Does it work if you change the exec to

        die "Unable to exec\n" unless(exec("/usr/bin/ssh localhost /bi
+n/sleep 10 </dev/null"));

[download]

or

        die "Unable to exec\n" unless(exec("/usr/bin/ssh -n localhost 
+/bin/sleep 10"));

[download]

IIRC ssh may be pre-reading STDIN and then discarding the contents when it's not actually needed. Redirecting stdin for the ssh command makes sure there won't be any interference with your main program.

In reply to Re: Early termination of STDIN with combination of ssh and sleep by Crackers2
in thread Early termination of STDIN with combination of ssh and sleep by orleans704

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