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 1.9 2004/07/27 13:11:22 hmp Exp $ 36 */ 37 38 #ifndef _SYS_UIO_H_ 39 #define _SYS_UIO_H_ 40 41 #include <sys/malloc.h> /* Needed to inline iovec_free(). */ 42 43 /* 44 * XXX 45 * iov_base should be a void *. 46 */ 47 struct iovec { 48 char *iov_base; /* Base address. */ 49 size_t iov_len; /* Length. */ 50 }; 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 struct uio { 68 struct iovec *uio_iov; 69 int uio_iovcnt; 70 off_t uio_offset; 71 int uio_resid; 72 enum uio_seg uio_segflg; 73 enum uio_rw uio_rw; 74 struct thread *uio_td; 75 }; 76 77 /* 78 * Limits 79 */ 80 #define UIO_MAXIOV 1024 /* max 1K of iov's */ 81 #define UIO_SMALLIOV 8 /* 8 on stack, else malloc */ 82 83 #endif 84 85 #if defined(_KERNEL) 86 87 struct vm_object; 88 89 void uio_yield (void); 90 int uiomove (caddr_t, int, struct uio *); 91 int uiomove_frombuf (void *buf, int buflen, struct uio *uio); 92 int uiomove_fromphys(struct vm_page *ma[], vm_offset_t offset, int n, 93 struct uio *uio); 94 int uiomoveco (caddr_t, int, struct uio *, struct vm_object *); 95 int uioread (int, struct uio *, struct vm_object *, int *); 96 int iovec_copyin(struct iovec *, struct iovec **, struct iovec *, 97 size_t, size_t *); 98 99 static __inline void 100 iovec_free(struct iovec **kiov, struct iovec *siov) 101 { 102 if (*kiov != siov) { 103 FREE(*kiov, M_IOV); 104 *kiov = NULL; 105 } 106 } 107 108 #else /* !_KERNEL */ 109 110 #include <sys/cdefs.h> 111 112 __BEGIN_DECLS 113 ssize_t readv (int, const struct iovec *, int); 114 ssize_t writev (int, const struct iovec *, int); 115 __END_DECLS 116 117 #endif /* _KERNEL */ 118 119 #endif /* !_SYS_UIO_H_ */ 120