| 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 1.6 2003/10/08 01:30:32 daver 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 | #ifdef _KERNEL |
| 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 | struct vm_object; |
| 85 | |
| 86 | void uio_yield (void); |
| 87 | int uiomove (caddr_t, int, struct uio *); |
| 88 | int uiomove_frombuf (void *buf, int buflen, struct uio *uio); |
| 89 | int uiomoveco (caddr_t, int, struct uio *, struct vm_object *); |
| 90 | int uioread (int, struct uio *, struct vm_object *, int *); |
| 91 | int iovec_copyin(struct iovec *, struct iovec **, struct iovec *, |
| 92 | size_t, size_t *); |
| 93 | |
| 94 | static __inline void |
| 95 | iovec_free(struct iovec **kiov, struct iovec *siov) |
| 96 | { |
| 97 | if (*kiov != siov) { |
| 98 | FREE(*kiov, M_IOV); |
| 99 | *kiov = NULL; |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | #else /* !_KERNEL */ |
| 104 | |
| 105 | #include <sys/cdefs.h> |
| 106 | |
| 107 | __BEGIN_DECLS |
| 108 | ssize_t readv (int, const struct iovec *, int); |
| 109 | ssize_t writev (int, const struct iovec *, int); |
| 110 | __END_DECLS |
| 111 | |
| 112 | #endif /* _KERNEL */ |
| 113 | |
| 114 | #endif /* !_SYS_UIO_H_ */ |