Instead of dup2(), use this 
open STDOUT, ">&SOCK_WRITE" or die "STDOUT: $!\n";

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The "fork" in ActivePerl is not a real fork, it just creates a separate thread. I think by using dup2() you are bypassing the logic that makes them work like separate processes with separate file descriptors.

In reply to Re: Windows weirdness after fork, dup2 by Thelonius
in thread Windows weirdness after fork, dup2 by sgifford

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