114 lines
3.0 KiB
C
114 lines
3.0 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
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/* All Rights Reserved */
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/*
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* University Copyright- Copyright (c) 1982, 1986, 1988
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* The Regents of the University of California
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* All Rights Reserved
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*
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* University Acknowledgment- Portions of this document are derived from
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* software developed by the University of California, Berkeley, and its
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* contributors.
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*/
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#ifndef _LIBSPL_SYS_UIO_H
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#define _LIBSPL_SYS_UIO_H
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#include <sys/types.h>
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#include_next <sys/uio.h>
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#ifdef __APPLE__
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#include <sys/_types/_iovec_t.h>
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#endif
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#include <stdint.h>
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typedef struct iovec iovec_t;
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#if defined(__linux__) || defined(__APPLE__)
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typedef enum uio_rw {
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UIO_READ = 0,
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UIO_WRITE = 1,
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} uio_rw_t;
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typedef enum uio_seg {
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UIO_USERSPACE = 0,
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UIO_SYSSPACE = 1,
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UIO_USERISPACE = 2,
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} uio_seg_t;
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#elif defined(__FreeBSD__)
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typedef enum uio_seg uio_seg_t;
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#endif
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typedef struct uio {
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struct iovec *uio_iov; /* pointer to array of iovecs */
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int uio_iovcnt; /* number of iovecs */
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offset_t uio_loffset; /* file offset */
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uio_seg_t uio_segflg; /* address space (kernel or user) */
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uint16_t uio_fmode; /* file mode flags */
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uint16_t uio_extflg; /* extended flags */
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ssize_t uio_resid; /* residual count */
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} uio_t;
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#define uio_segflg(uio) (uio)->uio_segflg
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#define uio_offset(uio) (uio)->uio_loffset
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#define uio_resid(uio) (uio)->uio_resid
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#define uio_iovcnt(uio) (uio)->uio_iovcnt
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#define uio_iovlen(uio, idx) (uio)->uio_iov[(idx)].iov_len
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#define uio_iovbase(uio, idx) (uio)->uio_iov[(idx)].iov_base
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static inline void
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uio_iov_at_index(uio_t *uio, uint_t idx, void **base, uint64_t *len)
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{
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*base = uio_iovbase(uio, idx);
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*len = uio_iovlen(uio, idx);
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}
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static inline void
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uio_advance(uio_t *uio, size_t size)
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{
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uio->uio_resid -= size;
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uio->uio_loffset += size;
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}
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static inline offset_t
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uio_index_at_offset(uio_t *uio, offset_t off, uint_t *vec_idx)
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{
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*vec_idx = 0;
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while (*vec_idx < (uint_t)uio_iovcnt(uio) &&
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off >= (offset_t)uio_iovlen(uio, *vec_idx)) {
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off -= uio_iovlen(uio, *vec_idx);
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(*vec_idx)++;
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}
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return (off);
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}
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#endif /* _SYS_UIO_H */
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