1 /* 2 * Copyright (c) 1982, 1986, 1993, 1994 3 * The Regents of the University of California. 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 * @(#)uio.h 8.5 (Berkeley) 2/22/94 34 * $FreeBSD: src/sys/sys/uio.h,v 1.11.2.1 2001/09/28 16:58:35 dillon Exp $ 35 * $DragonFly: src/sys/sys/uio.h,v 1.14 2006/05/27 20:17:17 dillon Exp $ 36 */ 37 38 #ifndef _SYS_UIO_H_ 39 #define _SYS_UIO_H_ 40 41 #include <sys/_iovec.h> 42 43 #ifndef _SYS_TYPES_H_ 44 #include <sys/types.h> 45 #endif 46 #ifndef _SYS_PARAM_H_ 47 #include <sys/param.h> 48 #endif 49 #ifndef _SYS_MALLOC_H_ 50 #include <sys/malloc.h> /* Needed to inline iovec_free(). */ 51 #endif 52 53 enum uio_rw { UIO_READ, UIO_WRITE }; 54 55 /* Segment flag values. */ 56 enum uio_seg { 57 UIO_USERSPACE, /* from user data space */ 58 UIO_SYSSPACE, /* from system space */ 59 UIO_NOCOPY /* don't copy, already in object */ 60 }; 61 62 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 63 64 /* 65 * uio_td is primarily used for USERSPACE transfers, but some devices 66 * like ttys may also use it to get at the process. 67 * 68 * NOTE: uio_resid: Previously used int and FreeBSD decided to use ssize_t, 69 * but after reviewing use cases and in particular the fact that the 70 * iov uses an unsigned quantity, DragonFly will use the (unsigned) 71 * size_t. 72 */ 73 struct uio { 74 struct iovec *uio_iov; 75 int uio_iovcnt; 76 off_t uio_offset; 77 size_t uio_resid; 78 enum uio_seg uio_segflg; 79 enum uio_rw uio_rw; 80 struct thread *uio_td; 81 }; 82 83 /* 84 * Limits 85 */ 86 #define UIO_MAXIOV 1024 /* max 1K of iov's */ 87 #define UIO_SMALLIOV 8 /* 8 on stack, else malloc */ 88 89 #endif 90 91 #if defined(_KERNEL) 92 93 struct vm_object; 94 struct vm_page; 95 96 int uiomove (caddr_t, size_t, struct uio *); 97 int uiomovez (size_t, struct uio *); 98 int uiomove_frombuf (void *buf, size_t buflen, struct uio *uio); 99 int uiomove_fromphys(struct vm_page *ma[], vm_offset_t offset, 100 size_t n, struct uio *uio); 101 int uioread (int, struct uio *, struct vm_object *, int *); 102 int iovec_copyin(struct iovec *, struct iovec **, struct iovec *, 103 size_t, size_t *); 104 105 /* 106 * MPSAFE 107 */ 108 static __inline void 109 iovec_free(struct iovec **kiov, struct iovec *siov) 110 { 111 if (*kiov != siov) { 112 FREE(*kiov, M_IOV); 113 *kiov = NULL; 114 } 115 } 116 117 #else /* !_KERNEL */ 118 119 #include <sys/cdefs.h> 120 121 __BEGIN_DECLS 122 ssize_t readv(int, const struct iovec *, int); 123 ssize_t writev(int, const struct iovec *, int); 124 ssize_t preadv(int, const struct iovec *, int, off_t); 125 ssize_t pwritev(int, const struct iovec *, int, off_t); 126 __END_DECLS 127 128 #endif /* _KERNEL */ 129 130 #endif /* !_SYS_UIO_H_ */ 131