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//usr/share/doc/perl-Filesys-Df-0.92/README

INSTALL
TO INSTALL RUN:
                                                                                                                     
        perl Makefile.PL
        make
        make test
        make install

During the build process, the makefile will try to figure out which
system calls to use to obtain filesystem information. It will look
for statvfs() first via the Config module and a include directory
search. If it locates statvfs(), it will assume the system also has
fstatvfs(). If it cannot find statvfs(), it will then begin the same
search for statfs(). If statfs() is found it will assume fstatfs()
is also available.

During the 'make test', test.pl will try to test with '/' and then
open test.pl in the current directory and use that for a filehandle
test.

Once installed, run 'perldoc Filesys::Df' for more information.

If you have any problems or questions please email me at IGuthrie@aol.com
with "Filesys::Df" in the subject line. If you run into a build problem,
please include the output of the install commands, the version of Perl
you are using (perl -v), and what operating system you are using.

Module Documentation:
This distribution contains the module Filesys::Df

Filesys::Df - Perl extension for filesystem disk space information.

SYNOPSIS

use Filesys::Df;

#### Get information by passing a scalar directory/filename value
  my $ref = df("/tmp");  # Default output is 1K blocks
  if(defined($ref)) {
     print "Total 1k blocks: $ref->{blocks}\n";
     print "Total 1k blocks free: $ref->{bfree}\n";
     print "Total 1k blocks avail to me: $ref->{bavail}\n";
     print "Total 1k blocks used: $ref->{used}\n";
     print "Percent full: $ref->{per}\n";

if(exists($ref->{files})) {
        print "Total inodes: $ref->{files}\n"; 
        print "Total inodes free: $ref->{ffree}\n"; 
	print "Inode percent full: $ref->{fper}\n";
     }
  }

#### Get information by passing a filehandle
  open(FILE, "some_file");  # Get information for filesystem at "some_file"
  my $ref = df(\*FILE);  
  #### or
  my $ref = df(*FILE);  
  #### or
  my $fhref = \*FILE;
  my $ref = df($fhref);

#### Get information in other than 1k blocks
  my $ref = df("/tmp", 8192);  # output is 8K blocks
  my $ref = df("/tmp", 1);     # output is bytes

DESCRIPTION

This module provides a way to obtain filesystem disk space
information. This is a Unix only distribution. If you want to
gather this information for Unix and Windows, use Filesys::DfPortable.
The only major benefit of using Filesys::Df over Filesys::DfPortable,
is that Filesys::Df supports the use of open filehandles as arguments.
                                                                                                                       
The module should work with all flavors of Unix that implement the
statvfs() and fstatvfs() calls, or the statfs() and fstatfs() calls.
This would include Linux, *BSD, HP-UX, AIX, Solaris, Mac OS X, Irix,
Cygwin, etc ...
                                                                                                                       
df() requires a argument that represents the filesystem you want to
query. The argument can be either a scalar directory/file name or a
open filehandle. There is also an optional block size argument so
you can tailor the size of the values returned. The default block
size is 1024. This will cause the function to return the values in 1k
blocks. If you want bytes, set the block size to 1.

df() returns a reference to a hash. The keys available in 
the hash are as follows:

{blocks} = Total blocks on the filesystem.

{bfree} = Total blocks free on the filesystem.

{bavail} = Total blocks available to the user executing the Perl 
application. This can be different than bfree if you have per-user 
quotas on the filesystem, or if the super user has a reserved amount.
{bavail} can also be a negative value because of this. For instance
if there is more space being used then you have available to you.

{used} = Total blocks used on the filesystem.

{per} = Percent of disk space used. This is based on the disk space
available to the user executing the application. In other words, if
the filesystem has 10% of its space reserved for the superuser, then
the percent used can go up to 110%.

You can obtain inode information through the module as well. But you
must call exists() on the {files} key to make sure the information is
available:
if(exists($ref->{files})) {
        #### Inode info is available
}
Some filesystems may not return inode information, for
example some NFS filesystems.

Here are the available inode keys:

{files} = Total inodes on the filesystem.

{ffree} = Total inodes free on the filesystem.

{favail} = Total inodes available to the user executing the application.
See the rules for the {bavail} key.

{fused} = Total inodes used on the filesystem.

{fper} = Percent of inodes used on the filesystem. See rules for the {per}
key.

There are some undocumented keys that are defined to maintain backwards
compatibility: {su_blocks}, {user_blocks}, etc ...

If the df() call fails for any reason, it will return
undef. This will probably happen if you do anything crazy like try
to get information for /proc, or if you pass an invalid filesystem name,
or if there is an internal error. df() will croak() if you pass
it a undefined value.

Requirements:
Your system must contain statvfs() and fstatvfs(), or statfs() and fstatfs()
You must be running Perl 5.6 or higher.
                                                                                                                     
Copyright (c) 2006 Ian Guthrie. All rights reserved.
               This program is free software; you can redistribute it and/or
               modify it under the same terms as Perl itself.