根据函数地址查找函数名称，或根据函数名称查找函数地址的实现

linux平台上查问题时，定位到出错的函数地址，但无法知道是哪个模块的函数，记录如下函数可实现：

int getFuncAddrByName(char *funcName, unsigned int nameLen)
{
    void *handle = NULL;
    void *iptr = NULL;

    /* open the needed object */
    handle = dlopen(NULL, RTLD_LOCAL | RTLD_LAZY);
    if(handle == NULL)
    {
        return NULL;
    }

    /* find the address of function and data objects */
    iptr = dlsym(handle, funcName);
    dlclose(handle);
    
    if(iptr == NULL)
    {
        return NULL;
    }

    return (int)iptr;
}


int getFuncNameByAddr (FUNCPTR funcAddr, char *funcName, unsigned int funcNameLen)
{
    void *handle = NULL;
    Dl_info dl;
    int ret = 0;

    /* open the needed object */
    handle = dlopen(NULL, RTLD_LOCAL | RTLD_LAZY);
    if(handle == NULL)
    {
        return -1;
    }

    /* find the address of function and data objects */
    ret = dladdr (funcAddr, &dl);
    dlclose(handle);
    
    if(ret == 0)
    {
        return -1;
    }
    
    strncpy(funcName, dl.dli_sname, funcNameLen - 1);
    
    return 0;
}