[alsa-devel] Any issues with GETOSPACE OSS ioctl?

Clemens Ladisch clemens at ladisch.de
Thu Nov 6 13:31:44 CET 2008

Timur Tabi wrote:
> I have a customer who reports that when his OSS application makes several
> write() followed by SNDCTL_DSP_GETOSPACE, the returned value is not decreasing,
> which implies that the write() commands are not going through.

When write() doesn't return an error, it succeeded.

The GETOSPACE return value does not decrease as long as the written data
has not yet filled an entire fragment.  (This behaviour can be changed
with the partial-frag option; see


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