1 .\" Copyright (c) 2013 Sergey Kandaurov
2 .\" All rights reserved.
4 .\" Redistribution and use in source and binary forms, with or without
5 .\" modification, are permitted provided that the following conditions
7 .\" 1. Redistributions of source code must retain the above copyright
8 .\" notice, this list of conditions and the following disclaimer.
9 .\" 2. Redistributions in binary form must reproduce the above copyright
10 .\" notice, this list of conditions and the following disclaimer in the
11 .\" documentation and/or other materials provided with the distribution.
13 .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 .Nd asynchronous file synchronization (REALTIME)
38 .Fn aio_fsync "int op" "struct aiocb *iocb"
42 system call allows the calling process to move all modified data
43 associated with the descriptor
45 to a permanent storage device.
46 The call returns immediately after the synchronization request has been
47 enqueued to the descriptor; the synchronization may or may not have
48 completed at the time the call returns.
52 argument can only be set to
54 to cause all currently queued I/O operations to be completed
58 If _POSIX_PRIORITIZED_IO is defined, and the descriptor supports it,
59 then the enqueued operation is submitted at a priority equal to that
60 of the calling process minus
61 .Fa iocb->aio_reqprio .
65 pointer may be subsequently used as an argument to
69 in order to determine return or error status for the enqueued operation
70 while it is in progress.
72 If the request could not be enqueued (generally due to invalid arguments),
73 the call returns without having enqueued the request.
79 system call will fail if:
82 The request was not queued because of system resource limitations.
86 system call is not supported.
90 argument is not set to
94 The following conditions may be synchronously detected when the
96 system call is made, or asynchronously, at any time thereafter.
97 If they are detected at call time,
101 appropriately; otherwise the
103 system call must be called, and will return -1, and
105 must be called to determine the actual value that would have been
113 is not a valid descriptor.
115 This implementation does not support synchronized I/O for this file.
118 If the request is successfully enqueued, but subsequently cancelled
119 or an error occurs, the value returned by the
121 system call is per the
125 system calls, and the value returned by the
127 system call is one of the error returns from the
138 .Xr aio_waitcomplete 2 ,
146 system call is expected to conform to the
152 system call first appeared in