The study and development issues in the unix environment is using TCP/IP protocol to develop a point-to-point (PtoP) basic framework of the system-download process. The basic framework of the download includes a client and a number of download services-a process .First the client sends a download request to the Transport Server, and according to the information that the Transport Server returned , the server / client start data transmission. Then the Transport Server sends the download progress back, and at the same time the Transport Server updates its download resources database.
The key research topics in the unix environment is how to use socket to complete the process of communication.