mirror of
https://github.com/freebsd/freebsd-src
synced 2024-09-06 17:18:32 +00:00
153 lines
4.2 KiB
Groff
153 lines
4.2 KiB
Groff
![]() |
.\" Copyright (c) 2013 Sergey Kandaurov
|
||
|
.\" All rights reserved.
|
||
|
.\"
|
||
|
.\" Redistribution and use in source and binary forms, with or without
|
||
|
.\" modification, are permitted provided that the following conditions
|
||
|
.\" are met:
|
||
|
.\" 1. Redistributions of source code must retain the above copyright
|
||
|
.\" notice, this list of conditions and the following disclaimer.
|
||
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
||
|
.\" notice, this list of conditions and the following disclaimer in the
|
||
|
.\" documentation and/or other materials provided with the distribution.
|
||
|
.\"
|
||
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
||
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
||
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||
|
.\" SUCH DAMAGE.
|
||
|
.\"
|
||
|
.\" $FreeBSD$
|
||
|
.\"
|
||
|
.Dd May 4, 2013
|
||
|
.Dt AIO_FSYNC 2
|
||
|
.Os
|
||
|
.Sh NAME
|
||
|
.Nm aio_fsync
|
||
|
.Nd asynchronous file synchronization (REALTIME)
|
||
|
.Sh LIBRARY
|
||
|
.Lb libc
|
||
|
.Sh SYNOPSIS
|
||
|
.In aio.h
|
||
|
.Ft int
|
||
|
.Fn aio_fsync "int op" "struct aiocb *iocb"
|
||
|
.Sh DESCRIPTION
|
||
|
The
|
||
|
.Fn aio_fsync
|
||
|
system call allows the calling process to move all modified data
|
||
|
associated with the descriptor
|
||
|
.Fa iocb->aio_fildes
|
||
|
to a permanent storage device.
|
||
|
The call returns immediately after the synchronization request has been
|
||
|
enqueued to the descriptor; the synchronization may or may not have
|
||
|
completed at the time the call returns.
|
||
|
.Pp
|
||
|
The
|
||
|
.Fa op
|
||
|
argument could be set only to
|
||
|
.Dv O_SYNC
|
||
|
to cause all currently queued I/O operations to be completed
|
||
|
as if by a call to
|
||
|
.Xr fsync 2 .
|
||
|
.Pp
|
||
|
If _POSIX_PRIORITIZED_IO is defined, and the descriptor supports it,
|
||
|
then the enqueued operation is submitted at a priority equal to that
|
||
|
of the calling process minus
|
||
|
.Fa iocb->aio_reqprio .
|
||
|
.Pp
|
||
|
The
|
||
|
.Fa iocb
|
||
|
pointer may be subsequently used as an argument to
|
||
|
.Fn aio_return
|
||
|
and
|
||
|
.Fn aio_error
|
||
|
in order to determine return or error status for the enqueued operation
|
||
|
while it is in progress.
|
||
|
.Pp
|
||
|
If the request could not be enqueued (generally due to invalid arguments),
|
||
|
the call returns without having enqueued the request.
|
||
|
.Sh RETURN VALUES
|
||
|
.Rv -std aio_fsync
|
||
|
.Sh ERRORS
|
||
|
The
|
||
|
.Fn aio_fsync
|
||
|
system call will fail if:
|
||
|
.Bl -tag -width Er
|
||
|
.It Bq Er EAGAIN
|
||
|
The request was not queued because of system resource limitations.
|
||
|
.It Bq Er ENOSYS
|
||
|
The
|
||
|
.Fn aio_fsync
|
||
|
system call is not supported.
|
||
|
.It Bq Er EINVAL
|
||
|
A value of the
|
||
|
.Fa op
|
||
|
argument is not set to
|
||
|
.Dv O_SYNC .
|
||
|
.El
|
||
|
.Pp
|
||
|
The following conditions may be synchronously detected when the
|
||
|
.Fn aio_fsync
|
||
|
system call is made, or asynchronously, at any time thereafter.
|
||
|
If they are detected at call time,
|
||
|
.Fn aio_fsync
|
||
|
returns -1 and sets
|
||
|
.Va errno
|
||
|
appropriately; otherwise the
|
||
|
.Fn aio_return
|
||
|
system call must be called, and will return -1, and
|
||
|
.Fn aio_error
|
||
|
must be called to determine the actual value that would have been
|
||
|
returned in
|
||
|
.Va errno .
|
||
|
.Bl -tag -width Er
|
||
|
.It Bq Er EBADF
|
||
|
The
|
||
|
.Fa iocb->aio_fildes
|
||
|
is invalid for writing.
|
||
|
.It Bq Er EINVAL
|
||
|
This implementation does not support synchronized I/O for this file.
|
||
|
.El
|
||
|
.Pp
|
||
|
If the request is successfully enqueued, but subsequently cancelled
|
||
|
or an error occurs, the value returned by the
|
||
|
.Fn aio_return
|
||
|
system call is per the
|
||
|
.Xr read 2
|
||
|
and
|
||
|
.Xr write 2
|
||
|
system calls, and the value returned by the
|
||
|
.Fn aio_error
|
||
|
system call is one of the error returns from the
|
||
|
.Xr read 2
|
||
|
or
|
||
|
.Xr write 2
|
||
|
system calls.
|
||
|
.Sh SEE ALSO
|
||
|
.Xr aio_cancel 2 ,
|
||
|
.Xr aio_error 2 ,
|
||
|
.Xr aio_read 2 ,
|
||
|
.Xr aio_return 2 ,
|
||
|
.Xr aio_suspend 2 ,
|
||
|
.Xr aio_waitcomplete 2 ,
|
||
|
.Xr aio_write 2 ,
|
||
|
.Xr fsync 2 ,
|
||
|
.Xr siginfo 3 ,
|
||
|
.Xr aio 4
|
||
|
.Sh STANDARDS
|
||
|
The
|
||
|
.Fn aio_fsync
|
||
|
system call is expected to conform to the
|
||
|
.St -p1003.1
|
||
|
standard.
|
||
|
.Sh HISTORY
|
||
|
The
|
||
|
.Fn aio_fsync
|
||
|
system call first appeared in
|
||
|
.Fx 7.0 .
|