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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)uio.h 8.5 (Berkeley) 2/22/94 30 * $FreeBSD: src/sys/sys/uio.h,v 1.11.2.1 2001/09/28 16:58:35 dillon Exp $ 31 */ 32 33 #ifndef _SYS_UIO_H_ 34 #define _SYS_UIO_H_ 35 36 #include <sys/_iovec.h> 37 38 #ifndef _SYS_TYPES_H_ 39 #include <sys/types.h> 40 #endif 41 #ifndef _SYS_PARAM_H_ 42 #include <sys/param.h> 43 #endif 44 #ifndef _SYS_MALLOC_H_ 45 #include <sys/malloc.h> /* Needed to inline iovec_free(). */ 46 #endif 47 48 enum uio_rw { UIO_READ, UIO_WRITE }; 49 50 /* Segment flag values. */ 51 enum uio_seg { 52 UIO_USERSPACE, /* from user data space */ 53 UIO_SYSSPACE, /* from system space */ 54 UIO_NOCOPY /* don't copy, already in object */ 55 }; 56 57 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 58 59 /* 60 * uio_td is primarily used for USERSPACE transfers, but some devices 61 * like ttys may also use it to get at the process. 62 * 63 * NOTE: uio_resid: Previously used int and FreeBSD decided to use ssize_t, 64 * but after reviewing use cases and in particular the fact that the 65 * iov uses an unsigned quantity, DragonFly will use the (unsigned) 66 * size_t. 67 */ 68 struct buf; 69 70 struct uio { 71 struct iovec *uio_iov; 72 int uio_iovcnt; 73 off_t uio_offset; 74 size_t uio_resid; 75 enum uio_seg uio_segflg; 76 enum uio_rw uio_rw; 77 struct thread *uio_td; 78 }; 79 80 /* 81 * Limits 82 */ 83 #define UIO_MAXIOV 1024 /* max 1K of iov's */ 84 #define UIO_SMALLIOV 8 /* 8 on stack, else malloc */ 85 86 #endif 87 88 #if defined(_KERNEL) 89 90 struct vm_object; 91 struct vm_page; 92 93 int uiomove (caddr_t, size_t, struct uio *); 94 int uiomove_nofault (caddr_t, size_t, struct uio *); 95 int uiomovebp (struct buf *, 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