📄 rfc121.txt
字号:
20, The foreign socket terminated the connection before completion of the send operation; not all the data was transmitted 36, Either hardware at the foreign site is inoperative, or the NCP's counterpart at the foreign site does not exist or has failed 44, By operator command, all Network operations were terminated the socket will be closed 52, One or more interrupts were received from the foreign socket; the operation was suppressed 60, An NCP control transmission error occurred; the operation was aborted and the socket will be closed 64, A transmission error occurred; the operation was aborted and the socket will be closed (4) RECEIVE This operation causes data to be received from the foreign socket. Processing at the terminal is suspended until the data sent by the foreign socket has been received by the local socket and processed. The possible key sequences are as follows:Krilanovich [Page 7] RFC 121 Network On-Line Operators April 1971 LOAD Q1 LOAD +Q1 LOAD -Q1 Q2, Q3 RETURN LOAD .Q1 Q4 RETURN where Q1 is the completion code variable associated with the local socket. Q2 is a positive integer, or a LO storage location, less then 256. Q3 is a positive integer, or a LO storage location, less than 65536 Q4 is a positive integer less than 5. If Q1 is the first key after LOAD, one or more standard messages will be received and executed. The data may or may not be executed, as soon as it is received, depending on the op code. Processing of manual keypushes is suspended until a trailer is received. If Q1 is preceded by a '+', the operation is as above, except that only one message, with no trailer, is received, and the operation is only performed if there is data queued for the local socket, ready to be received. ('LOAD +' is intended mainly for use with the Network On-Line Interface.) If Q1 is preceded by a '-', a string of text whose length, in bits, is Q3, is received and processed according to the op code Q2. If a '.' precedes Q1, Q4 bytes of data are read and placed, right justified, in the LO accumulator. The following completion codes are possible for this operation: 0, The operation was successful and the data has been received 4, The specified local socket is not a receive socket; the operation was suppressed 8, The specified completion code variable is not assigned to a socket; the operation was suppressed 12, A previous receive operation is in progres; the operation was suppressed 16, The connection is not fully open; the operation was suppressed 20, The foreign socket terminated the connection before completion of the receive operation; data is unpredictable 36, Either hardware at the foreign site is inoperative, or the NCP's counterpart at the foreign site does not exist or has failed 44, By operator command, all Network operations wereKrilanovich [Page 8] RFC 121 Network On-Line Operators April 1971 terminated; the socket will be closed 52, One or more interrupts were received from the foreign socket; the operation was suppressed 60, An NCP control transmission error occurred; the operation was suppressed and the socket will be closed 200, There was no data queued for the local socket; the operation was suppressed (applicable only to 'LOAD +') (5) CHECK This operation causes the status of the specified local socket to be displayed. There is no completion code variable associated with this operation, since it is always successful and the socket is identified by its socket number. This operation is valid at any time, and with one exception, noted below, is always completed immediately. The possible key sequences are as follows: DISPLAY (Q RETURN...)... DISPLAY (Q?)... DISPLAY RETURN... where Q is the socket number of the local socket whose status is to be displayed. Successive RETURN'S will display the status of local sockets with successively higher socket numbers, and once DISPLAY has been pushed, it need not be pushed for subsequent occurrences of Q. If Q is followed by a '?', processing at the terminal will be suspended until the socket is not in the closed state, at which time the status will be displayed. If the socket is not closed at the time the '?' is pushed, response is as if the '?' were a RETURN. If DISPLAY is followed immediately by a RETURN, the status of all non-closed sockets owned by the terminal is displayed, each preceded by its associated completion code variable. If this information is more than will fit on one tube, successive RETURN'S will display the remainder of the information.Krilanovich [Page 9] RFC 121 Network On-Line Operators April 1971 The status has the following format: 'lclno' 'mnem' 'fgnsite' 'fgnno' 'deficit' where 'lclno' is the socket number of the local socket. 'mnem' is a mnemonic of up to eight characters for the status. 'fgnsite' is the site number of the foreign socket, or blank. 'fgnno' is the socket number of the foreign socket, or blank. 'deficit' is the send/receive deficit in the form 'bytes.bits', or blank. Following are the possible mnemonics, together with their interpretations: 'MNEM' MEANING ______ _______ OPEN A connection is fully established. No SEND/RECEIVE operation is in progress. 'fgnsite' and 'fgnno' are the site number and the socket number of the connected socket. 'deficit' is the number of bits queued locally at the socket by the NCP and available to satisfy a future RECEIVE operation, or awaiting output as the result of a previous SEND operation. LISTEN A LISTEN has been issued. CONNECT A CONNECT has been issued. 'fngsite' and 'fgnno' are the site and socket numbers of the foreign socket. DECISION A LISTEN has been completed. 'fgnsite' and 'fgnno' are the site and socket numbers of the calling socket. CALL(S) One or more calls have been received for the local socket. No LISTEN or CONNECT has been issued. I/O A connection is fully established. A SEND/RECEIVE operation is in progress. 'fgnsite'Krilanovich [Page 10] RFC 121 Network On-Line Operators April 1971 and 'fgnno' are the site and socket numbers of the connected socket. 'deficit' is the number of bits yet to be sent or received. CLOSED The socket is in the closed state. <--DRAIN The foreign socket is attempting to close the connection. The NCP has data yet to be read by the local socket. 'fgnsite' and 'fgnno' are the site and socket numbers of the connected socket. 'deficit' is the number of bits yet to be received. DRAINED The foreign socket is attempting to close the connection. The NCP is awaiting arrival at the foreign site of data currently in transit. 'fgnsite' and 'fgnno' are the site and socket numbers of the connected socket. CLOSING The local socket has issued a CLOSE. The NCP is in the process of returning the local socket to the closed state. 'fgnsite' and 'fgnno' are the site and socket numbers of the connected socket. DRAIN--> The local socket has issued a CLOSE. The NCP is completing the last SEND operation before returning the local socket to the closed state. 'fgnsite' and 'fgnno' are the site and socket numbers of the connected socket. 'deficit' is the number of bits the NCP has yet to transmit. (6) IDENTIFY This operation is used to identify a local socket by its completion code variable. The operation is valid at any time, and is always completed immediately. Since it is always successful, there are no completion codes for the operation, and the contents of the completion code variable are not changed. The key sequence is: ID Q... where Q is the completion code variable associated with the local socket.Krilanovich [Page 11] RFC 121 Network On-Line Operators April 1971 The response is a display of Q, followed by 'IS UNDEFINED' if the socket is in the closed state, or the socket number associated with it if it is not closed. After ID has been pushed once, it need not be pushed again for subsequent occurrences of Q. (7) PURGE This operator is used to dissociate all completion code variables from sockets, and to issue a CLOSE to all sockets currently in use at the terminal. The operation is valid at any time, and is always completed immediately. Since it is always successful. there are no completion codes for the operation, and the contents of the completion code variables are not changed. The key sequence is: DEL RETURN (8) SIGNAL This operation is used to convey a signal to the foreign process. The significance of the signal is completely user-dependent. The effect is that the next time the foreign socket attempts to initiate a RECEIVE or SEND operation, the operation will be suppressed, and a completion code supplied indicating that a signal had been received. Processing at the terminal is suspended until the signal has been sent to the foreign NCP. This operation is valid only when the socket is fully open. The key sequence is: REFL Q where Q is the completion code variable associated with the local socket. The following completion codes are possible for this operation: 0, The operation was successful, and the signal has been sent 4, The specified completion code variable is not assigned to a socket; the operation was suppressed 8, The connection is not fully open;the operation was suppressedKrilanovich [Page 12] RFC 121 Network On-Line Operators April 1971 (9) CONVERSATIONAL CONTROLLER This operator is intended primarily for use with the Network On- Line Interface, and is used to carry on a 'conversation' with the foreign process. Any data queued locally for the specified local receive socket is received and displayed as characters. Any keys pushed will be sent from the specified local send socket. The user has the option of specifying whether or not upper keyboard buttons are to be sent. In any case, the buttons ERASE, REPEAT, ENTER, PRED, and RESET, will not be sent, and pushing any of these, except RESET, will cause suspension of data reception until a button other than these four is pushed. Pushing RESET always terminates the operation. The key sequence is as follows: ARG [,] [-]Q1[-]Q2 where Q1 is the completion code variable associated with the local send socket. Q2 is the completion code variable associated with the local receive socket. If ARG is followed by ',', both upper and lower keyboard buttons will be sent, and the operation will be terminated only by pushing RESET. If no ',' follows ARG, only lower keyboard buttons will be sent, and the operation is terminated by pushing RESET or any upper keyboard button. If a '-' precedes Q1, no headers will be sent, and if a '-' precedes Q2, no headers will be received. In any case, if headers are to be received, the operation is terminated when a trailer is received, and a corresponding trailer is sent if headers are to be sent. The completion codes for the send socket are the same as for the SEND operation, and the completion codes for the receive socket are the same as for the RECEIVE operation. If a non-zero completion code is found, a message is displayed, either 'OUTPUT ERROR' or 'INPUT ERROR', depending on whether the send socket for the receive socket encountered the non-zero completion code, and the operation is terminated. [ This RFC was put into machine readable form for entry ] [ into the online RFC archives by Gruss Gottfried 01/98 ]Krilanovich [Page 13] ⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -