site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com Hey Bogdan, http://lists.apple.com/archives/darwin-kernel/2010/Jan/msg00028.html Dan Le 2010-08-13 à 04:55, Bogdan Harjoc a écrit :

Hello,

I have recently had to move from a generic kext to an IOKit one, in order to get the lifecycle functionality that IOKit offers. Since my kext exposes a control device, I used to return an error in the kext stop function if unregistering the control device failed (i.e. a daemon was connected to it).

But none of the IOService callbacks that kexts usually override (stop, detach, free, ...) allow returning an error. And calling provider->retain() in device->start() doesn't prevent device->stop() from being called. Neither does device->adjustBusy(+1).

What I am currently doing is I override device->terminate() and I return false if the kext is busy. But since no IOKit documentation recommends this, I assume it's not the proper way do prevent unload.

My question is, how does one prevent cleanup when the kext is still busy ? (particularly when there are non-IOKit resources in use)

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