== Synopsis
   require 'sys/uptime'
   include Sys

   p Uptime.days
   p Uptime.hours
   p Uptime.minutes
   p Uptime.seconds
   p Uptime.dhms.join(', ')
   p Uptime.uptime
   p Uptime.boot_time

== Description
   This package provides uptime and boot time information, similar to the
   'uptime' Unix command.
    
== Constants
VERSION
   Returns the current version number of this package (as a string).
    
== Class Methods
Uptime.boot_time
   Returns the boot time as a Time object.
    
Uptime.days
   Returns the total number of days the system has been up.
    
Uptime.hours
   Returns the total number of hours the system has been up.
    
Uptime.minutes
   Returns the total number of minutes the system has been up.
    
Uptime.seconds
   Returns the total number of seconds the system has been up.
    
Uptime.dhms
   Calculates and returns the number of days, hours, minutes and
   seconds the system has been running as a four-element Array.
    
Uptime.uptime
   Calculates and returns the number of days, hours, minutes and
   seconds the system has been running as a colon-separated string.
    
== Exceptions
UptimeError
   Raised if something goes wrong.  On Unix, this would likely mean a
   failure of the times() function.  On Windows, it probably means you
   failed to connect to WMI properly.
    
== Notes
   On MS Windows each of the class methods optionally takes a host name as
   a single argument. The default is localhost (or whatever the result of
   Socket.gethostname returns).

   The current time, users and load average are NOT included in this
   module, even though you may be used to seeing them with the command
   line version of 'uptime'.  This is because these things have
   _absolutely nothing_ to do with uptime (at least, not as I
   logically think of uptime).
    
   This package was tested successfully on a Solaris system with over 1600
   days of uptime.
    
== Known Bugs
   None that I am aware of.  Please log any bugs you find on the project
   website at http://www.rubyforge.org/projects/sysutils.

== Questions
   "Doesn't Struct::Tms do this?" - No.
    
== License
   Ruby's
    
== Copyright
   Copyright 2002-2006, Daniel J. Berger

   All Rights Reserved. This module is free software. It may be used,
   redistributed and/or modified under the same terms as Ruby itself.
    
== Warranty
   This package is provided "as is" and without any express or
   implied warranties, including, without limitation, the implied
   warranties of merchantability and fitness for a particular purpose.

== Acknowledgements
   Mike Hall for help with the BSD side of things.
   Ola Eriksson, whose source code I shamelessly plagiarized to get a better
   implementation for systems that have the utmpx.h header file.

== Author
   Daniel J. Berger
   djberg96 at gmail dot com
   imperator on IRC (Freenode)
    
== See Also
   uptime