DOWNTIMED(8)						      System Manager's Manual						      DOWNTIMED(8)

NAME

       downtimed - system downtime monitoring and reporting daemon

SYNOPSIS

       downtimed [-D] [-d datadir] [-l log] [-p pidfile] [-S] [-s sleep]
       downtimed -v

DESCRIPTION

       The  downtimed  daemon  waits  in  the background, frequently updating a time stamp file on the disk. If the daemon is killed with a signal
       associated with a normal system shutdown procedure, it will record the shutdown time on the disk.

       When the daemon is restarted during the next boot process, it will report how long the system was down and whether  it  was  properly  shut
       down  or  crashed.  The	downtime  report is output to the system log or to a specified log file. Also a record is appended to the downtime
       database.

OPTIONS

       -D     Do not create nor update the downtime database.

       -d datadir
	      The directory where the time stamp files as well as the downtime database are located. The default directory is determined  at  com-
	      pile time.

       -l log Logging  destination.  If the argument contains a slash (/) it is interpreted to be a path name to a log file, which will be created
	      if it does not exist already. Otherwise it is interpreted as a syslog facility name. The default	logging  destination  is  "daemon"
	      which means that the messages are written to syslog with the daemon facility code.

       -p pidfile
	      The  location  of  the file which keeps track of the process ID of the running daemon process. The system default location is deter-
	      mined at compile time.

       -S     Normally fsync(2) is performed after each update of the time stamp. This option disables the fsync(2).  It reduces the load  on  the
	      disk system but makes the downtime measurement less reliable. This option is not available on all systems.

       -s sleep
	      Defines how long to sleep between each update of the on-disk time stamp file. More frequent updates result in more accurate downtime
	      reporting in the case of a system crash. Less frequent updates decrease the amount of disk writes performed. The default is to sleep
	      15  seconds  between  eacch update. If you are using a flash memory based SSD or other disk which has limited amount of write cycles
	      per block, it might be a good idea to set the sleep time to a higher value to prolong the lifetime of the storage device.

       -v     Display the program version number, copyright message and the default settings.

SIGNALS

       SIGHUP Close and re-open the output log. Use in case you want to rotate the log file.

       SIGTERM and SIGINT
	      Terminate gracefully. These signals signify that a graceful system shutdown is in process.

EXIT STATUS

       The daemon exits 0 on success, and >0 if an error occurs.

SEE ALSO

       downtimes(1), syslog.conf(5), http://dist.epipe.com/downtimed/

BUGS

       The reporting accuracy in case of a system crash depends on how often the time stamp is updated.

       Finding out the system startup time is very operating system specific.  If the program does not have specific code to support your  operat-
       ing system, it assumes that the system started when the daemon started.

       Reporting  is inaccurate if the system clock changes during system downtime or startup process. Daylight saving time changes have no effect
       as all calculations are done using UTC.

COPYRIGHT

       Copyright (C) 2009-2011 EPIPE Communications. All rights reserved.

       Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following  conditions  are
       met:

       1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

       2.  Redistributions  in	binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the
       documentation and/or other materials provided with the distribution.

       THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT  NOT  LIMITED  TO,
       THE  IMPLIED  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBU-
       TORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,  PROCURE-
       MENT  OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABIL-
       ITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
       EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

       The  views and conclusions contained in the software and documentation are those of the authors and should not be interpreted as represent-
       ing official policies, either expressed or implied, of EPIPE Communications.

version 0.5							    2011-03-02							      DOWNTIMED(8)