Wine and LD_PRELOAD

[Lionel Tricon]

On Sunday 18 November 2007 20:14:41 Stefan Dösinger wrote:
> I think wine dlopen()s many libraries instead of linking dynamically to
> them. This makes the build environment more independent of the runtime
> environment, and we can provide binary builds with all features enabled,
> and they will still run if the user's system does not have all the libs.

Hi Stefan,
Thanks for your reply.

> We had an issue like that with libGL.so a long time back, and it was fixed
> by changing some parameter to dlopen. Does anyone remember what that was,
> and if this can be done for the other libraries too?
>
> Lionel, can you provide us with a list of libraries where LD_PRELOAD does
> not work correctly? This should help to track down the bad ldopen calls.

In fact, we overload a lot of common system call from the standard libc. We 
have slightly modified the fackechroot library and we need to trap almost all 
system calls linked to the filesystem. To give you an idea, all the following 
system calls are reimplemented so that we can put the software into a jail 
(in most of them, we only change the local path before calling the real one).

As far as i understand the problem (and with the help of strace), it appears 
that the wine application ignore the LD_PRELOAD env var (LD_PRELOAD instructs 
the loader to load additional libraries into a program). I suppose that wine 
use its own internal mechanisme which is not compatible with the LD_PRELOAD 
one.

So, if you have some ideas ...

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