在使用Mono运行的C＃应用程序中更改当前的Linux用户？

I am developing a library (CLI assembly) for a Linux system. I want to provide a method for users of the library to switch the current effective user and group. The primary reason is to provide access control (certain actions only allowed by certain users), and secondarily to enable modification of file system as a certain user.I am developing a library (CLI assembly) for a