diff --git a/headers/posix/sys/uio.h b/headers/posix/sys/uio.h
new file mode 100644
index 0000000000..7a7baafad7
--- /dev/null
+++ b/headers/posix/sys/uio.h
@@ -0,0 +1,41 @@
+/* uio.h */
+
+#ifndef _SYS_UIO_H
+#define _SYS_UIO_H
+
+#include <ktypes.h>
+
+typedef struct iovec {
+	void  *iov_base;
+	size_t iov_len;
+} iovec;
+
+
+#ifdef _KERNEL_MODE
+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 */
+};
+
+int uiomove(char *cp, int n, struct uio *uio);
+#endif
+
+ssize_t readv(int fd, const struct iovec *vector, size_t count);
+ssize_t readv_pos(int fd, off_t pos, const struct iovec *vec, size_t count);
+ssize_t writev(int fd, const struct iovec *vector, size_t count);
+ssize_t writev_pos(int fd, off_t pos, const struct iovec *vec, size_t count);
+
+#endif /* _SYS_UIO_H */