Invoke a foreign function called name in the foreign source code.
Each arg-type is a foreign type specifier, followed by arg, Lisp data to be converted to foreign data of type arg-type. result-type is the foreign type of the function's return value, and is assumed to be
:voidif not supplied.
%foreign-funcall-pointertakes a pointer ptr to the function, as returned by
foreign-symbol-pointer, rather than a string name.
;; Calling a standard C library function: (%foreign-funcall "sqrtf" :float 16.0 :float) => 4.0
;; Dynamic allocation of a buffer and passing to a function: (with-foreign-ptr (buf 255 buf-size) (%foreign-funcall "gethostname" :pointer buf :size buf-size :int) ;; Convert buf to a Lisp string using MAKE-STRING and %MEM-REF or ;; a portable CFFI function such as CFFI:FOREIGN-STRING-TO-LISP. )