How is this different than plain old TCP urgent data? Except that
the receiver has to know where the special data is.
In its RFC incantation, it allows for out-of-order delivery of an
arbitrary (but limited) amount of data. The BSD implementation
made it largely unusable by widely distributing something that
didn't compute the offset correctly and only supported 1 byte of
urgent data, but its original form seems pretty close to what you
want, without the receiver having to know where the special
data is in advance. And the BSD-compatible form can be used
in a similar way, with the app doing the buffering instead of the
kernel.
Or am I missing something??
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