[Haskell-cafe] Re: Running a "sub-process" which dies with the main program

[Aycan iRiCAN]

Cum, 2009-06-19 tarihinde 12:42 +0200 saatinde, Deniz Dogan yazdı:
> 2009/6/19 Aycan iRiCAN <aycan.irican at core.gen.tr>:
> >
> > Cum, 2009-06-19 tarihinde 11:58 +0200 saatinde, Deniz Dogan yazdı:
> >> 2009/6/18 Deniz Dogan <deniz.a.m.dogan at gmail.com>:
> >> > Hi
> >> >
> >> > I couldn't come up with a better subject than this one, so anyways...
> >> >
> >> > I have a small program which spawns a subprocess. However, when I hit
> >> > C-c, the subprocess won't die, instead it will just keep running until
> >> > it's done or until I kill it. I've looked around in System.Process for
> >> > something suitable for my needs, but I can't seem to find it. Any
> >> > ideas?
> >>
> >> With a tip from a person outside of the mailing list I found
> >> System.Process.system, which essentially does exactly what I was
> >> asking for.
> >
> > Hey I'm already subscribed :) You can read from "sout" and "serr" with
> > below example. Hope that it helps.
> >
> >
> > module Main where
> >
> > import System.Process  -- using process-1.0.1.1
> >
> > main = do
> >  (_, sout, serr, p) <- createProcess (proc "sleep" ["10"])
> >                        { std_out = CreatePipe
> >                        , std_err = CreatePipe }
> >  r <- waitForProcess p
> >  return ()
> >
> 
> Thanks!
> 
> But this was the approach I used before I went to
> System.Process.system and it did not work on my Linux machine.

Give it a try. Try to send CTRL-C and look if "sleep 10" (which is a
subprocess) process terminates.

aycan at aycan:~/haskell$ time ./deniz2 && ps -ef | grep sleep
^C
real	0m0.707s
user	0m0.001s
sys	0m0.004s
   aycan 13098  4430   0 13:50:23 pts/7       0:00 grep sleep

It terminates with ghc 6.10.3 on OpenSolaris.

Best Regards,
--
aycan