/*-

  * 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_ */