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/cdefs.h> 37 #include <sys/_iovec.h> 38 #if __BSD_VISIBLE 39 #include <sys/param.h> 40 #endif 41 #if defined(_KERNEL) 42 #include <sys/malloc.h> /* Needed to inline iovec_free(). */ 43 #endif 44 45 #ifndef _SSIZE_T_DECLARED 46 typedef __ssize_t ssize_t; 47 #define _SSIZE_T_DECLARED 48 #endif 49 50 #if __BSD_VISIBLE 51 enum uio_rw { UIO_READ, UIO_WRITE }; 52 53 /* Segment flag values. */ 54 enum uio_seg { 55 UIO_USERSPACE, /* from user data space */ 56 UIO_SYSSPACE, /* from system space */ 57 UIO_NOCOPY /* don't copy, already in object */ 58 }; 59 #endif 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 buf; 73 74 struct uio { 75 struct iovec *uio_iov; 76 int uio_iovcnt; 77 off_t uio_offset; 78 size_t uio_resid; 79 enum uio_seg uio_segflg; 80 enum uio_rw uio_rw; 81 struct thread *uio_td; 82 }; 83 84 /* 85 * Limits 86 */ 87 #define UIO_MAXIOV 1024 /* max 1K of iov's */ 88 #define UIO_SMALLIOV 8 /* 8 on stack, else malloc */ 89 90 #endif 91 92 #if defined(_KERNEL) 93 94 struct vm_object; 95 struct vm_page; 96 97 int uiomove (caddr_t, size_t, struct uio *); 98 int uiomove_nofault (caddr_t, size_t, struct uio *); 99 int uiomovebp (struct buf *, caddr_t, size_t, struct uio *); 100 int uiomovez (size_t, struct uio *); 101 int uiomove_frombuf (void *buf, size_t buflen, struct uio *uio); 102 int uiomove_fromphys(struct vm_page *ma[], vm_offset_t offset, 103 size_t n, struct uio *uio); 104 int uioread (int, struct uio *, struct vm_object *, int *); 105 int iovec_copyin(struct iovec *, struct iovec **, struct iovec *, 106 size_t, size_t *); 107 108 /* 109 * MPSAFE 110 */ 111 static __inline void 112 iovec_free(struct iovec **kiov, struct iovec *siov) 113 { 114 if (*kiov != siov) { 115 kfree(*kiov, M_IOV); 116 *kiov = NULL; 117 } 118 } 119 120 #else /* !_KERNEL */ 121 122 __BEGIN_DECLS 123 ssize_t readv(int, const struct iovec *, int); 124 ssize_t writev(int, const struct iovec *, int); 125 #if __BSD_VISIBLE 126 ssize_t preadv(int, const struct iovec *, int, off_t); 127 ssize_t pwritev(int, const struct iovec *, int, off_t); 128 #endif 129 __END_DECLS 130 131 #endif /* _KERNEL */ 132 133 #endif /* !_SYS_UIO_H_ */ 134