Kill an IO.popen'ed program?

Ruby
1

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

2

Hi,

At Mon, 29 Oct 2007 15:33:37 +0900,
Jared Davis wrote in [ruby-talk:276378]:

I’m looking for a way to forcibly terminate a process started with a
pipe. That is, when I run:

Process.kill(“TERM”, file.pid)

3

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}”)