Re: Issues with dlopen and compile of modules...

[Chris Bowlby]

At 02:34 AM 10/22/2004, Ralf Wildenhues wrote:

Hi All,

  Ok, based on the recommendations from Ralf, I've been able to move 
forward some. I've got her compiling now and the only issue remaining is 
that the dlopen function is not finding the symbol I need it to look for, 
the new code looks like:

#include <dlfcn.h>
#include <stdlib.h>
#include <unistd.h>
#include <iostream>

void main(void) {
 void (*test_function) (int &);
 void *handle =  NULL;

 handle = dlopen("libtest/libtest.so", RTLD_NOW);
 if (!handle) {
  cerr << dlerror() << "\n";
  exit(EXIT_FAILURE);
 }

 test_function = (void (*)(int&))dlsym(handle, "test_fun");
 if (!test_function) {
   cerr << dlerror() << "\n";
   exit(EXIT_FAILURE);
 }

 test_function(1);

 dlclose(handle);
}

When I execute the command I get:

> ./test_call
Undefined symbol "test_fun"

Yet it's defined in the library and compiled in as far as I can tell..

Is there something I need in the library end of things? all it looks like 
right now is:

#include <iostream>

void test_fun(int &number) {
 cout << number << "\n";
}