#define _GNU_SOURCE
//#define __BSD_VISIBLE

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <dlfcn.h>
#include <stdio.h>
#include <unistd.h>


#define LIBCPATH "/lib64/libc.so.6"

 
int (*next_open64)(const char *pathname, int flags, mode_t mode) = NULL;

int main(void)
{
    char *msg;
    int fd;
    next_open64=dlvsym(RTLD_NEXT, "open64","GLIBC_2.2.5");
    fprintf(stderr,"dlvsym(open64): %p\n",*(next_open64));
    if ( (msg = dlerror()) != NULL)
	fprintf (stderr, "dlvsym(%s): %s\n", "open64", msg);
    fd = next_open64("/etc/inittab", O_RDONLY, 0);
    close(fd);
    next_open64=dlsym(RTLD_NEXT, "open64");
    if ( (msg = dlerror()) != NULL)
	fprintf (stderr, "dlsym(%s): %s\n", "open64", msg);
    fprintf(stderr,"dlsym(open64): %p\n",*(next_open64));
    fd = next_open64("/etc/inittab", O_RDONLY, 0);
    return 0;
}