How Variadic - The GNU C Library

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#### A.2.2 How Variadic Functions are Defined and Used

Defining and using a variadic function involves three steps:

- Define the function as variadic, using an ellipsis (‘`...`’) in the argument list, and using special macros to access the variable arguments. See Receiving Arguments.
- Declare the function as variadic, using a prototype with an ellipsis (‘`...`’), in all the files which call it. See Variadic Prototypes.
- Call the function by writing the fixed arguments followed by the additional variable arguments. See Calling Variadics.