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(libc.info)How Variadic

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How Variadic Functions are Defined and Used
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   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.  Note: Receiving Arguments.

   * _Declare_ the function as variadic, using a prototype with an
     ellipsis (`...'), in all the files which call it.  Note: Variadic
     Prototypes.

   * _Call_ the function by writing the fixed arguments followed by the
     additional variable arguments.  Note: Calling Variadics.

Variadic Prototypes

How to make a prototype for a function

with variable arguments.

Receiving Arguments

Steps you must follow to access the

optional argument values.

How Many Arguments

How to decide whether there are more arguments.

Calling Variadics

Things you need to know about calling

variable arguments functions.

Argument Macros

Detailed specification of the macros

for accessing variable arguments.

Old Varargs

The pre-ISO way of defining variadic functions.