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Program Library HOWTO

Program Library HOWTO

David A. Wheeler

version 1.00, 22 March 2002

This HOWTO for programmers discusses how to create and use program libraries on Linux. This includes static libraries, shared libraries, and dynamically loaded libraries.

Table of Contents

1. Introduction

2. Static Libraries

3. Shared Libraries

3.1. Conventions
3.2. How Libraries are Used
3.3. Environment Variables
3.4. Creating a Shared Library
3.5. Installing and Using a Shared Library
3.6. Incompatible Libraries

4. Dynamically Loaded (DL) Libraries

4.1. dlopen()
4.2. dlerror()
4.3. dlsym()
4.4. dlclose()
4.5. DL Library Example

5. Miscellaneous

5.1. nm command
5.2. Special functions _init and _fini
5.3. Shared Libraries Can Be Scripts
5.4. GNU libtool
5.5. Removing symbols for space
5.6. Extremely small executables
5.7. Speeding up C++ initialization

6. More Examples

6.1. File libhello.c
6.2. File libhello.h
6.3. File demo_use.c
6.4. File script_static
6.5. File script_shared
6.6. File demo_dynamic.c
6.7. File script_dynamic

7. Other Information Sources

8. Copyright and License

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		Introduction