.\" Copyright (c) 2003 Andries Brouwer (aeb@cwi.nl)
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.TH AIO_FSYNC 3 2003-11-14  "" "Linux Programmer's Manual"
.SH NAME
aio_fsync \- asynchronous file synchronization
.SH SYNOPSIS
.B "#include <aio.h>"
.sp
.BI "int aio_fsync(int " op ", struct aiocb *" aiocbp );
.sp
Link with \fI\-lrt\fP.
.SH DESCRIPTION
The
.BR aio_fsync ()
function does a sync on all outstanding asynchronous I/O operations
associated with
.IR aiocbp\->aio_fildes .
.LP
More precisely, if
.I op
is
.BR O_SYNC ,
then all currently queued I/O operations shall be
completed as if by a call of
.BR fsync (2),
and if
.I op
is
.BR O_DSYNC ,
this call is the asynchronous analog of
.BR fdatasync (2).
Note that this is a request only \(em this call does not wait
for I/O completion.
.LP
Apart from
.I aio_fildes
the only field in the structure pointed to by
.I aiocbp
that is used by this call is the
.I aio_sigevent
field (a \fIstruct sigevent\fP) that indicates the desired type of
asynchronous notification at completion.
All other fields are ignored.
.SH "RETURN VALUE"
On success (the sync request was successfully queued)
this function returns 0.
On error \-1 is returned, and
.I errno
is set appropriately.
.SH ERRORS
.TP
.B EAGAIN
Out of resources.
.TP
.B EBADF
.I aio_fildes
is not a valid file descriptor open for writing.
.TP
.B EINVAL
No synchronized I/O for this file is supported, or
.I op
is not
.B O_SYNC
or
.BR O_DSYNC .
.SH "CONFORMING TO"
POSIX.1-2001.
.SH "SEE ALSO"
.BR aio_cancel (3),
.BR aio_error (3),
.BR aio_read (3),
.BR aio_return (3),
.BR aio_suspend (3),
.BR aio_write (3)
.SH COLOPHON
This page is part of release 3.22 of the Linux
.I man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
