[alsa-devel] Third time: Unlink PCM resource ?

Jaroslav Kysela perex at perex.cz
Mon May 25 20:39:45 CEST 2009

On Mon, 25 May 2009, Takashi Iwai wrote:

> At Mon, 25 May 2009 20:27:14 +0200,
> Werner Van Belle wrote:
>> Takashi Iwai wrote:
>>> You can control it via fcntl().  See fcntl(2) man page.
>> I looked at that but I didn't find any place in alsalib (or libalsa
>> whatever the order of those two words), where I can obtain the file
>> handle. They are all of type pcm_something_t. I found a file handle
>> quite deep in this library but there seems no way to actually obtain
>> that handle.
> OK, I see the problem now, too.  In practice, you can get a file
> descriptor from poll descriptor, but this doesn't cover all underlying
> fds.  A new API function or an additional SND_PCM_* flag for
> snd_pcm_open() would be needed, indeed.

The question is if it's not better to free also allocated memory 
associated to the pcm handle in child process - so snd_pcm_close() 
call in child is not a bad idea.

Jaroslav Kysela <perex at perex.cz>
Linux Kernel Sound Maintainer
ALSA Project, Red Hat, Inc.

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