Messages in this thread | | | Date | Wed, 13 May 1998 21:11:20 -0700 (PDT) | From | Alex Belits <> | Subject | Re: [BUG] Passing FDs over pipes |
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On Thu, 14 May 1998, Richard Gooch wrote:
> Hi, all. With 2.1.97 I get "Socket operation on non-socket" when I > use sendmsg(2) to transfer a FD over a pipe. Transferring over a Unix > socket works fine.
This is exactly what it's supposed to do -- FD passing over anonymous pipes is a side-effect in their implementations that are done over socket code, not a standard BSD feature (as well as bidirectional transfer over pipes).
FD passing probably, and bidirectional transfer definitely was possible over pipes in 4.4BSD, however IMHO its derivatives (or at least FreeBSD) lost that functionality when pipes support was optimized, and the same thing can be expected in any system even if it isn't derived from 4.4BSD. I don't know exactly what was changed when in FreeBSD and Linux because I used pipes/sockets only how they were supposed to be used (judging by what is in R. Stevens' UNP), however I know that there definitely were similar things in 4.4BSD -> FreeBSD-2.x.x.
-- Alex
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