/*-

 * 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.

 * 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.

 * © Portions copyright (c) 2007 Symbian Software Ltd. All rights reserved.

 *	@(#)uio.h	8.5 (Berkeley) 2/22/94

 * $FreeBSD: src/sys/sys/uio.h,v 1.39 2005/07/07 18:17:55 jhb Exp $

 */

#ifndef _SYS_UIO_H_

#define	_SYS_UIO_H_

#include <sys/cdefs.h>

#include <sys/_types.h>

#include <sys/_iovec.h>

#ifndef _SSIZE_T_DECLARED

typedef	__ssize_t	ssize_t;

#define	_SSIZE_T_DECLARED

#endif

#ifndef _OFF_T_DECLARED

typedef	__off_t	off_t;

#define	_OFF_T_DECLARED

#endif

#if __BSD_VISIBLE

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_NOCOPY		/* don't copy, already in object */

};

#endif

#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	thread *uio_td;

};

/*

 * Limits

 *

 * N.B.: UIO_MAXIOV must be no less than IOV_MAX from <sys/syslimits.h>

 * which in turn must be no less than _XOPEN_IOV_MAX from <limits.h>.  If

 * we ever make this tunable (probably pointless), then IOV_MAX should be

 * removed from <sys/syslimits.h> and applications would be expected to use

 * sysconf(3) to find out the correct value, or else assume the worst

 * (_XOPEN_IOV_MAX).  Perhaps UIO_MAXIOV should be simply defined as

 * IOV_MAX.

 */

#define UIO_MAXIOV	1024		/* max 1K of iov's */

struct vm_object;

struct vm_page;

#else /* !_KERNEL */

__BEGIN_DECLS

IMPORT_C

ssize_t	readv(int, const struct iovec *, int);

IMPORT_C

ssize_t	writev(int, const struct iovec *, int);

__END_DECLS

#endif /* _KERNEL */

#endif /* !_SYS_UIO_H_ */