downtimed man page on DragonFly
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DOWNTIMED(8) DOWNTIMED(8)
NAME
downtimed - system downtime monitoring and reporting daemon
SYNOPSIS
downtimed [-D] [-d datadir] [-f timefmt] [-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 data‐
base.
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
compile time.
-f timefmt
Specify the time and date format to use when reporting using
strftime(3) syntax. The default is "%F %T".
-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 cre‐
ated 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
determined 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 reli‐
able.
-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 each 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 sys‐
tem 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 operating
system, it assumes that the system started when the daemon started.
Reporting is inaccurate if the system clock changes during system down‐
time or startup process. Daylight saving time changes have no effect as
all calculations are done using UTC.
COPYRIGHT
Copyright © 2009-2013 EPIPE Communications. All rights reserved.
Redistribution and use in source and binary forms, with or without mod‐
ification, 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 PUR‐
POSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSI‐
NESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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 representing
official policies, either expressed or implied, of EPIPE Communica‐
tions.
version 0.6 2013-07-27 DOWNTIMED(8)
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