Finding diskspace status programatically.

[Dave Decot]

> AT&T UNIX System V Programmer's Reference Manual, statfs(2):
> 
> "statfs obsoletes ustat and should be used in preference to it in new
> programs."
> 
> Much better all round.

Except that if you want to port it to BSD, you'll find your program
failing in mysterious and wonderful ways, because although a function of the
same name is present, the number and types of the arguments are different.

Good going, folks.

Dave