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Iterate through the blocked requests, checking whether that file descriptor has been set by select, and update the fd_set to reflect current status. Here, we need to do some things: - keepalive timeouts simply close (this is special:: a keepalive timeout is a timeout where keepalive is active but nothing has been read yet) - regular timeouts close + error - stuff in buffer and fd ready? write it out - fd ready for other actions? do them