At Mon, 31 Jul 2006 04:52:21 +0400,
Dmitry Baikov wrote:
>
> Hello!
>
> I'm writing a program that have to open all rawmidi ports, and
> periodically remove nonexisting ones, and open new ones (read, deal
> with usb-midi connect/disconnect).
>
> For example, we have USB-midi interface with 2 ports: hw:1,0,0 and hw:1,0,1
> To get the list, I make snd_ctl_open("hw:1), then walk through
> devices/subdevices and try to open all rawmidi ports. The problem is,
> that I can only open first one - hw:1,0,0, trying to open another
> gives "Device or resource is busy".
>
> If I do NOT have ctl opened, I can open all subdevices without trouble.
Could you check the behavior via strace?
> Another releated question is: how can I detect connection of a new
> usb-midi device?
> For now I use inotify on /dev/snd, but it's a kludge, cause I have to
> add sleep(1) before actual rescan of devices, or I miss the update.
HAL would be the best friest for such a thing.
Takashi
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