[Bug 278546] fdevname_r: pass partially uninitialized memory to kernel

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278546

--- Comment #7 from Mark Johnston <markj@FreeBSD.org> ---
(In reply to Paul Floyd from comment #6)
Sadly, there is no central registry of ioctls.  Having one would be very
useful, but there is no good mechanism to enumerate them (the best you can do
is grep for _IO(R|W)? in the system headers) and no way in general to tell what
the kernel will do with the parameter.

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