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In this part of the 2019 WWDC session demo of DriverKit System Extensions you can see the driver and only the driver's log output being streamed using this command:

log stream --predicate 'sender = "MyUserUSBInterfaceDriver.dext"' --style syslog

I get no output, even when I add --debug and I do not know why. As far as I can tell, my extension lists the same as in ps. The presenter's output appears to come from kernel.development[0] and I have kernel[0]. I don't have a development kernel - is this why I see nothing?

If the above does not work, how can you conveniently monitor your extension's log output?

UPDATE
The predicate works with your bundle ID or IOUserServerName (not sure which, they're the same in USBApp), but only with log show, which reads from a file which is written occasionally, for me I think it was last updated on reboot:

log show --predicate 'sender == "sc.knight.MyUserUSBInterfaceDriver"'

But log stream gives me nothing, even when replacing the predicate with --process pid.

Rhythmic Fistman
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1 Answers1

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Not an optimal answer, but I use log stream | grep "My.Bundle"

jreing
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