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