PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT

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

PROLOG         top

       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.

NAME         top

       aio_fsync — asynchronous file synchronization

SYNOPSIS         top

       #include <aio.h>

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

DESCRIPTION         top

       The aio_fsync() function shall asynchronously perform a file
       synchronization operation, as specified by the op argument, for 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().  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 operations 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
       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 descriptor 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 notification to occur as specified in Section 2.4.1,
       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 referenced by
       aiocbp becomes an illegal address prior to asynchronous I/O
       completion, then the behavior is undefined.

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

RETURN VALUE         top

       The aio_fsync() function shall return the value 0 if the I/O
       operation is successfully queued; otherwise, the function shall
       return the value −1 and set errno to indicate the error.

ERRORS         top

       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 The aio_fildes member of the aiocb structure refers to a file
              on which an fsync() operation is not possible.

       EINVAL A value of op other than O_DSYNC or O_SYNC was specified, or
              O_DSYNC was specified and the implementation does not provide
              runtime support for the Synchronized Input and Output option,
              or O_SYNC was specified and the implementation does not
              provide runtime support for the File Synchronization option.

       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 operation,
       which can be retrieved using aio_error().

       The following sections are informative.

EXAMPLES         top

       None.

APPLICATION USAGE         top

       None.

RATIONALE         top

       None.

FUTURE DIRECTIONS         top

       None.

SEE ALSO         top

       fcntl(3p), fdatasync(3p), fsync(3p), open(3p), read(3p), write(3p)

       The Base Definitions volume of POSIX.1‐2008, aio.h(0p)

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The Open
       Group Base Specifications Issue 7, Copyright (C) 2013 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
       applied.) 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.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the
       source files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                 2013                       AIO_FSYNC(3P)