www.nico.schottelius.org/software/cinit/browse_source/cinit-0.0.8/doc/ipc.usenet.posting
Nico Schottelius 423ba10303 import cinit from unix.schottelius.org
Signed-off-by: Nico Schottelius <nico@ikn.schottelius.org>
2009-09-16 12:53:45 +02:00

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From: Nico Schottelius
Subject: Unix IPC, socket/AF_UNIX; bind on r/o devices?
Date: 09 May 2005 09:51:27 GMT
To: comp.unix.programmer
Hello!
Situation:
- everything mounted readonly (as when starting the system)
- one process with n children, which may have n children (recursive)
- all the children and children of children should be able to talk to the
first parent
Problem:
- Using bind() will fail, because
a) socket cannot created
b) the existing socket cannot be reused
Other possibilities not working:
- shared memory is not an option, as one need
-lrt, which needs -lpthread, which is problematic to link statically
- pipes: handling the pipes from parent to child of child of child
would be hard to program
- socketpair: should be the same problematic as it's with pipes
- fifos: one would have to create the fifos before and two fifos
for each child; possible, but very unelegant; and one would have
to memorize, which child is connected to which fifo; again possible,
but somehow unelegant
- signaling: one could implement communication with some kind of
morse code with signals, but that won't be a good solution
Questions:
- Is there any way, case b) (socket already existing) can be solved in
a way that I tell bind() to use an existing socket?
- What would be the best solution to talk bidirectional to clients
in this scenario?
I appreciate any hint, as I really like the socket mechanism and would
like to keep it.
Thanks in advance,
Nico