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AIO_FSYNC(3P)              POSIX Programmer's Manual             AIO_FSYNC(3P)



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may dif-
       fer (consult the corresponding Linux manual page for details of Linux behavior), or the interface  may  not  be
       implemented on Linux.

NAME
       aio_fsync - asynchronous file synchronization (REALTIME)

SYNOPSIS
       #include <aio.h>

       int aio_fsync(int op, struct aiocb *aiocbp);


DESCRIPTION
       The  aio_fsync()  function  shall asynchronously force all I/O operations associated with the file indicated by
       the file descriptor aio_fildes member of the aiocb structure referenced by the aiocbp argument  and  queued  at
       the  time  of  the call to aio_fsync() 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).

       If  op  is O_DSYNC, all currently queued I/O operations shall be completed as if by a call to fdatasync(); that
       is, as defined for synchronized I/O data integrity completion. If op is O_SYNC, all currently queued I/O opera-
       tions  shall  be  completed as if by a call to fsync(); that is, as defined for synchronized I/O file integrity
       completion. If the aio_fsync() function fails, or if the operation queued by aio_fsync() fails,  then,  as  for
       fsync() and fdatasync(), outstanding I/O operations are not guaranteed to have been completed.

       If aio_fsync() succeeds, then it is only the I/O that was queued at the time of the call to aio_fsync() that is
       guaranteed to be forced to the relevant completion state. The completion of subsequent I/O on the file descrip-
       tor is not guaranteed to be completed in a synchronized fashion.

       The  aiocbp  argument refers to an asynchronous I/O control block.  The aiocbp value may be used as an argument
       to aio_error() and aio_return() 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 aio_sigevent member determines the asynchronous  notifi-
       cation  to  occur as specified in Signal Generation and Delivery when all operations have achieved synchronized
       I/O completion. All other members of the structure referenced by aiocbp are ignored.  If the control block ref-
       erenced  by  aiocbp becomes an illegal address prior to asynchronous I/O completion, then the behavior is unde-
       fined.

       If the aio_fsync() function fails or aiocbp indicates an error condition, data is not guaranteed to  have  been
       successfully transferred.

RETURN VALUE
       The  aio_fsync()  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 errno to indicate the error.

ERRORS
       The aio_fsync() function shall fail if:

       EAGAIN The requested asynchronous operation was not queued due to temporary resource limitations.

       EBADF  The aio_fildes member of the aiocb structure referenced by the aiocbp  argument  is  not  a  valid  file
              descriptor open for writing.

       EINVAL This implementation does not support synchronized I/O for this file.

       EINVAL A value of op other than O_DSYNC or O_SYNC was specified.


       In  the  event that any of the queued I/O operations fail, aio_fsync() shall return the error condition defined
       for read() and write().  The error is returned in the error status  for  the  asynchronous  fsync()  operation,
       which can be retrieved using aio_error().

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       The  aio_fsync()  function is part of the Asynchronous Input and Output option and need not be available on all
       implementations.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       fcntl(), fdatasync(), fsync(), open(), read(), write(), the Base Definitions  volume  of  IEEE Std 1003.1-2001,
       <aio.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Stan-
       dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base  Specifica-
       tions  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 Stan-
       dard,  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 .



IEEE/The Open Group                  2003                        AIO_FSYNC(3P)