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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 differ (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  synchroniza-
       tion  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  com-
       pleted as if by a call to fdatasync(); that is, as defined for synchro-
       nized 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, 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
       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 oper-
       ation  does  not complete successfully, the error status for the opera-
       tion shall be set to  indicate  the  error.   The  aio_sigevent  member
       determines  the asynchronous notification to occur as specified in Sig-
       nal Generation and Delivery when all operations have achieved  synchro-
       nized  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  condi-
       tion, 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 tem-
              porary 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  Defi-
       nitions 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, 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 .

IEEE/The Open Group                  2003                        AIO_FSYNC(3P)