On Tue, 5 Mar 2013, Jose Fonseca wrote:
> $LIB is a neat idea. But does it work on debian/ubuntu systems, where
> mesa/NVIDIA libGL.so are put in different paths , which are then chosen via
> /etc/ld.so.conf*?
I think Debian installs a symlink to the active libGL in /usr/lib. Not sure
about Ubuntu; it's painful in other ways, e.g. until 13.04 their loader
expanded $LIB differently so it needed /usr/lib/$LIB. However, the point
seems moot as ...
> But of course, "apitrace trace" could easily just do dlopen("libGL.so.1")
> and fill TRACE_LIBGL env var with it.
... this looks like a better approach anyhow.
> There is no guarantee that when we do
>
> real_dlsym = dlsym(dlopen("libdl.so.2"), "dlsym")
>
> that a fake_dlsym or a fake_dlopen doesn't return itself. But I suppose it
> can't hurt.
Yes, VirtualGL may inject a dlopen interposer capable of doing just that, but
at least that's avoidable. It also makes efforts to prevent mutual recursion.
Alexander
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