diff --git a/headers/posix/sys/uio.h b/headers/posix/sys/uio.h
index 669a369694..29154592b1 100644
--- a/headers/posix/sys/uio.h
+++ b/headers/posix/sys/uio.h
@@ -14,6 +14,25 @@ typedef struct iovec {
 } iovec;
 
 
+enum    uio_rw { UIO_READ, UIO_WRITE };
+
+/* Segment flag values. */
+enum uio_seg {
+	UIO_USERSPACE,		/* from user data space */
+	UIO_SYSSPACE		/* from system space */
+};
+
+struct uio {
+	struct  iovec *uio_iov;		/* pointer to array of iovecs */
+	int     uio_iovcnt;			/* number of iovecs in array */
+	off_t   uio_offset;			/* offset into file this uio corresponds to */
+	size_t  uio_resid;			/* residual i/o count */
+	enum    uio_seg uio_segflg;	/* see above */
+	enum    uio_rw uio_rw;		/* see above */
+//	struct  proc *uio_procp;	/* process if UIO_USERSPACE */
+};
+
+
 #ifdef __cplusplus
 extern "C" {
 #endif
diff --git a/src/add-ons/kernel/network/core/core_private.h b/src/add-ons/kernel/network/core/core_private.h
index 8b3647b07f..9fbe390ad2 100644
--- a/src/add-ons/kernel/network/core/core_private.h
+++ b/src/add-ons/kernel/network/core/core_private.h
@@ -3,6 +3,9 @@
 
 
 struct ifnet;
+struct uio;
+
+int uiomove(char *cp, int n, struct uio *uio);
 
 void in_if_detach(struct ifnet *ifp);
 	// this removes all IP related references for this interface (route, address)