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The C language provides no built-in facilities for performing such common operations as input/output, memory management, string manipulation, and the like. Instead, these facilities are defined in a standard library, which you compile and link with your programs.
The GNU C library, described in this document, defines all of the library functions that are specified by the ISO C standard, as well as additional features specific to POSIX and other derivatives of the Unix operating system, and extensions specific to the GNU system.
The purpose of this manual is to tell you how to use the facilities of the GNU library. We have mentioned which features belong to which standards to help you identify things that are potentially non-portable to other systems. But the emphasis in this manual is not on strict portability.
1.1 Getting Started What this manual is for and how to use it. 1.2 Standards and Portability Standards and sources upon which the GNU C library is based. 1.3 Using the Library Some practical uses for the library. 1.4 Roadmap to the Manual Overview of the remaining chapters in this manual.
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