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Is there a way to pass a socket between processes (not same address space) in Windows?
I find this info Shared Sockets, therefore believe that it is possible.
"The WSADuplicateSocket function is introduced to enable socket sharing across processes"...
More info : at source code of Apache (httpd-2.2.11-win32-src.zip) have usage for api WSADuplicateSocket with comments.
[EDIT]
Recently I find this great sample about this question.
How duplication is done in the unmanaged world - Socket Duplication - Part 1
Is it possible to transfer sockets from unmanaged processes? - Socket Duplication - Part 2
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You can share a socket between two (or more) processes in Linux and even Windows. Under Linux (Or POSIX type OS), using fork() will cause the forked child to have copies of all the parent's file descriptors.
1 Answer. Save this answer. Show activity on this post. Two processes cannot bind (and listen) to the same unix socket.
The system calls for establishing a connection are somewhat different for the client and the server, but both involve the basic construct of a socket. A socket is one end of an interprocess communication channel. The two processes each establish their own socket.
Sockets allow you to exchange information between processes on the same machine or across a network, distribute work to the most efficient machine, and they easily allow access to centralized data. Socket application program interfaces (APIs) are the network standard for TCP/IP.
See the Remarks section of WSADuplicateSocket. It effectively says you can use Your Favorite Interprocess Communication Scheme to send the WSAPROTOCOL_INFO structure (it's just data!) to the target.
There are lots of IPC schemes. I'd probably use shared memory with Boost::interprocess. But you could use SendMessage if the target has a window + message loop. Or the Clipboard API, for that matter (though somewhat weird). The mechanism is your choice.
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If you're creating the child process there are some things that might do it for you. See
http://www.tangentsoft.net/wskfaq/articles/passing-sockets.html (I know that this one worked in the ancient past; no idea if it works on current versions)
http://msdn.microsoft.com/en-us/library/ms682499.aspx
-- MarkusQ
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