How is system() function of stdlib.h file implemented in linux? [duplicate]

This question already has answers here: 开发者_运维知识库 Closed 11 years ago.

Possible Duplicate:

How does system() exactly work in linux?

For the sake of my curiosity, I want to know that how does system() function spawn the process and its internal implemenation ? Is is using fork , exec internally ?

---

On my Debian box it uses clone() that itself calls sys_clone(). You can use strace to look at system calls.