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Full Discussion: Why don't kill the script after 5s?
Top Forums Shell Programming and Scripting Why don't kill the script after 5s? Post 302926327 by derekludwig on Sunday 23rd of November 2014 11:12:23 AM
Old 11-23-2014
Shells (bash, ksh, etc) do not propagate signals to non-builtin commands. To illustrate this a bit better, I replaced the sleep in your script with a script tasker
Code:
#! /usr/bin/perl

$\ = ' ';
$| = 1;
$s = 10;

sub handler {printf "\ncaught SIG\%s\n", shift @_; $s = 0; }

$SIG{INT}  = \&handler;
$SIG{TERM} = \&handler;

while ($s--) { print $s; sleep(1); }
printf "\nexit\n";

Nothing fancy, it counts down from 9 with one second delays. So your script is now (with some echos):
Code:
# watchdog process 
mainpid=$$ 
echo mainpid $$
trap : TERM
( sleep 5; echo killing $mainpid; kill $mainpid ) & 
watchdogpid=$! 
echo watcher $!
tasker
echo killing $watchdogpid
kill $watchdogpid

And when run:
Code:
$ yangleiold
mainpid 22277
watcher 22278
9 8 7 6 5 4 killing 22277
3 2 1 0 exit
killing 22278
yangleiold: line 10: kill: (22278) - No such process

What you need to do is have the watchdog kill the subprocess directly:
Code:
# watchdog process 

tasker &
pid=$!

sleep ${1:-5}
echo Killing $pid
kill $pid

Which runs as:
Code:
$ yangleinew
9 8 7 6 5 Killing 32765
caught SIGTERM
exit

Now if the task finishes first, the script will still sleep for the full interval:
Code:
$ yangleinew 20
9 8 7 6 5 4 3 2 1 0 exit
Killing 22361
x: line 8: kill: (22361) - No such process

Hope this helps.
 

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LEARN ABOUT MOJAVE

kill.d

kill.d(1m)							   USER COMMANDS							kill.d(1m)

NAME

       kill.d - snoop process signals as they occur. Uses DTrace.

SYNOPSIS

       kill.d

DESCRIPTION

       kill.d is a simple DTrace program to print details of process signals as they are sent, such as the PID source and destination, signal num-
       ber and result.

       This program can be used to determine which process is sending signals to which other process.

       Since this uses DTrace, only users with root privileges can run this command.

EXAMPLES

       Default output, print process signals as they are sent.
	      # kill.d

FIELDS

       FROM   source PID

       COMMAND
	      source command name

       TO     destination PID

       SIG    destination signal ("9" for a kill -9)

       RESULT result of signal (-1 is for failure)

DOCUMENTATION

       See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with ver-
       bose descriptions explaining the output.

EXIT

       kill.d will run forever until Ctrl-C is hit.

AUTHOR

       Brendan Gregg [Sydney, Australia]

SEE ALSO

       dtrace(1M), truss(1)

version 0.90							   May 14, 2005 							kill.d(1m)
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