Shelling df

dsheller · 06-19-2004, 06:03 PM

Basically I want to be able to shell df and get what it returns from a cpp app, if there is an easier way to do that I am all ears.

aluser · 06-19-2004, 07:05 PM

It looks like the way df works is via statfs(2). I would go this route.

If you still decide to parse the output of df, you probably want popen(3) to get its output. For more direct control, you could duplicate popen()'s functionality with fork(2), pipe(2), dup2(2), and execl(3).

dsheller · 06-20-2004, 12:17 PM

Thanks that works great! I got it to stuff all the info in a vector and its working fine.

aluser · 06-20-2004, 12:37 PM

excellent

for future reference, I figured the statfs() call out by doing "strace df". strace lists all the system calls a program makes, and their arguments. It's great for figuring out "how do I programmatically do what this unix utility is doing?"

dsheller · 06-20-2004, 06:23 PM

Ooh, thanks that will come in handy I am sure one day.