TcpEventCode¶

//
// Event, strictly for the FSM state transition purposes.
// DO NOT USE outside performStateTransition()!
//
enum TcpEventCode {
    TCP_E_IGNORE = 0;

    // app commands
    // (Note: no RECEIVE command, data are automatically passed up)
    TCP_E_OPEN_ACTIVE = 1;
    TCP_E_OPEN_PASSIVE = 2;
    TCP_E_ACCEPT = 3;
    TCP_E_SEND = 4;
    TCP_E_CLOSE = 5;
    TCP_E_ABORT = 6;
    TCP_E_DESTROY = 7;
    TCP_E_STATUS = 8;
    TCP_E_QUEUE_BYTES_LIMIT = 9;
    TCP_E_READ = 10;
    TCP_E_SETOPTION = 11;

    // TPDU types
    TCP_E_RCV_DATA = 12;
    TCP_E_RCV_ACK = 13;
    TCP_E_RCV_SYN = 14;
    TCP_E_RCV_SYN_ACK = 15;
    TCP_E_RCV_FIN = 16;
    TCP_E_RCV_FIN_ACK = 17;
    TCP_E_RCV_RST = 18; // covers RST+ACK too

    TCP_E_RCV_UNEXP_SYN = 19; // unexpected SYN

    // timers
    TCP_E_TIMEOUT_2MSL = 20; // RFC 793, a.k.a. TIME-WAIT timer
    TCP_E_TIMEOUT_CONN_ESTAB = 21;
    TCP_E_TIMEOUT_FIN_WAIT_2 = 22;

    // All other timers (REXMT, PERSIST, DELAYED-ACK, KEEP-ALIVE, etc.),
    // are handled in TcpAlgorithm.
};