## Function: SB-ALIEN::ALIEN-CALLBACK-P
[![package](https://img.shields.io/badge/Package-SB--ALIEN-5f9ea0.svg?style=social&colorA=999999)](../) [![type](https://img.shields.io/badge/Type-Function-5f9ea0.svg?style=social&colorA=999999)](../#function) [![github](https://img.shields.io/badge/GitHub-View_the_source-5f9ea0.svg?style=social&colorA=999999&logo=github)](https://github.com/sbcl/sbcl/blob/master/src/code/alien-callback.lisp/) 

> Returns true if the alien is associated with a lisp-side callback,
> and a secondary return value of true if the callback is still valid.

### Lambda list
```cl
(sb-alien:alien)
```