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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