FreeBSD/Linux Kernel Cross Reference
sys/sys/aio.h
1 /*-
2 * Copyright (c) 1997 John S. Dyson. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. John S. Dyson's name may not be used to endorse or promote products
10 * derived from this software without specific prior written permission.
11 *
12 * DISCLAIMER: This code isn't warranted to do anything useful. Anything
13 * bad that happens because of using this software isn't the responsibility
14 * of the author. This software is distributed AS-IS.
15 *
16 * $FreeBSD: releng/9.1/sys/sys/aio.h 189822 2009-03-14 19:17:00Z das $
17 */
18
19 #ifndef _SYS_AIO_H_
20 #define _SYS_AIO_H_
21
22 #include <sys/types.h>
23 #include <sys/signal.h>
24
25 /*
26 * Returned by aio_cancel:
27 */
28 #define AIO_CANCELED 0x1
29 #define AIO_NOTCANCELED 0x2
30 #define AIO_ALLDONE 0x3
31
32 /*
33 * LIO opcodes
34 */
35 #define LIO_NOP 0x0
36 #define LIO_WRITE 0x1
37 #define LIO_READ 0x2
38 #ifdef _KERNEL
39 #define LIO_SYNC 0x3
40 #endif
41
42 /*
43 * LIO modes
44 */
45 #define LIO_NOWAIT 0x0
46 #define LIO_WAIT 0x1
47
48 /*
49 * Maximum number of allowed LIO operations
50 */
51 #define AIO_LISTIO_MAX 16
52
53 /*
54 * Private members for aiocb -- don't access
55 * directly.
56 */
57 struct __aiocb_private {
58 long status;
59 long error;
60 void *kernelinfo;
61 };
62
63 /*
64 * I/O control block
65 */
66 typedef struct aiocb {
67 int aio_fildes; /* File descriptor */
68 off_t aio_offset; /* File offset for I/O */
69 volatile void *aio_buf; /* I/O buffer in process space */
70 size_t aio_nbytes; /* Number of bytes for I/O */
71 int __spare__[2];
72 void *__spare2__;
73 int aio_lio_opcode; /* LIO opcode */
74 int aio_reqprio; /* Request priority -- ignored */
75 struct __aiocb_private _aiocb_private;
76 struct sigevent aio_sigevent; /* Signal to deliver */
77 } aiocb_t;
78
79 #ifndef _KERNEL
80
81 struct timespec;
82
83 __BEGIN_DECLS
84 /*
85 * Asynchronously read from a file
86 */
87 int aio_read(struct aiocb *);
88
89 /*
90 * Asynchronously write to file
91 */
92 int aio_write(struct aiocb *);
93
94 /*
95 * List I/O Asynchronously/synchronously read/write to/from file
96 * "lio_mode" specifies whether or not the I/O is synchronous.
97 * "acb_list" is an array of "nacb_listent" I/O control blocks.
98 * when all I/Os are complete, the optional signal "sig" is sent.
99 */
100 int lio_listio(int, struct aiocb * const [], int, struct sigevent *);
101
102 /*
103 * Get completion status
104 * returns EINPROGRESS until I/O is complete.
105 * this routine does not block.
106 */
107 int aio_error(const struct aiocb *);
108
109 /*
110 * Finish up I/O, releasing I/O resources and returns the value
111 * that would have been associated with a synchronous I/O request.
112 * This routine must be called once and only once for each
113 * I/O control block who has had I/O associated with it.
114 */
115 ssize_t aio_return(struct aiocb *);
116
117 /*
118 * Cancel I/O
119 */
120 int aio_cancel(int, struct aiocb *);
121
122 /*
123 * Suspend until all specified I/O or timeout is complete.
124 */
125 int aio_suspend(const struct aiocb * const[], int, const struct timespec *);
126
127 #ifdef __BSD_VISIBLE
128 int aio_waitcomplete(struct aiocb **, struct timespec *);
129 #endif
130
131 int aio_fsync(int op, struct aiocb *aiocbp);
132 __END_DECLS
133
134 #else
135
136 /* Forward declarations for prototypes below. */
137 struct socket;
138 struct sockbuf;
139
140 extern void (*aio_swake)(struct socket *, struct sockbuf *);
141
142 #endif
143
144 #endif
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