Use sysread instead of reading <>, I mentioned it in comments in the script. And be sure to add a timeout value to your select loop.
sysread( \*STDIN, $input, 1024);
Update: I forgot to mention you can set the nonblocking flag on STDIN
fcntl(\*STDIN, F_SETFL, O_NONBLOCK) || die "$!\n";
# Set the non-block flags
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