OSI/TS Configuration and Management Manual

NonStop Kernel File-System Interface
OSI/TS Configuration and Management Manual—424831-001
7-24
Responding to Connection Requests
The remote TSEL with which you want to establish a connection is an attribute
of the subdevice. To make outgoing calls through the subdevice, this address
must be specified. The remote TSEL is specified when the subdevice is added
using SCF, or your application sets it by issuing a SETPARAM 15 call.
The CONTROL request completes when the connection handshaking procedure
completes successfully or aborts.
Responding to Connection Requests
After your application has opened a subdevice and set security or multiplexing
parameters, you can do either of the following:
•
Request connection establishment.
•
Prepare to wait for a connection-establishment request from a remote peer.
This subsection and the following two subsections discuss the second case the
previous subsection discusses the first case.
Procedures for Responding to a Connection Request
The procedure for responding to connection requests differs according to whether
the OSI/TS subsystem or the application handles the response protocol. This
procedure is summarized as follows, and is described in detail in the next two
subsections:
1. Assign the incoming connection request to a subdevice.
2. Specify who manages the response protocol:
•
If OSI/TS, issue a WRITEREAD or CONTROL 11 procedure call. This
is discussed in the following subsection, “OSI/TS Subsystem Manages the
Response Protocol.”
•
If the application, issue a WRITEREAD call, followed by either a
WRITE call or another WRITEREAD call. This is discussed in a later
subsection, “Application Manages the Response Protocol.”
These steps indicate that the application is ready to accept the T-CONNECT
indication service primitive.
Assigning Incoming Connection Requests to Subdevices
When a CR-TPDU arrives, the OSI/TS subsystem verifies that the SRC-REF
address is not in use or frozen. Then OSI/TS searches all subdevices in the
connection-establishment phase and not bound to a transport connection. OSI/TS
looks for a subdevice whose TSELs match those in the CR-TPDU.
OSI/TS searches subdevices in the following order:
•
Subdevices that specify a local TSEL
•
Subdevices that do not specify a local TSEL