN_USAGE_MODEM 2
+#define ISDN_USAGE_NET 3
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define ISDN_USAGE_VOICE 4
+#define ISDN_USAGE_FAX 5
+#define ISDN_USAGE_MASK 7
+#define ISDN_USAGE_DISABLED 32
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define ISDN_USAGE_EXCLUSIVE 64
+#define ISDN_USAGE_OUTGOING 128
+#define ISDN_MODEM_NUMREG 24
+#define ISDN_LMSNLEN 255
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define ISDN_CMSGLEN 50
+#define ISDN_MSNLEN 32
+#define NET_DV 0x06
+#define TTY_DV 0x06
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define INF_DV 0x01
+typedef struct {
+ char drvid[25];
+ unsigned long arg;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+} isdn_ioctl_struct;
+typedef struct {
+ char name[10];
+ char phone[ISDN_MSNLEN];
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ int outgoing;
+} isdn_net_ioctl_phone;
+typedef struct {
+ char name[10];
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ char master[10];
+ char slave[10];
+ char eaz[256];
+ char drvid[25];
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ int onhtime;
+ int charge;
+ int l2_proto;
+ int l3_proto;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ int p_encap;
+ int exclusive;
+ int dialmax;
+ int slavedelay;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ int cbdelay;
+ int chargehup;
+ int ihup;
+ int secure;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ int callback;
+ int cbhup;
+ int pppbind;
+ int chargeint;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ int triggercps;
+ int dialtimeout;
+ int dialwait;
+ int dialmode;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+} isdn_net_ioctl_cfg;
+#define ISDN_NET_DIALMODE_MASK 0xC0
+#define ISDN_NET_DM_OFF 0x00
+#define ISDN_NET_DM_MANUAL 0x40
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define ISDN_NET_DM_AUTO 0x80
+#define ISDN_NET_DIALMODE(x) ((&(x))->flags & ISDN_NET_DIALMODE_MASK)
+#endif