How to Write Shared Libraries

1 Preface
	1.1 A Little Bit of History
	1.2 The Move To ELF
	1.3 How Is ELF Implemented?
	1.4 Startup: In The Kernel
	1.5 Startup in the Dynamic Linker
		1.5.1 The Relocation Process
		1.5.2 Symbol Relocations
		1.5.3 The GNU-style Hash Table
		1.5.4 Lookup Scope
		1.5.5 GOT and PLT
		1.5.6 Running the Constructors
	1.6 Summary of the Costs of ELF
	1.7 Measuring ld.so Performance
2 Optimizations for DSOs
	2.1 Data Definitions
	2.2 Export Control
		2.2.1 Use static
		2.2.2 Define Global Visibility
		2.2.3 Define Per-Symbol Visibility
		2.2.4 Define Visibility for C++ Classes
		2.2.5 Use Export Maps
		2.2.6 Libtool\'s -export-symbols
		2.2.7 Avoid Using Exported Symbols
	2.3 Shortening Symbol Names
	2.4 Choosing the Right Type
		2.4.1 Pointers vs. Arrays
		2.4.2 Forever const
		2.4.3 Arrays of Data Pointers
		2.4.4 Arrays of Function Pointers
		2.4.5 C++ Virtual Function Tables
	2.5 Improving Generated Code
	2.6 Increasing Security
	2.7 Simple Profiling of Interface Usage
3 Maintaining APIs and ABIs
	3.1 What are APIs and ABIs?
	3.2 Defining Stability
	3.3 ABI Versioning
	3.4 Restricting Exports
	3.5 Handling Compatible Changes (GNU)
	3.6 Handling Compatible Changes (Solaris)
	3.7 Incompatible Changes
	3.8 Using Versioned DSOs
	3.9 Inter-Object File Relations
A Counting Relocations
B Automatic Handler of Arrays of String Pointers
C Index
D References
E Revision History