How can I know which files a proccess is accessing?

[Clint Olsen]

On Jun 06, Eduardo Meyer wrote:
> I need to know which files under /var a proccess (httpd here) is
> acessing. It is not logs because I have a different partition for
> logs.
> 
> gstat tells me that slice ad0s1h (my /var) is 100% frequently, and in
> fact with fstat I can see a number of httpd proccesses running
> accesing that. But fstat only shows me inodes and the mount point.
> 
> I need to know which files the proccesses are acessing.

Linux has a cool program: lsof (list open files).  Does FreeBSD have
something similar?

-Clint