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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "AIO_FSYNC" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" aio_fsync 
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.SH NAME
+aio_fsync \- asynchronous file synchronization (\fBREALTIME\fP)
+.SH SYNOPSIS
+.LP
+\fB#include <aio.h>
+.br
+.sp
+int aio_fsync(int\fP \fIop\fP\fB, struct aiocb *\fP\fIaiocbp\fP\fB);
+\fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIaio_fsync\fP() function shall asynchronously force all I/O
+operations associated with the file indicated by the file
+descriptor \fIaio_fildes\fP member of the \fBaiocb\fP structure referenced
+by the \fIaiocbp\fP argument and queued at the time
+of the call to \fIaio_fsync\fP() to the synchronized I/O completion
+state. The function call shall return when the synchronization
+request has been initiated or queued to the file or device (even when
+the data cannot be synchronized immediately).
+.LP
+If \fIop\fP is O_DSYNC, all currently queued I/O operations shall
+be completed as if by a call to \fIfdatasync\fP(); that is, as defined
+for synchronized I/O data integrity completion. If
+\fIop\fP is O_SYNC, all currently queued I/O operations shall be completed
+as if by a call to \fIfsync\fP(); that is, as defined for synchronized
+I/O file integrity completion. If the
+\fIaio_fsync\fP() function fails, or if the operation queued by \fIaio_fsync\fP()
+fails, then, as for \fIfsync\fP() and \fIfdatasync\fP(), outstanding
+I/O
+operations are not guaranteed to have been completed.
+.LP
+If \fIaio_fsync\fP() succeeds, then it is only the I/O that was queued
+at the time of the call to \fIaio_fsync\fP() 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.
+.LP
+The \fIaiocbp\fP argument refers to an asynchronous I/O control block.
+The \fIaiocbp\fP value may be used as an argument to \fIaio_error\fP()
+and \fIaio_return\fP() 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 [EINPROGRESS].
+When all data has been successfully transferred, the error
+status shall be reset to reflect the success or failure of the operation.
+If the operation does not complete successfully, the
+error status for the operation shall be set to indicate the error.
+The \fIaio_sigevent\fP member determines the asynchronous
+notification to occur as specified in \fISignal Generation and Delivery\fP
+when all
+operations have achieved synchronized I/O completion. All other members
+of the structure referenced by \fIaiocbp\fP are ignored.
+If the control block referenced by \fIaiocbp\fP becomes an illegal
+address prior to asynchronous I/O completion, then the behavior
+is undefined.
+.LP
+If the \fIaio_fsync\fP() function fails or \fIaiocbp\fP indicates
+an error condition, data is not guaranteed to have been
+successfully transferred.
+.SH RETURN VALUE
+.LP
+The \fIaio_fsync\fP() function shall return the value 0 to the calling
+process if the I/O operation is successfully queued;
+otherwise, the function shall return the value -1 and set \fIerrno\fP
+to indicate the error.
+.SH ERRORS
+.LP
+The \fIaio_fsync\fP() function shall fail if:
+.TP 7
+.B EAGAIN
+The requested asynchronous operation was not queued due to temporary
+resource limitations.
+.TP 7
+.B EBADF
+The \fIaio_fildes\fP member of the \fBaiocb\fP structure referenced
+by the \fIaiocbp\fP argument is not a valid file
+descriptor open for writing.
+.TP 7
+.B EINVAL
+This implementation does not support synchronized I/O for this file.
+.TP 7
+.B EINVAL
+A value of \fIop\fP other than O_DSYNC or O_SYNC was specified.
+.sp
+.LP
+In the event that any of the queued I/O operations fail, \fIaio_fsync\fP()
+shall return the error condition defined for \fIread\fP() and \fIwrite\fP().
+The error is returned in
+the error status for the asynchronous \fIfsync\fP() operation, which
+can be retrieved using
+\fIaio_error\fP().
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+The \fIaio_fsync\fP() function is part of the Asynchronous Input and
+Output option and need not be available on all
+implementations.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIfcntl\fP(), \fIfdatasync\fP(), \fIfsync\fP(), \fIopen\fP(),
+\fIread\fP(), \fIwrite\fP(), the Base Definitions volume of IEEE\ Std\ 1003.1-2001,
+\fI<aio.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .