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Full Discussion: Monitor a script
Top Forums UNIX for Dummies Questions & Answers Monitor a script Post 302765261 by gary_w on Friday 1st of February 2013 05:18:37 PM
Old 02-01-2013
Here ya go. Checks every CHECK_TIME seconds to see if the background process has finished or if the WAIT_TIME value has been reached. Test by changing the BACKGROUND_TIME and WAIT_TIME values:
Code:
$ cat timeout

#!/bin/ksh

##
##  timeout example
##

integer BACKGROUND_TIME=10  # Seconds the background process will run to simulate
                            #  a long-running process.
integer WAIT_TIME=30        # Max seconds the main program will wait for the background process.
                            #  For an hour, use 3600.
integer CHECK_TIME=2        # Seconds between checking to see if the process finished.
integer elapsed_time=0          # Total time we have waited.

##
##  Function to start the background process.
##
f_background_command() {
  print "  START - background_command, sleeping $BACKGROUND_TIME seconds..."
  sleep $BACKGROUND_TIME
  print "  \nEND - background_command"
}

##
##  Main
##
print "START"

## Start the background process...
f_background_command &

## And capture its PID.
background_PID=$!

print "background process PID is $background_PID"

print "Waiting for $WAIT_TIME seconds or until the process completes..."

## Wait until the background process finishes, or the timeout
##  has been reached.
while :
do
  sleep $CHECK_TIME

  if [[ ! -d "/proc/$background_PID" ]]; then
    print "Background process completed before WAIT_TIME reached."
    break
  fi
  if (( $elapsed_time > $WAIT_TIME )); then
    print "\nTimeout reached."
    kill $background_PID 2>/dev/null  ## kill -9 could be dangerous!
    print "kill signal sent to PID $background_PID"
    break
  fi

  (( elapsed_time = $elapsed_time + $CHECK_TIME ))

  printf "\rElapsed seconds: %d " $elapsed_time
done

print "\nEND"

exit 0

Sample run with BACKGROUND_TIME < WAIT_TIME (Background process finishes before TIMEOUT):
Code:
$  timeout
START
background process PID is 8048
Waiting for 30 seconds or until the process completes...
  START - background_command, sleeping 10 seconds...
Elapsed seconds: 8
   END - background_command
Background process completed before WAIT_TIME reached.

END
$

Sample run with BACKGROUND_TIME > WAIT_TIME (force a timeout):
Code:
$ timeout
START
background process PID is 8186
Waiting for 10 seconds or until the process completes...
  START - background_command, sleeping 30 seconds...
Elapsed seconds: 12
Timeout reached.
kill signal sent to PID 8186

END
$

Make sure your background process properly handles being killed so you don't end up with zombie processes, corrupted files, etc.
 

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LEARN ABOUT DEBIAN

msvc

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

NAME

       msvc - control minit

SYNOPSIS

       msvc [ -[uodpchaitko] ] [ -P pid ] service [...]

DESCRIPTION

       msvc  is the management interface to minit.  service is the service directory name relative to /etc/minit.  Starting with minit 0.9 you can
       also include /etc/minit/ in the service name.

OPTIONS

       If no option is given, msvc will just print a small diagnostic message to stdout, saying if the service is up, down or finished, which  PID
       it has if it is up, and for how long it has been in this state.

       -u   Up.  If the service is not running, start it.  If the service stops, restart it.

       -o   Once.  If the service is not running, start it.  If the service stops, do not restart it.

       -d   Down.  If the service is running, send it a TERM signal and then a CONT signal.  After it stops, do not restart it.

       -p   Pause.  Send the service a STOP signal.

       -c   Continue.  Send the service a CONT signal.

       -h   Hangup.  Send the service a HUP signal.

       -a   Alarm.  Send the service an ALRM signal.

       -i   Interrupt.	Send the service an INT signal.

       -t   Terminate.	Send the service a TERM signal.

       -k   Terminate.	Send the service a KILL signal.

       -P pid
	    Set PID.  Tell minit the PID of the service is really pid.	This is useful for services that fork themselves in the background but put
	    their real PID in a file, typically called /var/run/service.pid.  Used by pidfilehack.

       -D service
	    Print dependencies.  This will print all the names of all the services that were started  because  this  services  depended  on  them.
	    Please  note  that this is not done recursively (i.e. if default depends on qmail and qmail depends on log, this will print qmail, not
	    qmail/log.	But msvc -D qmail will print qmail/log).

       -H   Print history.  This will print the names of the ten least recently spawned processes.  This is useful if you see  a  process  looping
	    (initialization fails and minit is restarting it all the time).

RETURN CODES

       Generally,  msvc  return zero if everything is OK or 1 on error (could not open /lib/minit/in or /lib/minit/out or there is no process with
       the given name).  In diagnostic mode, it will exit 0 if the service is up, 2 if it is down or 3 if it is finished.

SEE ALSO

       pidfilehack(8), svc(8)

																	   msvc(8)
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