(or (socket-error-symbol c) (socket-error-errno c))
#+cmu (sb-unix:get-unix-error-msg num)
#+sbcl
- #+win32 (sb-win32::get-last-error-message num)
+ #+win32 (sb-win32:format-system-message num)
#-win32 (sb-int:strerror num)))))
(:documentation "Common base class of socket related conditions."))