dlopen, dlsym

gistfile1.c

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

void ppp()
{
}
int main(int argc, const char * argv[])
{

    
    void *h = dlopen(NULL, RTLD_NOW);
    printf("%p\n",h);
    printf("ppp:%p\n",ppp);
    printf("search:%p\n",dlsym(RTLD_DEFAULT, "ppp"));
    printf("dlopen(null):%p\n",dlsym(h, "ppp"));
    return 0;
}