Scieneer Common Lisp 1.3.9 online documentation

alien:callback-sap name[Function]

Return the system-area-pointer for the named callback name. The pointer may be passed to foreign code to call back into lisp. The pointer may change when lisp is restarted so it is recommended to call alien:callback-sap to obtain the pointer when needed. This function compiles to fast inline code. See also: alien:defcallback.