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 aio_fsync(2)							aio_fsync(2)




 NAME
      aio_fsync() - force outstanding asynchronous operations on a file to
      the synchronized state

 SYNOPSIS
      #include <&lt&lt&lt;aio.h>&gt&gt&gt;

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

 DESCRIPTION
      The aio_fsync() function asynchronously forces all I/O operations that
      are enqueued at the time of the call for the file or device referenced
      by aiocbp->&gt&gt&gt;aio_fildes to the synchronized I/O state.  The function
      call returns when the synchronization request has been enqueued to the
      file or device (even when the data cannot be synchronized
      immediately).

      Successful completion of the aio_fsync() request indicates that all
      modified data for aiocbp->&gt&gt&gt;fildes has been moved to a permanent storage
      device.  The aio_fsync() function affects only those asynchronous I/O
      operations enqueued at the time of the call.  Subsequently enqueued
      operations are not included in the synchronizing operation.

      The aio_fsync() function supports synchronized I/O for regular files,
      block special files, and character special files.

      If the op is O_DSYNC, all currently enqueued asynchronous I/O
      operations for aiocbp->&gt&gt&gt;fildes are completed as if by a call to
      fdatasync().  All data is forced to permanent storage but the meta-
      data (such as modification times) for the file descriptor is not
      necessarily updated.  If the op is O_SYNC, all currently enqueued
      asynchronous I/O operations for aiocbp->&gt&gt&gt;fildes are completed as if by
      a call to fsync().  All data is forced to permanent storage and the
      file descriptor metadata is updated.

      If an aio_fsync() request is issued for a file when there is already a
      pending aio_fsync() request, the first request is treated as though it
      were part of the second, and the second request will not complete
      until the first has completed.

      The aio_fsync() function returns when the fsync request has been
      enqueued for the referenced file or device.  The aio_error() and
      aio_return() functions must be used to retrieve the status of the
      synchronization operation via the aiocb referenced by aiocbp.  The
      status returned will be EINPROGRESS until the last operation addressed
      by the initial request completes.	 If all operations complete
      successfully, the error status will be 0 (zero).	Otherwise, the error
      status will be the error status that will be returned for the read or
      write operation that failed.





 Hewlett-Packard Company	    - 1 -   HP-UX Release 11i: November 2000






 aio_fsync(2)							aio_fsync(2)




      If aiocbp->&gt&gt&gt;aio_sigevent is a valid signal event structure, then the
      designated signal will be delivered when the requested synchronization
      operation completes, either when all subject requests have completed
      successfully or when any one of the requests has failed.

      To use this function, link in the realtime library by specifying -lrt
      on the compiler or linker command line.

 RETURN VALUE
      If the aio_fsync() function fails, -1 is returned and errno is set to
      indicate the error.

 ERRORS
      If aio_fsync() detects one of the following error conditions, errno is
      set to the indicated value:

	   [EAGAIN]	  The request could not be queued because a per-
			  process or system-wide limit on asynchronous I/O
			  operations or asynchronous threads would have been
			  exceeded.

	   [EBADF]	  The aiocbp->&gt&gt&gt;aio_fildes is not a valid file
			  descriptor open for writing.

	   [EINVAL]	  Synchronized I/O is not supported for the file
			  specified by aiocbp->&gt&gt&gt;aio_fildes.

	   [EINVAL]	  The aiocb->&gt&gt&gt;aio_sigevent is not a valid address in
			  the process virtual address space.

	   [EINVAL]	  The parameters of the indicated sigevent in
			  aiocb->&gt&gt&gt;aio_sigevent are invalid.

 SEE ALSO
      aio_cancel(2), aio_error(2), aio_read(2), aio_return(2),
      aio_suspend(2), aio_write(2), fdatasync(2), fsync(2), lio_listio(2),
      read(2), write(2), aio(5).

 STANDARDS CONFORMANCE
      aio_fsync(): POSIX Realtime Extensions, IEEE Std 1003.1b














 Hewlett-Packard Company	    - 2 -   HP-UX Release 11i: November 2000