Monitor a script Post: 302763157

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Top Forums UNIX for Dummies Questions & Answers Monitor a script Post 302763157 by gary_w on Tuesday 29th of January 2013 03:42:13 PM

01-29-2013

Registered User

This example should give you some ideas:

Code:

$ cat timeout
#!/bin/ksh

##
##  timeout example
##

BACKGROUND_TIME=30  # Seconds the background process will run to simulate
                    #  a long-running process.
WAIT_TIME=20        # Seconds the main program will wait for the background process.
                    #  For an hour, use 3600.

##
##  Function to start the background process.
##
f_background_command() {
  print "  START - background_command, sleeping $BACKGROUND_TIME seconds..."
  ##  Simulate a long-running process.
  sleep $BACKGROUND_TIME
  print "  END - 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"

## wait for the background command.
print "Waiting for $WAIT_TIME seconds"
sleep $WAIT_TIME

print "TIMEOUT reached"

##  If background command is still running, kill it.
if [[ -d "/proc/$background_PID" ]]; then
  kill -9 $background_PID 2>/dev/null  ## kill -9 could be dangerous!
  print "kill signal sent to PID $background_PID"
else
  print "Background process has already finished."
fi

print "END"

exit 0
$

gary_w

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tcl_allowexceptions

Tcl_AllowExceptions(3)					      Tcl Library Procedures					    Tcl_AllowExceptions(3)

__________________________________________________________________________________________________________________________________________________

NAME

       Tcl_AllowExceptions - allow all exceptions in next script evaluation

SYNOPSIS

       #include <tcl.h>

       Tcl_AllowExceptions(interp)

ARGUMENTS

       Tcl_Interp *interp (in)		Interpreter in which script will be evaluated.
_________________________________________________________________

DESCRIPTION

       If  a  script is evaluated at top-level (i.e. no other scripts are pending evaluation when the script is invoked), and if the script termi-
       nates with a completion code other than TCL_OK, TCL_ERROR or TCL_RETURN, then Tcl normally converts this into a TCL_ERROR  return  with	an
       appropriate  message.  The particular script evaluation procedures of Tcl that act in the manner are Tcl_EvalObjEx, Tcl_EvalObjv, Tcl_Eval,
       Tcl_EvalEx, Tcl_GlobalEval, Tcl_GlobalEvalObj, Tcl_VarEval and Tcl_VarEvalVA.

       However, if Tcl_AllowExceptions is invoked immediately before calling one of those a procedures, then arbitrary completion codes  are  per-
       mitted from the script, and they are returned without modification.  This is useful in cases where the caller can deal with exceptions such
       as TCL_BREAK or TCL_CONTINUE in a meaningful way.

KEYWORDS

       continue, break, exception, interpreter

Tcl									7.4						    Tcl_AllowExceptions(3)