Hi,
I noticed pulseaudio has problems starting when OSSv4 is loaded, and traced
it down to using select() and GET{I,O}SPACE with an mmap()'d device (PulseAudio
tries using mmap unless explicitly told otherwise). OSS doesn't support that,
and returns -EIO, which is an error code PulseAudio doesn't check for and
eventually leads to it failing to start. One might consider blaming Pulseaudio,
except:
A) These limitations aren't documented anywhere I can see. AFAICT FreeBSD's
implementation does support using select(),etc. with mmap().
B) OSS's return value isn't entirely consistent: It returns OSS_EIO when
select() is used (oss_audio_core.c / oss_audio_chpoll() ), but OSS_EPERM when
GETOSPACE is used with mmap. OSS_EIO seems wrong to me - the device is okay,
it's just select() isn't supported in the current mode.
Yours,
Yair K.
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