Re: io.popen processes hanging around after close

On Mon, Oct 28, 2013 at 11:51 AM, Justin Cormack <justin@specialbusservice.com> wrote:

On Mon, Oct 28, 2013 at 3:35 PM, Rena <hyperhacker@gmail.com> wrote:
> In my app I open a few processes using io.popen(), then read their output
> using posix.fileno() and posix.rpoll() to see if there's data available.
> When my app shuts down however (using os.exit(0)), even if I close the
> process file handles, they remain running in the background. How do I
> prevent this? I do both process:close() and posix.close(fd). (I found
> without the latter, the former would just hang...)

You can either send a kill (posix.kill) signal to the child, or make
the child test to see if the pipe is still open - it depends if it is
doing anything or is blocked, and how much it is under your control.

Justin

But how do I get the child's PID?

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