Re: Kern-control and enqueuing data

If you are using a dynamic kernel control, one where you register a name not a static id, the kernel will not fill in the unit number. The unit number at that point is undefined. You will get a unit number when a client attaches. You can track each client connection using the unit number. The control ref will always be the same, the unit number changes.

On Dec 5, 2005, at 12:39 AM, Sudarshan S wrote:

I have implemented a kern-control handler in kext. I want to pass some data to the user space program using recv queue. Whenever I tried to enqueue data using ctl_enqueuedata( ), it use to return an error code EINVAL. I was using the kern_ctl_ref and kern_ctl_reg.unit field that I got after ctl_register( ) call. Then I tried to enqueue data in setsockopt call handler (ctl_setopt) by using the parameters passed to that call and ctl_enqueuedata( ) worked fine.

Then I realized that the unit parameter passed to ctl_enqueuedata was not correct and the function was failing in kcb_find( ) call.

Is it correct to expect that kernel sets the proper value in kern_ctl_reg.unit after making ctl_register( ) call ?

Or is there any API to get the unit number by passing kern_ctl_ref ?

- Leo

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References:
	>Kern-control and enqueuing data (From: Sudarshan S <email@hidden>)