On Sat, 2012-09-22 at 21:27 +0200, Frank Goenninger wrote:
> (also posted to comp.lang.lisp)
>
> Hi all:
>
> I have a lisp image that contains the following functions:
>
> (defun frgo (a)
> (format *debug-io* "~%~A~&" a)
> (values))
>
> (cffi:defcallback frgo_helper :void ((a-cstr :string))
> (frgo (cffi:foreign-string-to-lisp a-cstr)))
>
> In a C dynamic library I have:
>
> * file frgo_c.h:
>
> extern void frgo_helper( char * a );
>
> * file frgo_c.c:
>
> void frgo( char * a )
> {
> frgo_helper( a );
> }
>
> Now, the library does not compile - undefined symbol _frgo_helper() !
>
> How do I make functions "known" to C land that are purely defined as
> callbacks in Lisp land? You can't do that directly. Lisp callbacks must be passed to the C code as function pointers. You could write a C wrapper that calls the callback through a global variable and have the Lisp-side store the address of the callback in that variable. -- Stelian Ionescu a.k.a. fe[nl]ix Quidquid latine dictum sit, altum videtur. http://common-lisp.net/project/iolib
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