1 /* $NetBSD: uio.h,v 1.13 2025/07/24 09:04:56 hans Exp $ */ 2 3 /*- 4 * Copyright (c) 2009 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Andrew Doran. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /*- 33 * Copyright (c) 2007 Pawel Jakub Dawidek <pjd (at) FreeBSD.org> 34 * All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 45 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 48 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 55 * SUCH DAMAGE. 56 * 57 * $FreeBSD: head/sys/cddl/compat/opensolaris/sys/uio.h 219089 2011-02-27 19:41:40Z pjd $ 58 */ 59 60 #ifndef _OPENSOLARIS_SYS_UIO_H_ 61 #define _OPENSOLARIS_SYS_UIO_H_ 62 63 #include_next <sys/uio.h> 64 65 #ifndef __sun 66 #include <sys/debug.h> 67 68 #ifndef _KERNEL 69 #include <assert.h> 70 #include <string.h> 71 72 #define FOF_OFFSET 1 /* Use the offset in uio argument */ 73 74 struct uio { 75 struct iovec *uio_iov; 76 int uio_iovcnt; 77 off_t uio_offset; 78 int uio_resid; 79 enum uio_seg uio_segflg; 80 enum uio_rw uio_rw; 81 void *uio_td; 82 }; 83 #endif 84 85 struct xuio { 86 struct uio xu_uio; 87 int xuio_rw; 88 void *xuio_priv; 89 }; 90 91 #define XUIO_XUZC_PRIV(xuio) ((xuio)->xuio_priv) 92 #define XUIO_XUZC_RW(xuio) ((xuio)->xuio_rw) 93 94 typedef struct uio uio_t; 95 typedef struct xuio xuio_t; 96 typedef struct iovec iovec_t; 97 98 typedef enum uio_seg uio_seg_t; 99 100 #define uio_loffset uio_offset 101 102 int uiomove(void *, size_t, struct uio *); 103 104 static __inline int 105 zfs_uiomove(void *cp, size_t n, enum uio_rw dir, uio_t *uio) 106 { 107 108 assert(uio->uio_rw == dir); 109 return (uiomove(cp, n, uio)); 110 } 111 112 #define ZFS_MIN(a,b) ((/*CONSTCOND*/(a)<(b))?(a):(b)) 113 114 static __inline int 115 zfs_uiocopy(void *cp, size_t n, enum uio_rw dir, uio_t *uio, size_t *cbytes) 116 { 117 uio_t auio; 118 struct iovec aiov; 119 size_t cnt; 120 int i, error; 121 122 *cbytes = 0; 123 memcpy(&auio, uio, sizeof(*uio)); 124 for (i = 0; i < uio->uio_iovcnt && n > 0; i++) { 125 auio.uio_iov = &aiov; 126 auio.uio_iovcnt = 1; 127 aiov = uio->uio_iov[i]; 128 cnt = ZFS_MIN(aiov.iov_len, n); 129 if (cnt == 0) 130 continue; 131 error = uiomove(cp, cnt, &auio); 132 if (error) 133 return error; 134 cp = (char *)cp + cnt; 135 n -= cnt; 136 *cbytes += cnt; 137 } 138 139 return 0; 140 } 141 142 static __inline void 143 zfs_uioskip(uio_t *uiop, size_t n) 144 { 145 if (n > (size_t)uiop->uio_resid) 146 return; 147 while (n != 0) { 148 iovec_t *iovp = uiop->uio_iov; 149 size_t niovb = ZFS_MIN(iovp->iov_len, n); 150 151 if (niovb == 0) { 152 uiop->uio_iov++; 153 uiop->uio_iovcnt--; 154 continue; 155 } 156 iovp->iov_base = (char *)iovp->iov_base + niovb; 157 uiop->uio_offset += (off_t)niovb; 158 iovp->iov_len -= niovb; 159 uiop->uio_resid -= (int)niovb; 160 n -= niovb; 161 } 162 163 } 164 165 #define uiomove(cp, n, dir, uio) zfs_uiomove((cp), (n), (dir), (uio)) 166 #define uiocopy(cp, n, dir, uio, cbytes) zfs_uiocopy((cp), (n), (dir), (uio), (cbytes)) 167 #define uioskip(uio, size) zfs_uioskip((uio), (size)) 168 169 #endif /* __sun */ 170 171 #endif /* !_OPENSOLARIS_SYS_UIO_H_ */ 172
Indexes created Fri Jun 12 00:25:51 UTC 2026