The GNU C Library - How Variadic

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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.

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-ANSI way of defining variadic functions.

Next: Variadic Example Up: Variadic Functions

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-ANSI way of defining variadic functions.