1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
/**
* @file
*
* @brief POSIX Asynchronous Input and Output
*
* This file contains the definitions related to POSIX Asynchronous
* Input and Output,
*/
/*
* COPYRIGHT (c) 1989-2011.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#ifndef _AIO_H
#define _AIO_H
#include <sys/cdefs.h>
#include <unistd.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @defgroup POSIX_AIO POSIX Asynchronous I/O Support
*
* @ingroup POSIXAPI
*
* @brief POSIX Asynchronous Input and Output
*
*/
/**@{**/
#if defined(_POSIX_ASYNCHRONOUS_IO)
/*
* 6.7.1 Data Definitions for Asynchronous Input and Output,
* P1003.1b-1993, p. 151
*/
#include <sys/types.h>
#include <signal.h>
#include <time.h>
#include <fcntl.h>
/*
* 6.7.1.2 Manifest Constants, P1003.1b-1993, p. 153
*/
#define AIO_CANCELED 0 /* all requested operations have been canceled */
#define AIO_NOTCANCELED 1 /* some of the operations could not be canceled */
/* since they are in progress */
#define AIO_ALLDONE 2 /* none of the requested operations could be */
/* canceled since they are already complete */
/* lio_listio() options */
/*
* LIO modes
*/
#define LIO_WAIT 0 /* calling process is to suspend until the */
/* operation is complete */
#define LIO_NOWAIT 1 /* calling process is to continue execution while */
/* the operation is performed and no notification */
/* shall be given when the operation is completed */
/*
* LIO opcodes
*/
#define LIO_NOP 0 /* no transfer is requested */
#define LIO_READ 1 /* request a read() */
#define LIO_WRITE 2 /* request a write() */
#define LIO_SYNC 3 /* needed by aio_fsync() */
/*
* 6.7.1.1 Asynchronous I/O Control Block, P1003.1b-1993, p. 151
*/
struct aiocb {
/* public */
int aio_fildes; /* File descriptor */
off_t aio_offset; /* File offset */
volatile void *aio_buf; /* Location of buffer */
size_t aio_nbytes; /* Length of transfer */
int aio_reqprio; /* Request priority offset */
struct sigevent aio_sigevent; /* Signal number and value */
int aio_lio_opcode; /* Operation to be performed */
/* private */
int error_code; /* Used for aio_error() */
ssize_t return_value; /* Used for aio_return() */
};
/*
* 6.7.2 Asynchronous Read, P1003.1b-1993, p. 154
*/
int aio_read(
struct aiocb *aiocbp
);
/*
* 6.7.3 Asynchronous Write, P1003.1b-1993, p. 155
*/
int aio_write(
struct aiocb *aiocbp
);
/*
* 6.7.4 List Directed I/O, P1003.1b-1993, p. 158
*/
int lio_listio(
int mode,
struct aiocb *__restrict const list[__restrict],
int nent,
struct sigevent *__restrict sig
);
/*
* 6.7.5 Retrieve Error of Asynchronous I/O Operation, P1003.1b-1993, p. 161
*/
int aio_error(
const struct aiocb *aiocbp
);
/*
* 6.7.6 Retrieve Return Status of Asynchronous I/O Operation,
* P1003.1b-1993, p. 162
*/
ssize_t aio_return(
const struct aiocb *aiocbp
);
/**
* @brief Cancel asynchronous I/O operation.
*
* 6.7.7 Cancel Asynchronous I/O Operation, P1003.1b-1993, p. 163
*
* @param[in] filedes is the file descriptor
* @param[in] aiocbp is a pointer to the asynchronous I/O control block
*
* @retval AIO_CANCELED The requested operation(s) were canceled.
* @retval AIO_NOTCANCELED Some of the requested operation(s) cannot be
* canceled since they are in progress.
* @retval AIO_ALLDONE None of the requested operation(s) could be canceled
* since they are already complete
*/
int aio_cancel(
int filedes,
struct aiocb *aiocbp
);
/*
* 6.7.7 Wait for Asynchronous I/O Request, P1003.1b-1993, p. 164
*/
int aio_suspend(
const struct aiocb * const list[],
int nent,
const struct timespec *timeout
);
#if defined(_POSIX_SYNCHRONIZED_IO)
/*
* 6.7.9 Asynchronous File Synchronization, P1003.1b-1993, p. 166
*/
int aio_fsync(
int op,
struct aiocb *aiocbp
);
#endif /* _POSIX_SYNCHRONIZED_IO */
#endif /* _POSIX_ASYNCHRONOUS_IO */
/** @} */
#ifdef __cplusplus
}
#endif
#endif
/* end of include file */
|
