libc.info: Stdarg

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ANSI-standard macros, `stdarg.h'

   In ANSI C, a function has a variable number of arguments when its
parameter list ends in an ellipsis (`...').  The parameter list must
also include at least one explicitly named argument; that argument is
used to initialize the variable list data structure.
   ANSI C defines three macros (`va_start', `va_arg', and `va_end') to
operate on variable argument lists.  `stdarg.h' also defines a special
type to represent variable argument lists: this type is called
`va_list'.