This is my second article in the "C/C++ library programming on Linux" series. I recommend that you read the first part of this article series where I've explained the whole library thing, and gave an example of creating and using static library.

C/C++ library programming on Linux – Part one: Static libraries

In this article I will explain dynamic libraries and compare them to static libraries. I will also give an example of creating and using dynamic library.

Dynamic (shared) libraries

Dynamic libraries are different from static libraries in a way that by using them, during compilation process, GCC ads only code "hooks" and soname. That "hooks" and library soname are used during the startup of your application to load correct library and connect "inside" with the "outside" code.

Background

One of the most important aspects of modern programming is concept of reuse of code. Even C programming language allows us to reuse our code using concepts like simple functions and structures. C++ programming language goes one step further and allows us to group related variables and functions into classes with the same purpose - the reuse of our valuable code. By using libraries we can go even further from sharing code inside one process - we can share code between completely different programs.

What changes when using libraries? Answer to that question is: "link phase" of your program. In this phase GNU linker links all code modules in fully functional program. When it comes to libraries on Linux operating system we have two basic concepts: static and dynamic (often called "shared"). In this article series I will do my best to explain both Linux libraries concepts using simple C language examples.