/* load the math library, and print the cosine of 2.0: */
/* compile with gcc -rdynamic -o foo foo.c -ldl */

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

int main(int argc, char **argv)
{
	void *handle;
	double (*cosine)(double);
	char *error;
	
	handle=dlopen ("/lib/libm.so.5", RTLD_LAZY);
	if (!handle) 
	{
		fputs(dlerror(),stderr); 
		exit(1);
	}
	
	cosine=dlsym(handle, "cos");
	if ((error = dlerror()) != NULL)
	{
		fputs(error, stderr);
		exit(1);
	}
	printf ("%f\n", (*cosine)(2.0));
	dlclose(handle);
	return 0;
}