/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
/*	  All Rights Reserved  	*/

/*	THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T	*/
/*	The copyright notice above does not evidence any   	*/
/*	actual or intended publication of such source code.	*/

/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ifndef _SYS_UIO_H
#define	_SYS_UIO_H

#pragma ident	"@(#)uio.h	1.32	04/03/23 SMI"	/* SVr4.0 1.6 */

#include <sys/feature_tests.h>

#ifdef	__cplusplus
extern "C" {
#endif

#include <sys/types.h>

/*
 * I/O parameter information.  A uio structure describes the I/O which
 * is to be performed by an operation.  Typically the data movement will
 * be performed by a routine such as uiomove(), which updates the uio
 * structure to reflect what was done.
 */

#if	defined(_XPG4_2)
typedef struct iovec {
	void	*iov_base;
	size_t	iov_len;
} iovec_t;
#else
typedef struct iovec {
	caddr_t	iov_base;
#if defined(_LP64)
	size_t	iov_len;
#else
	long	iov_len;
#endif
} iovec_t;
#endif	/* defined(_XPG4_2) */

#if defined(_SYSCALL32)

/* Kernel's view of user ILP32 iovec struct */

typedef	struct iovec32 {
	caddr32_t	iov_base;
	int32_t		iov_len;
} iovec32_t;

#endif	/* _SYSCALL32 */

#if 	!defined(_XPG4_2) || defined(__EXTENSIONS__)
/*
 * Segment flag values.
 */
typedef enum uio_seg { UIO_USERSPACE, UIO_SYSSPACE, UIO_USERISPACE } uio_seg_t;

typedef struct uio {
	iovec_t	*uio_iov;	/* pointer to array of iovecs */
	int	uio_iovcnt;	/* number of iovecs */
	lloff_t	_uio_offset;	/* file offset */
	uio_seg_t uio_segflg;	/* address space (kernel or user) */
	short	uio_fmode;	/* file mode flags */
	lloff_t _uio_limit;	/* u-limit (maximum byte offset) */
	ssize_t	uio_resid;	/* residual count */
} uio_t;

#define	uio_loffset	_uio_offset._f
#if !defined(_LP64)
#define	uio_offset	_uio_offset._p._l
#else
#define	uio_offset	uio_loffset
#endif

#define	uio_llimit	_uio_limit._f
#if !defined(_LP64)
#define	uio_limit	_uio_limit._p._l
#else
#define	uio_limit	uio_llimit
#endif

/*
 * I/O direction.
 */
typedef enum uio_rw { UIO_READ, UIO_WRITE } uio_rw_t;
#endif /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */

#if	defined(_KERNEL)

int	uiomove(void *, size_t, enum uio_rw, uio_t *);
int	ureadc(int, uio_t *);	/* should be errno_t in future */
int	uwritec(struct uio *);
void	uioskip(uio_t *, size_t);
int	uiodup(uio_t *, uio_t *, iovec_t *, int);
int	uioipcopyin(void *, size_t, uio_t *, unsigned short *, int, int);

#else	/* defined(_KERNEL) */

#if 	defined(__STDC__)

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

#else	/* defined(__STDC__) */

extern ssize_t readv();
extern ssize_t writev();

#endif	/* defined(__STDC__) */

#endif	/* defined(_KERNEL) */

#ifdef	__cplusplus
}
#endif

#endif	/* _SYS_UIO_H */
