[cffi-devel] New foreign library interface

[Frank Goenninger - PRION Consulting]

Am 07.01.2006 um 20:25 schrieb Luís Oliveira:

> On 2006-jan-07, at 16:52, Frank Goenninger - PRION Consulting wrote:
>>> We don't really search for the library ourselves. dlopen() takes  
>>> care of that for us. It was just an example.
>>
>> Ah. So, if you want to make dlopen() handle all searching, then  
>> you'd have to extend the respective environment variable with user- 
>> supplied search paths. Which brings us to ? Yes, platform- 
>> dependent putenv() calls or whatever the Lisp implementation's way  
>> is to set an env var. Or do I misunderstand still somethimng here?
>
> Hmm, I'm not sure what you mean. What happens is that, if dlopen()  
> can't find the library, we try finding it in one of the directories  
> in the cffi:*foreign-library-directories* list.

I assumed you would do that. Now you've confirmed that. Thanks.

dlopen() of course does not always return a real error if it couldn't  
find the lib (in some cases I had a return value of NULL which in  
some cases meant that there was an error and in some cases not) . I  
had cases (on HP-UX, where you use shl_load() because there's no  
dlopen() in this OS) where I had to examine errno (and on other OSes,  
where available, with dlerror() ...) to find out what really happened.

Thanks again - having talked/written that much now I figure I should  
start supporting you and begin coding that stuff... Will look for the  
source code.

Frank

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