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The GNU C Library

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A.2 Variadic Functions

ISO C defines a syntax for declaring a function to take a variable number or type of arguments. (Such functions are referred to as varargs functions or variadic functions.) However, the language itself provides no mechanism for such functions to access their non-required arguments; instead, you use the variable arguments macros defined in `stdarg.h'.

This section describes how to declare variadic functions, how to write them, and how to call them properly.

Compatibility Note: Many older C dialects provide a similar, but incompatible, mechanism for defining functions with variable numbers of arguments, using `varargs.h'.

A.2.1 Why Variadic Functions are Used  Reasons for making functions take variable arguments.
A.2.2 How Variadic Functions are Defined and Used  How to define and call variadic functions.
A.2.3 Example of a Variadic Function  A complete example.

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