uio.h revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* 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
* 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
/*
* 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;
} iovec_t;
#else
typedef struct iovec {
#if defined(_LP64)
#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 {
} iovec32_t;
#endif /* _SYSCALL32 */
#if !defined(_XPG4_2) || defined(__EXTENSIONS__)
/*
* Segment flag values.
*/
typedef struct uio {
int uio_iovcnt; /* number of iovecs */
} uio_t;
#if !defined(_LP64)
#else
#define uio_offset uio_loffset
#endif
#if !defined(_LP64)
#else
#define uio_limit uio_llimit
#endif
/*
* I/O direction.
*/
/*
* 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.
*/
#endif /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */
#if defined(_KERNEL)
#else /* defined(_KERNEL) */
#if defined(__STDC__)
#else /* defined(__STDC__) */
#endif /* defined(__STDC__) */
#endif /* defined(_KERNEL) */
#ifdef __cplusplus
}
#endif
#endif /* _SYS_UIO_H */