K 10
svn:author
V 6
alfred
K 8
svn:date
V 27
2013-01-19T06:04:26.701078Z
K 7
svn:log
V 1286
Add code to watchdog to time the watchdog command program, carp when the program takes too long.

The purpose of this is to allow system integrators to tune their watchdogs and
get advanced notice if they are behaving poorly.

The following facilities are added:
   - Warn if the watchdog program takes too long.
   - Disable activation of the system watchdog so that one can test the watchdogd script
     without potentially rebooting the system.
   - Ability to log to syslog when scripts begin to timeout.

The following changes are included:
   - When told to measure time, do not unconditionally nap for 'sleep' seconds, instead adjust
     the naptime by the elapsed time so as not to trigger the watchdog.

Example:

/usr/trees/head/usr.sbin/watchdogd # ./watchdogd -d -n -w -e "sleep 1"
watchdogd: mlockall failed: Cannot allocate memory
watchdogd: Watchdog program: 'sleep 1' took too long: 1.010894 seconds >= 1 seconds threshhold
watchdogd: Watchdog program: 'sleep 1' took too long: 1.010636 seconds >= 1 seconds threshhold
watchdogd: Watchdog program: 'sleep 1' took too long: 1.010700 seconds >= 1 seconds threshhold
^C

/usr/trees/head/usr.sbin/watchdogd # ./watchdogd -d -n -w -e "sleep 0.9"
watchdogd: mlockall failed: Cannot allocate memory

... doesn't complain ...

END