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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* University Copyright- Copyright (c) 1982, 1986, 1988
* The Regents of the University of California
* All Rights Reserved
*
* University Acknowledgment- Portions of this document are derived from
* software developed by the University of California, Berkeley, and its
* contributors.
*/
#ifndef _SYS_UIO_H
#define _SYS_UIO_H
#pragma ident "%Z%%M% %I% %E% SMI"
#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) */
uint16_t uio_fmode; /* file mode flags */
uint16_t uio_extflg; /* extended 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;
/*
* uio_extflg: extended flags
*
* NOTE: This flag will be used in uiomove to determine if non-temporal
* access, ie, access bypassing caches, should be used. Filesystems that
* don't initialize this field could experience suboptimal performance due to
* the random data the field contains.
*/
#define UIO_COPY_DEFAULT 0x0000 /* no special options to copy */
#define UIO_COPY_CACHED 0x0001 /* copy should not bypass caches */
#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);
#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 */
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