On Thu, 2003-10-23 at 19:20, Michael Hipp wrote:
> Anyone know a simple call from c that will give the free space available
> on a volume (e.g. /dev/hda1)?
I use the following in a program. It wants to know about free space on
the disk where a data file is, as that is what we are interested in. It
should be enough to get you started. It works on SVR4/5 and Linux. The
comments are just what was there.
int DiskFreeSpace()
{
struct statvfs fsbuf;
// We use the name of the .set file, which always exists, and is
// always on the same file system as all the other files created.
// As the set file is not open, we use statvfs() to find out about
// the file system on which the set file is being written.
if (statvfs(set_name, &fsbuf) == ISERROR) return(0);
// We use f_bavail to determine how many blocks are available.
// f_bavail tells the # of free blocks available to non-superusers.
//
// As we want to return kilobytes free, f_bavail is divided by
// f_frsize, which is the fndamental block size. This may be more
// or less than 1024. As we want to stick with integer math, we do
// a test for this so we can perform proper math.
if (fsbuf.f_frsize < 1024) {
return(fsbuf.f_bavail / (1024 / fsbuf.f_frsize));
} else {
return(fsbuf.f_bavail * (fsbuf.f_frsize / 1024));
}
}
>
> Thanks,
> Michael
>
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