Le 29 janv. 2010 à 16:58, Richard Penwell a écrit :
> Dear list,
>
> I've been toying around with some problems in the world of dynamic code
> loading... (a vast and mythical place). I understand that there is a
> fundamental difference between Mach-O executables and Mach-O dynamic
> libraries (beyond the obvious Mach-O filetype header). I assume it has to do
> with a concept I've read about known as Position Independent Code, in that
> Dynamic Libraries are PIC and executables (assuming that they are the first
> object to load and therefore could not have to content for a VM address
> range) are not. The question goes something like this:
>
> Given I have a Mach-O executable file that contains a symbol that I wish to
> be able to call is there any way to use dlopen or NSBundle load to bring
> those symbols into another executable?
>
> I have attempted the following two methods:
>
> NSBundle *applicationBundle = [[NSBundle alloc]
> initWithFile:@"path/to/mach-o/executable"];
> [applicationBundle load]
>
> The above results in:
> 2010-01-29 10:07:41.812 LoadPagesDynamically[93324:a0f] Attempt to load
> executable of a type that cannot be dynamically loaded for CFBundle
> 0x1001161b0 <path/to/mach-o/executable> (executable, not loaded)
>
> Also:
>
> void* pages_application = dlopen("path/to/mach-o/executable", RTLD_NOW);
>
> The above results in pages_application == NULL with no errors being reported.
>
> If it is not possible (I suspect not), is it possible to convert executable
> object code to a PIC representation to be dynamically loaded?
>
> I imagine that there may be something that I don't know given Apple's history
> of binary magic (fat binaries, rosetta etc).
>
> It seems that this is a dark corner of the DYLD system that isn't well
> documented as to the technical aspects of why this isn't done.
>
> I've tried to be as detailed as possible, but if you would like more
> information as to what I've tried, please let me know.
>
> Thanks,
> Richard
If you have a dylib question, ask on the darwin-...@lists.apple.com . This is
where dylib specialists are.
-- Jean-Daniel
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