There is no reason for this ioctl at all. Either existing facilities provide what you need or what you want is a protocol violation we can't do.
I agree that 99 times out of ten such a mechanism serves only as a massive KLUDGE to paper-over application bugs. I'll also sadly point-out that such a mechanism exists in HP-UX 11.X and I suspect Solaris !-( I've spent probably the last decade or so attempting to discourage its use in the HP-UX space, but like some daemon from hell it just refuses to die.
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