On Nov 8, 2005, at 2:39 PM, Bob Copeland wrote:
Isn't this just because the device size is > 2**32? What if you
use fseeko(3)
and #define _FILE_OFFSET_BITS 64?
Yep. I got it to return the correct hard disk size (17Gb) using
lseek64 and
#define _LARGEFILE64_SOURCE
#define _FILE_OFFSET_BITS 64
Here is what I did
-------------------------------------------------
#define _LARGEFILE64_SOURCE
#define _FILE_OFFSET_BITS 64
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
int main()
{
int f;
off64_t off=0;
f = open("/dev/hda", O_RDONLY );
if(f <= 0){
perror("open");
exit(0);
}
off = lseek64(f, 0, SEEK_SET);
off = lseek64(f, 0, SEEK_END);
perror("llseek");
printf ("Size %lld\n", off);
close(f);
return 0;
}
Okay, still not portable and there is probably a better way that
doesn't rely
on such nonsense. For example, since you have a minimum size in mind,
just seek that much and see if it works - you don't really need to
know the
whole disk size for that. Or figure out the best way on all of
your platforms
and abstract it.
Now this gives me a clue what Ted was referring to as binary search
in e2fsprogs.
If nothing works this should work portably I guess.
Thanks
Parag
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