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dsp/pcm: allow to mmap both read and write buffers using the same fd
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Description

dsp/pcm: allow to mmap both read and write buffers using the same fd

This brings our implementation in line with OSS specification for
systems that support mmap. The change should also improve compatibility
with OSS software not specifically written for FreeBSD, e.g. PulseAudio
OSS plugin.

Reviewed by: kib, jhb
MFC after: 1 week

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Provenance
avgAuthored on
Parents
rS221802: Cleaned up, but untested version of openssh5.8-dynwindow_noneswitch.diff
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Changes (1)

PathSize
head/
sys/
dev/
sound/
pcm/

rS221803

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head/sys/dev/sound/pcm/dsp.c

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