HDMI connect-event, automatic action

[trutlze]

Hi,

I want to plug in a HDMI-cable (connected to a display of course) into my computer and want FreeBSD to do something (i.e. running a script) after I've done it.

I thought of using devd (/etc/devd.conf), but I wasn't able to figure out the "HDMI-cable-plugin"-event. I don't know where to search for this event (it's not written to dmesg). I know that it might have something to do with devctl, but how can I see the output of this (kernel?-) process?

Thank in advance.

 

[aragon]

Unfortunately devd(8) doesn't catch all events, but to check if it does:

$ telnet /var/run/devd.pipe

And then try cause an event. If devd sees it, you'll get some text appearing in the telnet session.

 

[trutlze]

Nice to know! But like you expected the HDMI-connect event isn't caught

 

[wblock@]

The driver would have to notify the system of a connection event. If there's any software that can determine whether that cable is attached (maybe xrandr(1)), a shell script loop could be wrapped around it to form a crude daemon.

 

[trutlze]

OK, that's one solution.
But are there other already implemented possibilities in the system (like devctl(4)() would have been) but not yet revealed?