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984263bc MD |
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 | */ | |
36 | ||
37 | #ifndef _SYS_UIO_H_ | |
38 | #define _SYS_UIO_H_ | |
39 | ||
c8b3626a SW |
40 | #include <sys/_iovec.h> |
41 | ||
1bd40720 MD |
42 | #ifndef _SYS_TYPES_H_ |
43 | #include <sys/types.h> | |
44 | #endif | |
45 | #ifndef _SYS_PARAM_H_ | |
46 | #include <sys/param.h> | |
47 | #endif | |
48 | #ifndef _SYS_MALLOC_H_ | |
75a872f8 | 49 | #include <sys/malloc.h> /* Needed to inline iovec_free(). */ |
1bd40720 | 50 | #endif |
75a872f8 | 51 | |
984263bc MD |
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 */ | |
984263bc MD |
58 | UIO_NOCOPY /* don't copy, already in object */ |
59 | }; | |
60 | ||
aa447efa | 61 | #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) |
984263bc | 62 | |
dadab5e9 MD |
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. | |
e54488bb MD |
66 | * |
67 | * NOTE: uio_resid: Previously used int and FreeBSD decided to use ssize_t, | |
68 | * but after reviewing use cases and in particular the fact that the | |
69 | * iov uses an unsigned quantity, DragonFly will use the (unsigned) | |
70 | * size_t. | |
dadab5e9 | 71 | */ |
68cdd773 MD |
72 | struct buf; |
73 | ||
984263bc MD |
74 | struct uio { |
75 | struct iovec *uio_iov; | |
76 | int uio_iovcnt; | |
77 | off_t uio_offset; | |
e54488bb | 78 | size_t uio_resid; |
984263bc MD |
79 | enum uio_seg uio_segflg; |
80 | enum uio_rw uio_rw; | |
dadab5e9 | 81 | struct thread *uio_td; |
984263bc MD |
82 | }; |
83 | ||
84 | /* | |
85 | * Limits | |
86 | */ | |
87 | #define UIO_MAXIOV 1024 /* max 1K of iov's */ | |
88 | #define UIO_SMALLIOV 8 /* 8 on stack, else malloc */ | |
89 | ||
aa447efa MD |
90 | #endif |
91 | ||
92 | #if defined(_KERNEL) | |
93 | ||
984263bc | 94 | struct vm_object; |
03d6a592 | 95 | struct vm_page; |
984263bc | 96 | |
e54488bb | 97 | int uiomove (caddr_t, size_t, struct uio *); |
68cdd773 | 98 | int uiomovebp (struct buf *, caddr_t, size_t, struct uio *); |
c7841cbe | 99 | int uiomovez (size_t, struct uio *); |
e54488bb MD |
100 | int uiomove_frombuf (void *buf, size_t buflen, struct uio *uio); |
101 | int uiomove_fromphys(struct vm_page *ma[], vm_offset_t offset, | |
102 | size_t n, struct uio *uio); | |
b153f746 | 103 | int uioread (int, struct uio *, struct vm_object *, int *); |
75a872f8 | 104 | int iovec_copyin(struct iovec *, struct iovec **, struct iovec *, |
e54488bb | 105 | size_t, size_t *); |
75a872f8 | 106 | |
f832287e MD |
107 | /* |
108 | * MPSAFE | |
109 | */ | |
75a872f8 DRJ |
110 | static __inline void |
111 | iovec_free(struct iovec **kiov, struct iovec *siov) | |
112 | { | |
113 | if (*kiov != siov) { | |
884717e1 | 114 | kfree(*kiov, M_IOV); |
75a872f8 DRJ |
115 | *kiov = NULL; |
116 | } | |
117 | } | |
984263bc MD |
118 | |
119 | #else /* !_KERNEL */ | |
120 | ||
121 | #include <sys/cdefs.h> | |
122 | ||
123 | __BEGIN_DECLS | |
7f83ed38 MD |
124 | ssize_t readv(int, const struct iovec *, int); |
125 | ssize_t writev(int, const struct iovec *, int); | |
126 | ssize_t preadv(int, const struct iovec *, int, off_t); | |
127 | ssize_t pwritev(int, const struct iovec *, int, off_t); | |
984263bc MD |
128 | __END_DECLS |
129 | ||
130 | #endif /* _KERNEL */ | |
131 | ||
132 | #endif /* !_SYS_UIO_H_ */ |