18.10.2012 16:09, Michael Kerrisk (man-pages) пишет:
Is there somewhere a *detailed* description of how this feature would
be used? Lacking that, it's really hard to see how anything sane and
reliable can be done with MSG_COPY.
These patches are used by CRIU already.
So, you can have a look at the CRIU source code:
http://git.criu.org/?p=crtools.git;a=blob;f=ipc_ns.c;h=9e259fefcfc04ec0556bb722921545552e1c69f3;hb=HEAD
Sanity and reliability on the level you are talking about can be achieved,
only if you'll freeze all message users before peeking.
Okay -- that's the piece I was looking for. Thanks.
In this scenario, how do you find all of the message users?
It looks like there is no way to how find these users.
But I don't really think, that this is necessary.
I.e. nothing protects the queue from reading by some alien (not expected)
process in real life.
Or do you simply ensure that everything is frozen beforehand?
In this particular case - yes.
--
Best regards,
Stanislav Kinsbursky
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