The function async-io-state-handshake performs a handshake on async-io-state, which must be attached to SSL.
When the handshake has finished successfully or failed, callback is called with two arguments: async-io-state and an error-indicator. The error-indicator is nil when successful, otherwise it is a list suitable for an error call as in (apply 'error error-indicator). The async-io-state-read-status of async-io-state is also set appropriately.
If the handshake does not finish in timeout seconds, callback is called with non-nil error-indicator: ("Handshake timed out"), and the async-io-state-read-status is set to :timeout. If the other side closes the socket cleanly, callback is called error-indicator: ("SSL connection closed"), and the async-io-state-read-status is set to :eof. Other cases indicate an actual error in the handshake.
async-io-state-handshake must not be called when there is any other operation on async-io-state and new operations on async-io-state must not be started until callback has been called.
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