def-function

def-function
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Name

def-function — Declares a function. Macro

	  def-function name args &key module returning

name: A string or list specificying the function name. If it is a string, that names the foreign function. A Lisp name is created by translating #\_ to #\- and by converting to upper-case in case-insensitive Lisp implementations. If it is a list, the first item is a string specifying the foreign function name and the second it is a symbol stating the Lisp name.
args: A list of argument declarations. If NIL, indicates that the function does not take any arguments.
module: A string specifying which module (or library) that the foreign function resides. (Required by Lispworks)
returning: A declaration specifying the result type of the foreign function. If :void indicates module does not return any value.

Declares a foreign function.

(def-function "gethostname" 
  ((name (* :unsigned-char))
   (len :int))
  :returning :int)

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