This section outlines typical sender and receiver scenarios for using the RSVP API calls.

An RSVP sender session might have these steps:

• Determine the sender and destination addresses and ports.

• Start a session with rapi_session(), and provide it with the name of your callback function.

• Call rapi_getfd() to obtain an alert socket.

• Call rapi_sender() to establish the program as a sender.

• Call select() to wait for a read on the alert socket.

• When data is ready to be read on the alert socket, call rapi_dispatch() to read it.

• Your callback routine is called as needed by rapi_dispatch().

• When your callback sees a reservation message from a receiver, go to the next step, otherwise go back to step 5.

• Process the flowspec information to determine packet size, and so on, and start sending data on a data socket.

  10.

  The select() call on the alert socket should continue to be used to watch for asynchronous error conditions.
  11.
  When you are finished sending the data, call rapi_release() to end the RSVP session.

  An RSVP receiver session might have these steps:

  • Determine the sender and destination addresses and ports, and if the destination is a multicast group, join it.

  • Call rapi_session() to start a session, and provide it with your callback function.

  • Call rapi_getfd() to get the alert socket.

  • Use select() to wait for a read on the alert socket.

  • When data is ready to be read on the alert socket, call rapi_dispatch() to read it.

  • Call rapi_dispatch() as needed to call your callback routine.

  • When your callback sees a path message from a sender, go to the next step, otherwise go back to step 4.

  • Process the adspec information in the path message to determine what the reservation should be, and call rapi_reserve() to let the sender(s) see reservation messages.

  • Call select() to begin listening for the data stream on a data socket. Continue to call select() on the alert socket as well, to watch for asynchronous error conditions.

    10.

    When you are finished receiving the data, use rapi_release() to end the RSVP session.

    Topics

    Determining Addresses and Ports Starting a Session
    Getting an Alert Socket
    Establishing the Program as a Sender
    Using Select() with the Alert Socket
    Callback Function Example
    Making a QoS Reservation
    Receiving a Reservation Message
    Watching for Asynchronous RSVP Events
    Closing the RSVP Session
    

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