|
HP OpenVMS Systemsask the wizard |
|
The Question is: I am programming a client-server application using UCX V.4.1 and the DEC C++ compiler. Both use non-blocking sockets. The server sends packets up to about 8 KB long and checks for the total byte count transmitted (returned by send ()), retrying if an erro r is found until all the buffer is sent. The client uses recv () until the total amount of bytes is received or the buffer is empty (by checking to the recv() return value). It works for small packets (up to some hundred bytes), but when the packet size i s increased to some KB it starts to loose some data (not whole packets, but portions of them). For example, the server may send two packets 2000 bytes long and the client will receive them in one chunk of 3700 bytes long. Any idea? The Answer is : First, move to V5.0A. Then -- if the problem persists -- please contact the Compaq Customer Support Center. An example of some source code that demonstrates the failure will greatly simplify and speed the effort involved in locating the underlying cause. That said, use of the sys$qio interface to TCP/IP Services is often the easiest approach for event-driven programming. Also, please see topic 1661 here for a discussion of common OpenVMS programming mistakes.
|