/*
 * 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	8.5.2 (2.11BSD GTE) 12/20/94
 *
 * Copied from 4.4-Lite and modified for 2.11BSD.  Modifications were removal
 * of prototypes, limits for dynamic allocation of iovec structs and changing
 * uio_resid to u_short from int.
 */

#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 */
};

#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 rmalloc */
#endif /* _KERNEL */

__BEGIN_DECLS
int	uiomove(void *, size_t, struct uio *);

#ifndef	_KERNEL
#include <sys/cdefs.h>

ssize_t	readv(int, const struct iovec *, u_int);
ssize_t	writev(int, const struct iovec *, u_int);
#endif /* !_KERNEL */

__END_DECLS
#endif /* !_SYS_UIO_H_ */
