Research of DSO application in PKI system

DSO is a kind of nifty mechanism used for dynamic linking/loading shared objects. It provides a way to build and load a piece of program code at run-time into the address space of an executable program. When Apache is selected to construct PKI bottom server framework, DSO can be used to create server functional modules. The advantage of DSO object shared and dynamically loaded rest with developing and maintaining program independently, spending less memory space, improving the flexibility of scheduler. This paper researches and discusses DSO implementation layers, invoking methods and communications between DSO modules in PKI certificate server based on Apache.