PIPE_BUF: POSIX & OBSD, *BSD and Linux

[Gustavo Rios <vieira_(_dot_)_rios_(_at_)_gmail_(_dot_)_com>]

Hey folks,

POSIX says there is no garantee for a process writing more than
PIPE_BUF on pipe there will be no data interleaving. Since i started
doing some research on such a topic.
Then i started to do seek man pages for the write family of functions.
For instance, Solaris man pages warn about the danger of writing
buffer longer than PIPE_BUF, i.e., in conformance with POSIX . But
with OBSD i could not figure out. So does OBSD strictly conforms with
POSIX or, in this regards, i can assure no data interleave for buffer
bigger than PIPE_BUF.

thanks.

PS: Is anyone aware about FreeBSD, NetBSD and Linux?