int dl_iterate_phdr(int(*callback)(struct dl_phdr_info *info, size_t size, void *data), void *data)
{   
    struct dso *current;
    Ehdr *ehdr;
    struct dl_phdr_info info;
    int ret = 0;
    for(current = head; current; current = current->next) {
        ehdr = (Ehdr *)current->map;
        info.dlpi_addr = (ehdr->e_type == ET_EXEC) ? 0 : current->map;
        info.dlpi_name = current->shortname;
        info.dlpi_phdr = (Phdr *)(current->map + ehdr->e_phoff);
        info.dlpi_phnum = ehdr->e_phnum;

        ret = (callback)(&info, sizeof (info), data);
        if (ret != 0)
            break;
    }
    return ret;
}