Need to understand how ioctl errors work.

I'm trying to understand how ioctl errors work. Who is responsible for returning a -1 for an error and passing the actual error number in errno? Do the functions miocack and miocnak play any part in this? Where can I find a desciption of miocack, miocnak?

Hi
The return value of ioctl is dependent upon the called device
control function. If for some reason the ioctl is not able to
call the corresponding device control function then a return
value of -1 is returned by the kernel and the errno set to
indicate the type of error.
-Manish Dixit
Sun - dts

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