[alsa-devel] [PATCH v2 1/3] ALSA: seq: Provide card number / PID via sequencer client info

[Martin Koegler]

On Thu, Mar 03, 2016 at 10:43:32AM +0100, Takashi Iwai wrote:
> > From: Martin Koegler <martin.koegler at chello.at>
> > 
> > rawmidi devices expose the card number via IOCTLs, which allows to
> > find the corresponding device in sysfs.
> > 
> > The sequencer provides no identifing data. Chromium works around this
> > issue by scanning rawmidi as well as sequencer devices and matching
> > them by using assumtions, how the kernel register sequencer devices.
> > 
> > This changes adds support for exposing the card number for kernel clients
> > as well as the PID for user client.
> > 
> > The minor of the API version is changed to distinguish between the zero
> > initialised reserved field and card number 0.
> > 
> > Signed-off-by: Martin Koegler <martin.koegler at chello.at>
> 
> This ABI change itself looks simple enough, so I have no big problem
> to merge if you can convince other people with it :)
> 
> Clemens?

The current solution has been proposed by him:
http://mailman.alsa-project.org/pipermail/alsa-devel/2016-February/104175.html

Regards,
Martin