How to use ffi.verfiy() to open a shared library?
I tried a C code by using dlopen, but met the same errors.
void *handle;
handle = dlopen("./_distcache.so", RTLD_LAZY);
if (!handle) {
fprintf(stderr, "%s\n", dlerror());
exit(EXIT_FAILURE);
}
With C code, it also reported that " undefined symbol:
_ZTIN6apsara13ExceptionBaseE".
On Wed, Jul 8, 2015 at 5:18 PM, Armin Rigo <ar...@tunes.org> wrote:
> Hi Maciej,
>
> On 8 July 2015 at 11:14, Maciej Fijalkowski <fij...@gmail.com> wrote:
> > you should probably use verify instead of dlopen. This symbol is
> > likely defined in libstdc++, which is not loaded in pypy (you might
> > try to load it by hand, but I'm way out of my depth here)
>
> http://demangler.com/ says the symbol is apsara::ExceptionBase, which
> doesn't look like it comes from libstdc++. That's about all I can say
> though. The point is that "./_distcache.so" looks like it is missing
> this symbol and can't be loaded (independently of cffi --- try to load
> it for example in a small C program that calls dlopen()).
>
> Obviously I agree with Maciej's comment and you should use verify()
> instead of dlopen(), particularly if _distcache.so is full of C++
> names, because these can't be cleanly accessed with dlopen().
>
>
> Armin
>
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