On Thu, Jan 22, 2009 at 5:58 PM, Nerius Landys <nlan...@gmail.com> wrote:
> Actually, because of the "exec" in the parent script, the line below
> it, the "killing terminator process" line, never gets reached. So the
> terminator process that waits to kill its parent always waits the full
> 5 seconds in the background. If I pipe the output of the parent
> script through less, it waits 5 seconds before it reaches the end of
> the output. That is annoying. Is there any way to solve that?
>
I see what you mean. Here's another option without exec:
#!/bin/sh -T
kill_all()
{
echo 'killing everything'
kill $SPID $CPID 2> /dev/null
exit 0
}
trap kill_all SIGCHLD
./child &
CPID=$!
sleep 5 &
SPID=$!
echo "child is $CPID"
echo "sleeper is $SPID"
wait
Here I'm using the fact that the termination of any child process
causes SIGCHILD to be sent to the parent. Notice the '-T' in the first
line; this is important, because without it the 'wait' call isn't
interrupted until both children are dead. Unfortunately, this is a
non-standard option, so you'll have to check if it is supported in
your environment.
- Max
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