[ale] system interface for df info?

[Christopher Fowler]

df gets its information using statfs()

        statfs("/", &buf);

        bsize = buf.f_bsize;
        printf("\tTotal Bytes:   %10lu Kb\n", (buf.f_blocks * bsize) /
1024);
        printf("\tUsed Bytes:    %10lu Kb\n", ((buf.f_blocks -
buf.f_bfree) * bsize) / 1024);
        printf("\tFree Bytes:    %10lu Kb\n", (buf.f_bfree * bsize) /
1024);


Thats how I do it on our embedded device.


On Wed, 2006-01-18 at 05:53 -0500, Jim wrote:
> Ah, good old strace.  Thanks for reminding me of a useful tool.
> 
> Jim.
> Joe Steele wrote:
> 
> >An easy way to find out:
> >strace df 2>&1 | less
> >
> >You'll see that it opens /etc/mtab, and then performs an statfs64() on 
> >each mounted filesystem found there.
> >
> >--Joe
> >
> >Jim wrote:
> >  
> >
> >>Where does df get its information?  I'd like to programatically  get the 
> >>same info without calling df.  I've looked at /proc but nothing jumped 
> >>out.  Obviously, df doesn't add up all the files to get "used" space, 
> >>'cause it doesn't take that long.
> >>    
> >>
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> >
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> >
> >  
> >
> 
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