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 #ifndef _SYS_TYPES_H_ 42 #include <sys/types.h> 43 #endif 44 #ifndef _SYS_PARAM_H_ 45 #include <sys/param.h> 46 #endif 47 #ifndef _SYS_MALLOC_H_ 48 #include <sys/malloc.h> /* Needed to inline iovec_free(). */ 49 #endif 50 51 /* 52 * XXX 53 * iov_base should be a void *. 54 */ 55 struct iovec { 56 char *iov_base; /* Base address. */ 57 size_t iov_len; /* Length. */ 58 }; 59 60 enum uio_rw { UIO_READ, UIO_WRITE }; 61 62 /* Segment flag values. */ 63 enum uio_seg { 64 UIO_USERSPACE, /* from user data space */ 65 UIO_SYSSPACE, /* from system space */ 66 UIO_NOCOPY /* don't copy, already in object */ 67 }; 68 69 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 70 71 /* 72 * uio_td is primarily used for USERSPACE transfers, but some devices 73 * like ttys may also use it to get at the process. 74 */ 75 struct uio { 76 struct iovec *uio_iov; 77 int uio_iovcnt; 78 off_t uio_offset; 79 int uio_resid; 80 enum uio_seg uio_segflg; 81 enum uio_rw uio_rw; 82 struct thread *uio_td; 83 }; 84 85 /* 86 * Limits 87 */ 88 #define UIO_MAXIOV 1024 /* max 1K of iov's */ 89 #define UIO_SMALLIOV 8 /* 8 on stack, else malloc */ 90 91 #endif 92 93 #if defined(_KERNEL) 94 95 struct vm_object; 96 struct vm_page; 97 98 void uio_yield (void); 99 int uiomove (caddr_t, int, struct uio *); 100 int uiomove_frombuf (void *buf, int buflen, struct uio *uio); 101 int uiomove_fromphys(struct vm_page *ma[], vm_offset_t offset, int n, 102 struct uio *uio); 103 int uiomoveco (caddr_t, int, struct uio *, struct vm_object *); 104 int uioread (int, struct uio *, struct vm_object *, int *); 105 int iovec_copyin(struct iovec *, struct iovec **, struct iovec *, 106 size_t, int *); 107 108 /* 109 * MPSAFE 110 */ 111 static __inline void 112 iovec_free(struct iovec **kiov, struct iovec *siov) 113 { 114 if (*kiov != siov) { 115 FREE(*kiov, M_IOV); 116 *kiov = NULL; 117 } 118 } 119 120 #else /* !_KERNEL */ 121 122 #include <sys/cdefs.h> 123 124 __BEGIN_DECLS 125 ssize_t readv(int, const struct iovec *, int); 126 ssize_t writev(int, const struct iovec *, int); 127 ssize_t preadv(int, const struct iovec *, int, off_t); 128 ssize_t pwritev(int, const struct iovec *, int, off_t); 129 __END_DECLS 130 131 #endif /* _KERNEL */ 132 133 #endif /* !_SYS_UIO_H_ */ 134