passing a C function back to C library

Hi!

[0] discusses how to pass a callback to some C library. Now I would like
to pass a function from some C library to some C library. Is there a
better way to express this than using <cCall ...> to get a smalltalk
function and CCallbackDescriptor to pass it back?

  Christoph

[0] https://www.gnu.org/software/smalltalk/manual/html_node/Smalltalk-callbacks.html

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On 19/02/2017 17:32, Christoph Egger wrote:
> Hi!
>
> [0] discusses how to pass a callback to some C library. Now I would like
> to pass a function from some C library to some C library. Is there a
> better way to express this than using <cCall ...> to get a smalltalk
> function and CCallbackDescriptor to pass it back?

You can get the address of a C function with something like

   CFunctionDescriptor addressOf: 'unlink'

If the function is not defined, the returned object will satisfy #isNull:

   st> (CFunctionDescriptor addressOf: 'unlink') isNull
   false
   st> (CFunctionDescriptor addressOf: 'aaa') isNull
   true

Paolo

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