1 /* 2 * Copyright (c) 1982, 1986 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $Id$ 34 */ 35 36 #ifndef _UIO_H_ 37 #define _UIO_H_ 38 39 struct iovec { 40 caddr_t iov_base; 41 int iov_len; 42 }; 43 44 enum uio_rw { UIO_READ, UIO_WRITE }; 45 46 /* 47 * Segment flag values. 48 */ 49 enum uio_seg { 50 UIO_USERSPACE, /* from user data space */ 51 UIO_SYSSPACE, /* from system space */ 52 /* UIO_USERISPACE /* from user I space */ 53 }; 54 55 struct uio { 56 struct iovec *uio_iov; 57 int uio_iovcnt; 58 off_t uio_offset; 59 int uio_resid; 60 enum uio_seg uio_segflg; 61 enum uio_rw uio_rw; 62 struct proc *uio_procp; 63 }; 64 65 /* 66 * Limits 67 */ 68 #define UIO_MAXIOV 1024 /* max 1K of iov's */ 69 #define UIO_SMALLIOV 8 /* 8 on stack, else malloc */ 70 71 #ifndef KERNEL 72 73 #include <sys/cdefs.h> 74 75 __BEGIN_DECLS 76 int readv __P((int, const struct iovec *, int)); 77 int writev __P((int, const struct iovec *, int)); 78 __END_DECLS 79 80 #else 81 struct iovec *uio_advance(struct uio *uio, struct iovec *iov, int cnt); 82 int uiomove(caddr_t cp, int len, struct uio *uio); 83 84 /* 85 * Advance a uio and its iov by cnt bytes, returning next iov. 86 */ 87 extern inline struct iovec * 88 uio_advance(struct uio *uio, struct iovec *iov, int cnt) { 89 90 /* consume an iov, possibly fetching the next one */ 91 iov->iov_base += cnt; 92 iov->iov_len -= cnt; 93 if (iov->iov_len == 0) { 94 iov = ++uio->uio_iov; 95 uio->uio_iovcnt--; 96 } 97 98 uio->uio_resid -= cnt; 99 uio->uio_offset += cnt; 100 101 return (iov); 102 } 103 104 #define uio_base(uio) (uio)->uio_iov->iov_base 105 #define uio_len(uio) (uio)->uio_iov->iov_len 106 107 #endif /* !KERNEL */ 108 109 #endif /* !_UIO_H_ */ 110