As far as I'm aware, each handle (not a fileno, necessarily, as Windows handles exist for UI-Windows, process/thread handles, mutexes and various other things) is only valid per-thread. To pass a handle to another thread (or another process), you need to DuplicateHandle() it for the recipient.

In reply to Re^2: Pass filehandles around between (unrelated) processes on Windows by Corion
in thread Pass filehandles around between (unrelated) processes on Windows by Corion

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