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From: Jung-uk Kim <jkim@FreeBSD.org>
To: Martin Laabs <martin.laabs@mailbox.tu-dresden.de>
Date: Mon, 14 Jul 2008 20:20:07 -0400
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Cc: freebsd-ports-bugs@FreeBSD.org
Subject: Re: ports/125542: audio/oss does not return propper
	SNDCTL_DSP_GETBLKSIZE size
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This is one of the incompatibilities between FreeBSD vs. OSS API.

soundcard.h from FreeBSD:

#define SNDCTL_DSP_GETBLKSIZE	_IOR('P', 4, int)

soundcard.h from OSS:

#define SNDCTL_DSP_GETBLKSIZE	__SIOWR('P', 4, int)

Note FreeBSD version is read-only and OSS version is not.  It seems 
OSS version is wrong but it is an obsolete API:

http://manuals.opensound.com/developer/SNDCTL_DSP_GETBLKSIZE.html

You have two choices here.  Compile your appliacations with 
include/soundcard.h from OSS distribution or use 
SNDCTL_DSP_GET[IO]SPACE as recommeneded in the manual.  The latter is 
obviously better choice and there is no incompatibility between the 
two versions.

Jung-uk Kim