I started to look into the audio setting issue I mentioned here a
couple of weeks ago (thread topic "Audio volume setting: not working -
sometimes?"). (9.1, amd64.)
Right away I ran into something I don't understand.
The implementation of AUDIO_SETINFO calls audio_file_setinfo with,
among other things, a variable called file. file is passed in from the
caller, which gets it from
KASSERT(fp->f_audioctx);
file = fp->f_audioctx;
However, I have completely failed to figure out where f_audioctx is
set. I find exactly one assignment to f_audioctx in the entire kernel
source tree, that being
fp->f_audioctx = NULL;
f_audioctx is #defined to f_undata.fd_audioctx, but fd_audioctx occurs
only twice in the whole tree:
struct audio_file *fd_audioctx; // DTYPE_MISC (audio)
#define f_audioctx f_undata.fd_audioctx
However, the KASSERT, combined with AUDIO_SETINFO doing something,
indicates that it clearly is getting set. So, I'm obviously missing
something.
What?
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