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.TH AIO_FSYNC 3C "Feb 5, 2008"
.SH NAME
aio_fsync \- asynchronous file synchronization
.SH SYNOPSIS
.LP
.nf
#include <aio.h>

\fBint\fR \fBaio_fsync\fR(\fBint\fR \fIop\fR, \fBstruct aiocb *\fR\fIaiocbp\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBaio_fsync()\fR function asynchronously forces all I/O operations
associated with the file indicated by the file descriptor \fBaio_fildes\fR
member of the \fBaiocb\fR structure referenced by the \fIaiocbp\fR argument and
queued at the time of the call to \fBaio_fsync()\fR to the synchronized I/O
completion state. The function call returns when the synchronization request
has been initiated or queued to the file or device (even when the data cannot
be synchronized immediately).
.sp
.LP
If \fIop\fR is \fBO_DSYNC\fR, all currently queued I/O operations are completed
as if by a call to \fBfdatasync\fR(3C); that is, as defined for synchronized
I/O data integrity completion. If \fIop\fR is \fBO_SYNC\fR, all currently
queued I/O operations are completed as if by a call to \fBfsync\fR(3C); that
is, as defined for synchronized I/O file integrity completion. If the
\fBaio_fsync()\fR function fails, or if the operation queued by
\fBaio_fsync()\fR fails, then, as for \fBfsync\fR(3C) and \fBfdatasync\fR(3C),
outstanding I/O operations are not guaranteed to have been completed.
.sp
.LP
If \fBaio_fsync()\fR succeeds, then it is only the I/O that was queued at the
time of the call to \fBaio_fsync()\fR that is guaranteed to be forced to the
relevant completion state. The completion of subsequent I/O on the file
descriptor is not guaranteed to be completed in a synchronized fashion.
.sp
.LP
The \fIaiocbp\fR argument refers to an asynchronous I/O control block. The
\fIaiocbp\fR value may be used as an argument to \fBaio_error\fR(3C) and
\fBaio_return\fR(3C) in order to determine the error status and return status,
respectively, of the asynchronous operation while it is proceeding. When the
request is queued, the error status for the operation is \fBEINPROGRESS.\fR
When all data has been successfully transferred, the error status will be reset
to reflect the success or failure of the operation. If the operation does not
complete successfully, the error status for the operation will be set to
indicate the error. The \fIaio_sigevent\fR member determines the asynchronous
notification to occur when all operations have achieved synchronized I/O
completion (see \fBsignal.h\fR(3HEAD)). All other members of the structure
referenced by \fIaiocbp\fR are ignored. If the control block referenced by
\fIaiocbp\fR becomes an illegal address prior to asynchronous I/O completion,
then the behavior is undefined.
.sp
.LP
If the \fBaio_fsync()\fR function fails or the \fIaiocbp\fR indicates an error
condition, data is not guaranteed to have been successfully transferred.
.sp
.LP
If \fIaiocbp\fR is \fINULL\fR, then no status is returned in \fIaiocbp\fR, and
no signal is generated upon completion of the operation.
.SH RETURN VALUES
.sp
.LP
The \fBaio_fsync()\fR function returns \fB0\fR to the calling process if the
I/O operation is successfully queued; otherwise, the function returns
\fB\(mi1\fR and sets \fBerrno\fR to indicate the error.
.SH ERRORS
.sp
.LP
The \fBaio_fsync()\fR function will fail if:
.sp
.ne 2
.na
\fB\fBEAGAIN\fR\fR
.ad
.RS 10n
The requested asynchronous operation was not queued due to temporary resource
limitations.
.RE

.sp
.ne 2
.na
\fB\fBEBADF\fR\fR
.ad
.RS 10n
The \fBaio_fildes\fR member of the \fBaiocb\fR structure referenced by the
\fIaiocbp\fR argument is not a valid file descriptor open for writing.
.RE

.sp
.ne 2
.na
\fB\fBEINVAL\fR\fR
.ad
.RS 10n
The system does not support synchronized I/O for this file.
.RE

.sp
.ne 2
.na
\fB\fBEINVAL\fR\fR
.ad
.RS 10n
A value of \fIop\fR other than \fBO_DSYNC\fR or \fBO_SYNC\fR was specified.
.RE

.sp
.LP
In the event that any of the queued I/O operations fail, \fBaio_fsync()\fR
returns the error condition defined for \fBread\fR(2) and \fBwrite\fR(2). The
error will be returned in the error status for the asynchronous \fBfsync\fR(3C)
operation, which can be retrieved using \fBaio_error\fR(3C).
.SH USAGE
.sp
.LP
The \fBaio_fsync()\fR function has a transitional interface for 64-bit file
offsets.  See \fBlf64\fR(7).
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Committed
_
MT-Level	MT-Safe
_
Standard	See \fBstandards\fR(7).
.TE

.SH SEE ALSO
.sp
.LP
.BR fcntl (2),
.BR open (2),
.BR read (2),
.BR write (2),
.BR aio_error (3C),
.BR aio_return (3C),
.BR fdatasync (3C),
.BR fsync (3C),
.BR aio.h (3HEAD),
.BR fcntl.h (3HEAD),
.BR signal.h (3HEAD),
.BR attributes (7),
.BR lf64 (7),
.BR standards (7)