CODEWITHSUNDEEP
cshared-libraries
KallDrexx
KallDrexx

Reputation: 27813

dlopen not finding library that ldconfig -p finds

I'm trying to bind against the CUDA library shared. As a quick verification I wrote the following code:

#include <stdlib.h>
#include <stdio.h>
#include <dlfcn.h>

int main(int argc, char **argv) {
    void *handle;    
    handle = dlopen ("libcuda.so", RTLD_LAZY);
    if (!handle) {
        fputs (dlerror(), stderr);
        exit(1);
    }

    dlclose(handle);
}

This fails with libcuda.so: cannot open shared object file: No such file or directory.

However, if I check ldconfig I get:

ldconfig -p | grep libcuda
        libcuda.so.1 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libcuda.so.1
        libcuda.so.1 (libc6) => /usr/lib/i386-linux-gnu/libcuda.so.1
        libcuda.so (libc6) => /usr/lib/i386-linux-gnu/libcuda.so

So it seems that libcuda.so does exist and is seen by the system. So why is dlopen() failing?

This is on Ubuntu 14.04.

Upvotes: 1

Views: 634

Answers (1)

Iharob Al Asimi
Iharob Al Asimi

Reputation: 53006

I can see from your ldconfig -p that there is no symlink for libcuda.so.1 x86_64, you just need to create it, try

sudo ln -svf /usr/lib/x86_64-linux-gnu/libcuda.so{.1,}

it might be the case that you don't have the -dev package installed.

Or simply change

handle = dlopen ("libcuda.so", RTLD_LAZY);

to

handle = dlopen ("libcuda.so.1", RTLD_LAZY);

but the first solution is better because when you link dynamically to libcuda.so.1 with -lcuda the symlink migh be mandatory.

Upvotes: 1

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