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
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
|
/* Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
/*
* ISO/IEC 9945-1:1996 6.7: Asynchronous Input and Output
*/
#ifndef _AIO_H
#define _AIO_H 1
#include <features.h>
#include <fcntl.h>
#include <signal.h>
#include <time.h>
#include <sys/types.h>
__BEGIN_DECLS
/* Asynchronous I/O control block. */
struct aiocb
{
int aio_fildes; /* File desriptor. */
int aio_lio_opcode; /* Operation to be performed. */
int aio_reqprio; /* Request priority offset. */
volatile void *aio_buf; /* Location of buffer. */
size_t aio_nbytes; /* Length of transfer. */
struct sigevent aio_sigevent; /* Signal number and value. */
/* Internal members. */
struct aiocb *__next_prio;
int __abs_prio;
int __policy;
int __error_code;
__ssize_t __return_value;
#ifndef __USE_FILE_OFFSET64
__off_t aio_offset; /* File offset. */
char __pad[sizeof (__off64_t) - sizeof (__off_t)];
#else
__off64_t aio_offset; /* File offset. */
#endif
char __unused[32];
};
/* The same for the 64bit offsets. Please note that the members aio_fildes
to __return_value have to be the same in aiocb and aiocb64. */
#ifdef __USE_LARGEFILE64
struct aiocb64
{
int aio_fildes; /* File desriptor. */
int aio_lio_opcode; /* Operation to be performed. */
int aio_reqprio; /* Request priority offset. */
volatile void *aio_buf; /* Location of buffer. */
size_t aio_nbytes; /* Length of transfer. */
struct sigevent aio_sigevent; /* Signal number and value. */
/* Internal members. */
struct aiocb *__next_prio;
int __abs_prio;
int __policy;
int __error_code;
__ssize_t __return_value;
__off64_t aio_offset; /* File offset. */
char __unused[32];
};
#endif
#ifdef __USE_GNU
/* To customize the implementation one can use the following struct.
This implementation follows the one in Irix. */
struct aioinit
{
int aio_threads; /* Maximal number of threads. */
int aio_num; /* Number of expected simultanious requests. */
int aio_locks; /* Not used. */
int aio_usedba; /* Not used. */
int aio_debug; /* Not used. */
int aio_numusers; /* Not used. */
int aio_idle_time; /* Number of seconds before idle thread
terminates. */
int aio_reserved;
};
#endif
/* Return values of cancelation function. */
enum
{
AIO_CANCELED,
#define AIO_CANCELED AIO_CANCELED
AIO_NOTCANCELED,
#define AIO_NOTCANCELED AIO_NOTCANCELED
AIO_ALLDONE
#define AIO_ALLDONE AIO_ALLDONE
};
/* Operation codes for `aio_lio_opcode'. */
enum
{
LIO_READ,
#define LIO_READ LIO_READ
LIO_WRITE,
#define LIO_WRITE LIO_WRITE
LIO_NOP
#define LIO_NOP LIO_NOP
};
/* Synchronization options for `lio_listio' function. */
enum
{
LIO_WAIT,
#define LIO_WAIT LIO_WAIT
LIO_NOWAIT
#define LIO_NOWAIT LIO_NOWAIT
};
/* Allow user to specify optimization. */
#ifdef __USE_GNU
extern void aio_init (__const struct aioinit *__init) __THROW;
#endif
#ifndef __USE_FILE_OFFSET64
/* Enqueue read request for given number of bytes and the given priority. */
extern int aio_read (struct aiocb *__aiocbp) __THROW;
/* Enqueue write request for given number of bytes and the given priority. */
extern int aio_write (struct aiocb *__aiocbp) __THROW;
/* Initiate list of I/O requests. */
extern int lio_listio (int __mode,
struct aiocb *__const __list[__restrict_arr],
int __nent, struct sigevent *__restrict __sig) __THROW;
/* Retrieve error status associated with AIOCBP. */
extern int aio_error (__const struct aiocb *__aiocbp) __THROW;
/* Return status associated with AIOCBP. */
extern __ssize_t aio_return (struct aiocb *__aiocbp) __THROW;
/* Try to cancel asynchronous I/O requests outstanding against file
descriptor FILDES. */
extern int aio_cancel (int __fildes, struct aiocb *__aiocbp) __THROW;
/* Suspend calling thread until at least one of the asynchronous I/O
operations referenced by LIST has completed. */
extern int aio_suspend (__const struct aiocb *__const __list[], int __nent,
__const struct timespec *__restrict __timeout) __THROW;
/* Force all operations associated with file desriptor described by
`aio_fildes' member of AIOCBP. */
extern int aio_fsync (int __operation, struct aiocb *__aiocbp) __THROW;
#else
# ifdef __REDIRECT
extern int __REDIRECT (aio_read, (struct aiocb *__aiocbp) __THROW, aio_read64);
extern int __REDIRECT (aio_write, (struct aiocb *__aiocbp) __THROW,
aio_write64);
extern int __REDIRECT (lio_listio,
(int __mode,
struct aiocb *__const __list[__restrict_arr],
int __nent, struct sigevent *__restrict __sig) __THROW,
lio_listio64);
extern int __REDIRECT (aio_error, (__const struct aiocb *__aiocbp) __THROW,
aio_error64);
extern __ssize_t __REDIRECT (aio_return, (struct aiocb *__aiocbp) __THROW,
aio_return64);
extern int __REDIRECT (aio_cancel,
(int __fildes, struct aiocb *__aiocbp) __THROW,
aio_cancel64);
extern int __REDIRECT (aio_suspend,
(__const struct aiocb *__const __list[],
int __nent,
__const struct timespec *__restrict __timeout) __THROW,
aio_suspend64);
extern int __REDIRECT (aio_fsync,
(int __operation, struct aiocb *__aiocbp) __THROW,
aio_fsync64);
# else
# define aio_read aio_read64
# define aio_write aio_write64
# define lio_listio lio_listio64
# define aio_error aio_error64
# define aio_return aio_return64
# define aio_cancel aio_cancel64
# define aio_suspend aio_suspend64
# define aio_fsync aio_fsync64
# endif
#endif
#ifdef __USE_LARGEFILE64
extern int aio_read64 (struct aiocb64 *__aiocbp) __THROW;
extern int aio_write64 (struct aiocb64 *__aiocbp) __THROW;
extern int lio_listio64 (int __mode,
struct aiocb64 *__const __list[__restrict_arr],
int __nent, struct sigevent *__restrict __sig)
__THROW;
extern int aio_error64 (__const struct aiocb64 *__aiocbp) __THROW;
extern __ssize_t aio_return64 (struct aiocb64 *__aiocbp) __THROW;
extern int aio_cancel64 (int __fildes, struct aiocb64 *__aiocbp) __THROW;
extern int aio_suspend64 (__const struct aiocb64 *__const __list[], int __nent,
__const struct timespec *__restrict __timeout)
__THROW;
extern int aio_fsync64 (int __operation, struct aiocb64 *__aiocbp) __THROW;
#endif
__END_DECLS
#endif /* aio.h */
|
