>There is little one is allowed to expect from pipes according to
>POSIX. Traditionally, we were using socketpair(), so support for
>some socket ioctls should be retained. Not much more, IMHO. As a
>matter of fact, our pipes even didn't follow SysV semantics - they
>were unidirectional, but SVR4 pipes are birectional IIRC.

actually...while i know the strict "definition" of pipes is that they
are unidirectional with a single read and a single write endpoint, in
my (limited?) experience, i've always found pipes to be bidirectional.

including ours.

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