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+/*
+ * Copyright (c) 1982, 1986, 1993, 1994
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)uio.h 8.5 (Berkeley) 2/22/94
+ * $Id$
+ */
+
+#ifndef _SYS_UIO_H_
+#define _SYS_UIO_H_
+
+/*
+ * XXX
+ * iov_base should be a void *.
+ */
+struct iovec {
+ char *iov_base; /* Base address. */
+ size_t iov_len; /* Length. */
+};
+
+enum uio_rw { UIO_READ, UIO_WRITE };
+
+/* Segment flag values. */
+enum uio_seg {
+ UIO_USERSPACE, /* from user data space */
+ UIO_SYSSPACE, /* from system space */
+ UIO_USERISPACE, /* from user I space */
+ UIO_NOCOPY /* don't copy, already in object */
+};
+
+#ifdef KERNEL
+struct uio {
+ struct iovec *uio_iov;
+ int uio_iovcnt;
+ off_t uio_offset;
+ int uio_resid;
+ enum uio_seg uio_segflg;
+ enum uio_rw uio_rw;
+ struct proc *uio_procp;
+};
+
+/*
+ * Limits
+ */
+#define UIO_MAXIOV 1024 /* max 1K of iov's */
+#define UIO_SMALLIOV 8 /* 8 on stack, else malloc */
+#endif /* KERNEL */
+
+#ifdef KERNEL
+
+int uiomove __P((caddr_t, int, struct uio *));
+
+#else /* !KERNEL */
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+ssize_t readv __P((int, const struct iovec *, int));
+ssize_t writev __P((int, const struct iovec *, int));
+__END_DECLS
+
+#endif /* KERNEL */
+
+#endif /* !_SYS_UIO_H_ */