This routine displays information on a file system such as its type,
the amount of disk space occupied, the total disk space and the number
of inodes.

It tries C<syscall(SYS_statfs)> and C<syscall(SYS_statvfs)> in several
ways. If all fails, it C<croak>s.

WWW: https://metacpan.org/release/Filesys-DiskSpace