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Re: Passing file descriptors over a socket
- From: Dave Korn <dave dot korn dot cygwin at googlemail dot com>
- To: cygwin at cygwin dot com
- Date: Wed, 14 Oct 2009 06:41:16 +0100
- Subject: Re: Passing file descriptors over a socket
- References: <4AD55408.firstname.lastname@example.org>
Charles Wilson wrote:
> If not, what sort of "not" is it? (a) possible, but nobody has had the
> time or inclination to implement (b) not possible on win32 (c) possible,
> but REALLY hard -- case (a) on steroids.
Well, there's going to be DuplicateHandle involved in it, to copy the
underlying os handle into the new process, but that's going to be the
trivially easy bit. The real *tricky* part is likely going to be marshalling
the corresponding fhandler_* objects across process boundaries. That plus
there will probably be some required support to handle these fds and how they
interact across process groups, close-on-exec, fork and exec, etc., etc., -
all the usual tricky areas.
You probably should have had another option:
(d) Who knows? Not me, I've never scoped it out and maybe nobody has - the
obvious parts are easy to guess, but the unobvious parts are going to be where
all the complications arise.
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