| | 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 1.7 2003/10/08 20:05:39 dillon 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_USERISPACE, /* from user I space */ |
| | 59 | UIO_NOCOPY /* don't copy, already in object */ |
| | 60 | }; |
| | 61 | |
| | 62 | #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) |
| | 63 | |
| | 64 | /* |
| | 65 | * uio_td is primarily used for USERSPACE transfers, but some devices |
| | 66 | * like ttys may also use it to get at the process. |
| | 67 | */ |
| | 68 | struct uio { |
| | 69 | struct iovec *uio_iov; |
| | 70 | int uio_iovcnt; |
| | 71 | off_t uio_offset; |
| | 72 | int uio_resid; |
| | 73 | enum uio_seg uio_segflg; |
| | 74 | enum uio_rw uio_rw; |
| | 75 | struct thread *uio_td; |
| | 76 | }; |
| | 77 | |
| | 78 | /* |
| | 79 | * Limits |
| | 80 | */ |
| | 81 | #define UIO_MAXIOV 1024 /* max 1K of iov's */ |
| | 82 | #define UIO_SMALLIOV 8 /* 8 on stack, else malloc */ |
| | 83 | |
| | 84 | #endif |
| | 85 | |
| | 86 | #if defined(_KERNEL) |
| | 87 | |
| | 88 | struct vm_object; |
| | 89 | |
| | 90 | void uio_yield (void); |
| | 91 | int uiomove (caddr_t, int, struct uio *); |
| | 92 | int uiomove_frombuf (void *buf, int buflen, struct uio *uio); |
| | 93 | int uiomoveco (caddr_t, int, struct uio *, struct vm_object *); |
| | 94 | int uioread (int, struct uio *, struct vm_object *, int *); |
| | 95 | int iovec_copyin(struct iovec *, struct iovec **, struct iovec *, |
| | 96 | size_t, size_t *); |
| | 97 | |
| | 98 | static __inline void |
| | 99 | iovec_free(struct iovec **kiov, struct iovec *siov) |
| | 100 | { |
| | 101 | if (*kiov != siov) { |
| | 102 | FREE(*kiov, M_IOV); |
| | 103 | *kiov = NULL; |
| | 104 | } |
| | 105 | } |
| | 106 | |
| | 107 | #else /* !_KERNEL */ |
| | 108 | |
| | 109 | #include <sys/cdefs.h> |
| | 110 | |
| | 111 | __BEGIN_DECLS |
| | 112 | ssize_t readv (int, const struct iovec *, int); |
| | 113 | ssize_t writev (int, const struct iovec *, int); |
| | 114 | __END_DECLS |
| | 115 | |
| | 116 | #endif /* _KERNEL */ |
| | 117 | |
| | 118 | #endif /* !_SYS_UIO_H_ */ |
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