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I am wondering if it possible to determine if an accepted socket connection has been disconnected without trying to write to it.
IO::Select still indicates that the socket can be written to with can_write, even after the socket connection has been lost.
Is it possible to check if a TCP connection has been disconnected without writing to it (in the situation where there is an unplanned internet outage).
This is more a TCP than a Perl issue.
Events like a disconnected cable/internet connection do not lead to a TCP event. Thus you must write to a TCP connection to be sure that it is still connected. You might add a ping/echo message for the sole porpose to know that the connection is still available.