This slightly modified version using STDIN works fine, in a non-blocking manner for me on linux.
I just showed that your fcntl command doesn't work on Windows.
Is your error coming on a Windows platform? If thats so, nothing I can do, except encourage people to switch to a real operating system, instead of a game platform. :-)
Windows does have an equivalent to unix's file handles and select (events that can be tied to file handles and WaitForMultipleObjects), but Perl doesn't support them.
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