On Tuesday 24 January 2012, Pekka Enberg wrote:

On Tue, 2012-01-24 at 13:40 -0200, Marcelo Tosatti wrote:

quoted

What is the practical advantage of a syscall, again?

Why do you ask? The advantage for this particular case is not needing to
add ioctls() for configuration and keeping the file read/write ABI
simple.

The two are obviously equivalent and there is no reason to avoid
ioctl in general. However I agree that the syscall would be better
in this case, because that is what we tend to use for core kernel
functionality, while character devices tend to be used for I/O device
drivers that need stuff like enumeration and permission management.

	Arnd

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