📄 rfc120.txt
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(2) CLOSE
This operation is a request that the specified local socket be
returned to the closed state. If the last operation involving this
socket was a LISTEN, this operation refuses the foreign process'
connection attempt. If the last operation was a CONNECT, the
attempt is aborted. If a connection is established, any data in
transit from the local socket is allowed to reach the foreign
socket and to be either received or flushed before the local socket
is closed. The subprogram will wait until the socket has been
returned to the closed state.
The calling sequence is as follows:
CALL @CLOSE(cmpcd,time);
where
'cmpcd' is the completion code variable associated with the
local socket.
'time' is the length of time the subprogram is to wait for the
completion of the operation.
The following completion codes are possible for this operation:
0, The operation was successful, and the socket has been
returned to the closed state
8, The specified completion code variable is not currently
assigned to a socket; the operation was suppressed
12, The specified local socket is in the process of being
closed; the operation was suppressed, but the local
socket will be closed
36, Either hardware at the foreign site is inoperative, or the
NCP's counterpart at the foreign site does not exist or
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RFC 120 NETWORK PL1 SUBPROGRAMS
has failed
44, By operator command, all Network operations were
terminated; the socket will be closed
60, An NCP control transmission error occured; the operation
was aborted
64, A transmission error occured; the operation was aborted,
but the socket will be closed
252, The specified time limit was exceeded; the operation was
initiated but not completed
(3) SEND
This operation causes data to be sent to the foreign socket. The
subprogram will wait until the data has been received by the
foreign socket, or until it has been queued locally by the NCP.
The calling sequence is as follows:
CALL @WRITE(cmpcd, bfr,len,time[,offset]);
where
'cmpcd' is the completion code variable associated with the
local socket.
'bfr' is the data to be sent, and must be a singly dimensioned
array, either DECIMAL or BINARY, FIXED or FLOAT.
'len' is the number of bits of data to be sent. If 'len' is
non-positive, no operation is performed. 'len' has the
attribute BINARY FIXED(31,0).
'time' is the length of time the subprogram is to wait for the
completion of the operation.
'offset' is the bit offset from the first bit of 'bfr' at
which data transmission is to begin, and must have the
attributes BINARY FIXED(31,0). If not specified,
'offset' defaults to zero.
The following completion codes are possible for this operation:
0, The operation was successful, and the data has been sent
4, The specified local socket is not a SEND socket; the
operation was suppressed
8, The specified completion code variable is not assigned to
a socket; the operation was suppressed
12, A previous SEND operation is in progress; the operation
was suppressed
16, The connection is not fully open; the operation was
suppressed
20, The foreign socket terminated the connection before
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RFC 120 NETWORK PL1 SUBPROGRAMS
completion of the SEND operation; not all 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
56, An addressing exception was encountered with respect to
the data buffer; the operation was suppressed
60, An NCP control transmission error occured; the operation
was suppressed
64, A transmission error occured; the operation was aborted,
and the socket will be closed
252, The specified time limit was exceeded; the operation was
initiated but not completed
(4) RECEIVE
This operation causes data to be received from the foreign socket.
The subprogram will wait until the reception of data is complete.
The calling sequence is as follows:
CALL @READ(cmpcd,bfr,len,time[,offset]);
where
'cmpcd' is the completion code variable associated with the
local socket.
'bfr' is the variable into which the data is to be placed, and
must be a singly dimensioned array, DECIMAL or BINARY,
FIXED or FLOAT.
'len' is the number of bits of data to be received. If 'len'
is non-positive, no operation is performed. 'len' has
the attribute BINARY FIXED(31,0).
'time' is the length of time the subprogram is to wait for the
completion of the operation.
'offset' is the bit offset from the first bit of 'bfr' at
which the first bit of data is to be placed, and must
have the attributes BINARY FIXED(31,0). If not
specified, 'offset' defaults to zero.
The following completion codes are possible for this operation:
0, The operation was successful and the data has been
received
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RFC 120 NETWORK PL1 SUBPROGRAMS
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 progress; 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 were
terminated; the socket will be closed
24, An addressing or protection exception was encountered with
respect to the data buffer; the operation was suppressed
52, One or more interrupts were received from the foreign
socket; the operation was suppressed
60, An NCP control transmission error occured; the operation
was aborted, and the socket will be closed
252, The specified time limit was exceeded; the operation was
initiated but not completed
(5) CHECK
This operation causes the status of the specified local socket to
be returned. 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 is always completed immediately.
The calling sequence is as follows:
CALL @CHECK(lclsck,stat,mnem,fgnsck,deficit);
where
'lclsck' is the socket identifier of the local socket.
'stat' is a code for the status, and has the attribute BINARY
FIXED(31,0).
'mnem' is a mnemonic for the status, and has the attribute
CHARACTER, of any fixed length greater than or equal to
eight. If 'mnem' is longer than eight bytes, it will be
padded to the right with blanks.
'fgnsck' is the socket identifier of the foreign socket, or
zero.
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RFC 120 NETWORK PL1 SUBPROGRAMS
'deficit' is the send/receive deficit in bits, or zero, and
has the attributes BINARY FIXED(31,0).
'lclsck' is the only argument the programmer need define;
the others are output from the subprogram.
Following are the possible status codes, together with their
mnemonics and interpretations.
'STAT' 'MNEM' MEANING
---- ----
0 OPEN A connection is fully established. No
SEND/RECEIVE operation is in progress.
'fgnsck' is the socket identifier 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.
1 LISTEN A LISTEN has been issued.
2 CONNECT A CONNECT has been issued. 'fgnsck' is the
socket identifier of the foreign socket.
3 DECISION A LISTEN has been completed. 'fgnsck' is
the socket identifier of the calling
socket.
4 CALL(S) One or more calls have been received for
the local socket. No LISTEN or CONNECT has
been issued.
5 I/O A connection is fully established. A
SEND/RECEIVE operation is in progress.
'fgnsck' is the socket identifier of the
connected socket. 'deficit' is the number
of bits yet to be sent or received.
6 CLOSED The socket is in the closed state.
7 <--DRAIN The foreign socket is attempting to close
the connection. The NCP has data yet to be
read by the local socket. 'fgnsck' is the
socket identifier of the connected socket.
'deficit' is the number of bits yet to be
received.
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RFC 120 NETWORK PL1 SUBPROGRAMS
8 DRAINED The foreign socket is attempting to close
the connection. The NCP is awaiting
arrival at the foreign site of data
currently in transit. 'fgnsck' is the
socket identifier of the connected socket.
9 CLOSING The local socket has issued a CLOSE. The
NCP is in the process of returning the
local socket to the closed state. 'fgnsck'
is the socket identifier of the connected
socket.
10 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. 'fgnsck' is the socket
identifier 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 calling sequence is as follows:
CALL @ID(cmpcd,lclsck);
where
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