How to find out captured audio data is stored completely

We are using livepkgr to capture audio with AMS Standard. Since server-side scripting is not available with AMS Standard, we are using a PHP script to manipulate captured audio. Everything works well in testing, but we are wondering about the following.

When we close an audio capture session with:

   nsPublish.attachAudio(null);

   nsPublish.close();

can we assume that all the audio data has been written to the stream file? What if the server is busy with many simultanenous capture sessions? Is there a way to verify that a steam file is complete, closed, and ready for processing?

Thank you very much!