dlopenclose.bt

struct link_map {
    char _other[8];
    char *l_name;
    char _other2[776];
    unsigned l_direct_opencount;
};
uprobe:/usr/lib/x86_64-linux-gnu/libc.so.6:dlopen {
    @enter[tid] = arg0;
}
uretprobe:/usr/lib/x86_64-linux-gnu/libc.so.6:dlopen {
    $count = retval == 0 ? 0 : ((struct link_map*)retval)->l_direct_opencount;
    printf("[%d:%d] opening %s result %p c_after:%u\n", pid, tid, str(@enter[tid]), retval, $count);
    printf("%s", ustack(3))
}
uprobe:/usr/lib/x86_64-linux-gnu/libc.so.6:dlclose {
    $lm = (struct link_map*)reg("di");
    printf("[%d:%d] closing on %p c_before:%u %s\n", pid, tid, arg0, $lm->l_direct_opencount, str($lm->l_name));
    printf("%s", ustack(3))
}