eval sets $@ when it catches an exception, yet you check $! in the first snippet.

In the second snippet, you're relying on $! being false when there has been no error, but $!'s value is undefined (which is not to say that $! is undef) in that circumstance.

In reply to Re^2: No data received on client socket by ikegami
in thread No data received on client socket by rbi

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