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Re: [Help-smalltalk] passing a C function back to C library
From: |
Paolo Bonzini |
Subject: |
Re: [Help-smalltalk] passing a C function back to C library |
Date: |
Mon, 20 Feb 2017 09:50:36 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.7.0 |
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
> Christoph
>
> [0]
> https://www.gnu.org/software/smalltalk/manual/html_node/Smalltalk-callbacks.html
>
>
>
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