This patch is necessary to get a dosemu-1.1.4+
to work with aureal drivers.
It changes the following:
- SNDCTL_DSP_POST must always be non-blocking
- SNDCTL_DSP_POST must not interrupt the output
- SNDCTL_DSP_SYNC must always be blocking
- drain_playback() must increase a fill_index
after setting the "in_use" for the current block.
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