Last Edited by: Taft, January 4, 1984 11:09 am
John Larson, April 14, 1986 11:19:47 pm PST
DIRECTORY
IPDefs USING [Datagram],
TCP USING [Reason, TCPInfo],
TCPOps USING [TCPHandle];
TCPStates:
CEDAR
DEFINITIONS
~ BEGIN
Open:
PROC [tcpInfo:
TCP.TCPInfo]
RETURNS [handle: TCPOps.TCPHandle];
Attempts to open a new TCP connection. Returns a TCPHandle to use or raises TCP.OpenFailed if the Open request conflicts with an existing request or is a duplicate Open request on the same connection. The connection is open either in the LISTEN or SYNSENT state. In the LISTEN state, wait for a SYN from the remote TCP; in the SYNSENT state, send a SYN to initiate the connection. If an Open call is done to open a connection in the LISTEN state, then another Open call can be done to send the SYN and put the connection in the SYNSENT state.
Close:
PROC [handle: TCPOps.TCPHandle];
Close the TCP connection; raises an error if the connection does not exist or is already closing. Sends a FIN to the remote TCP. Note that the user may receive more data from the remote TCP after calling Close.
Abort:
PROC [handle: TCPOps.TCPHandle];
Abort the connection. This routine sends a TCP Reset if necessary; it calls CloseConnection to dispose of all the connection specific storage.
CloseConnection:
PROC [handle: TCPOps.TCPHandle, reason:
TCP.Reason];
Clear off the transmit and retransmit queues and remove this handle form the list.
ValidHandle:
PROC [handle: TCPOps.TCPHandle];
Check if handle given as argument by user is valid. Called by Abort, Close, and Send. Raises TCP.StreamClosing if bad handle, else it just returns.
FindHandle:
PROC [rcvdDatagram: IPDefs.Datagram]
RETURNS [handle: TCPOps.TCPHandle];
Find matching handle for segment received from the net.
CopyHandleList:
PROC
RETURNS [handleListCopy:
LIST
OF
REF
ANY];
Make a copy of the handle list for the retransmit procedure to look at.
GetInitialSequenceNumber:
PROC
RETURNS [
INT];
Generate an initial send sequence number for a connection.
END.