Re: [xml] xmlwriter, flush file buffer

[Daniel Veillard <veillard redhat com>]

On Thu, Mar 03, 2005 at 11:00:27AM +0100, Pierre Joye wrote:
> Hello,
>
> I'm a bit confused with xmlTextWriterFlush (simple wrapper around
> xmlOutputBufferFlush).
>
> I expected it to flush the IO and not only to flush the buffer to the
> IO. After a short review, it seems that xmlFileFlush should be called
> as well. Actually the buffer is just pushed out, and no system flush
> is done. xmlFileFlush being called only using the closecallback
> (default callback).
>
> Is it the expected behiavior?
>
> The problem is basically the same as described here:
> http://www.mail-archive.com/xml gnome org/msg00140.html
>
> My problem is that I have to mess up directly with the IO when using
> the libxml IO implementation.

  You can't call directly xmlFileFlush() from xmlOutputBufferFlush()
you must use one of the I/O callbacks. And it does call out->writecallback()
there is no "flush" notion at that level of the I/O stack.
  xmlOutputBufferFlush() means the data in the buffers are written to the
I/O, if you want a synchronous write then you should use an I/O open in
that mode.
  Checking for out->closecallback == xmlFileFlush and calling it in that
case might be doable, but a close is not a flush semantically.

Daniel

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