All queued partial frames are sent when the option is cleared again. Argument is a pointer to an integer. Argument is an pointer to an integer for the test result. Argument is an integer. When a network error occurs, TCP tries to resend the packet.
Some applications require a quicker error notification.
When this option is enabled, all incoming errors are immediately passed to the user program. Use this option with care - it makes TCP less tolerant to routing changes and other normal network conditions. The other end closed the socket unexpectedly. The other end didn't acknowledge retransmitted data after some time. Not all errors are documented.