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

[Takashi Iwai]

At Mon, 25 May 2009 20:31:42 +0200 (CEST),
Jaroslav Kysela wrote:
> 
> On Mon, 25 May 2009, 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.
> >
> > Do you think fcntl on a pcm_t device would work (if we got it to compile
> > first :-)
> 
> snd_pcm_poll_descriptors / snd_pcm_poll_descriptors_count

... which doesn't return always all used fd's.

> But I wonder why snd_pcm_close() does not work in child process. Could you 
> show us 'strace -f -e trace=open,close' for your program?

Passing O_CLOEXEC would be the best solution, I think.
We just need a few additions.


Takashi