From: 7stud -- <bbxx789_05ss@...>
Date: 2007-10-29T16:42:31+09:00
Subject: Re: Kill an IO.popen'ed program?

Jared Davis wrote:
> Hi,
> 
> I'm looking for a way to forcibly terminate a process started with a
> pipe.  That is, when I run:
> 
>    file = IO.popen("sleep 300", "r+")
>    file.close
> 
> The file.close command just hangs and waits for the sleep command to
> finish.  Is there some way I can instead say, "I don't care if it's
> finished or not, kill the program now and close the pipe"?
> 
> Thanks,
>    Jared


Try this:

p = IO.popen("sleep 10", "r+")

id = p.pid
puts id

sleep(5)
Process.kill("SIGALRM", id)


The man page for sleep says:

-----
The sleep utility exits with one of the following values:

     0     On successful completion, or if the signal SIGALRM was 
received.

     >0    An error occurred.
-----


Or you can issue a shell command using system():


#Process.kill("SIGALRM", id)
system("kill -SIGALRM #{id}")

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