David Famolari wrote :
> Hi,
> I've got irda running on my Thinkpad 600 to the point where it will
> discover devices. And 'cat /proc/net/irda/discovery' will return a
> device name. I would now like to be able to have that event act as a
> trigger for other events. For instance I'd like to be able to display a
> welcome message to that device when it is in range. Anybody have any
> ideas how I can do this? Or references where I might find what I'm
> looking for?
>
> thank you
> dave
In my IrDA patch, you have something to do that. You basically
open a socket and use the IRLMP_WAITDEVICE ioctl to be waken up when a
new device is in range. Then, it's easy to hook up the stuff
displaying a message or setting up the appropriate connection.
The big advantages are :
o you get the event as soon as it is produced
o 0% CPU load (no polling)
Furthermore, if you use the IRLMP_HINT_MASK_SET ioctl (also in
my IrDA patch), the previous ioctl will trigger only on devices
matching the hint bits you specify. And you also need to use
IRLMP_ENUMDEVICES to get the info about the device discovered.
One of the catch of the ioctl is that you can't do a "select"
on it, so you have to have a process/thread blocked on it. For that
reason, for IrNET I use a real file descriptor as the event channel (a
much better solution, but work only for IrNET for now).
My patches are at :
http://www.hpl.hp.com/personal/Jean_Tourrilhes/IrDA/Java.html
More recent patches (I'm finishing up 2.3.99-pre8) :
http://www.hpl.hp.com/personal/Jean_Tourrilhes/IrDA/IrNET.html
In the Java-IrDA tar file, you will find a sample program on
how to use the functionality...
As Dag has stated his intention to have a look at my patches,
I would expect this functionality to appear in the future in the
official IrDA stack in some form.
Happy now ?
Jean
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