[Haskell-cafe] How to terminate the process group of a processcreated with createProcess?
andre.scholz at uni-bremen.de
Thu Jan 12 12:56:05 CET 2012
On 11.01.2012 at 23:08 Donn Cave wrote:
> Quoth Brandon Allbery <allbery.b at gmail.com>,
> > terminateProcess passes on the semantics of kill(2); on SVID-compliant
> > (and I think POSIX.1-compliant) systems, the negative of the process
> > group leader's process ID is used to signal the process group. Note
> > that you may need to arrange for your initial child process to invoke
> > setpgrp() to insure that the parent program is not part of the process
> > group.
> ... and that stuff can be found in System.Posix.Process. Support for
> POSIX killpg can be found in System.Posix.Signals, by the way in case
> you think that would make your intention more transparent.
terminateProcessGroup :: ProcessHandle -> IO ()
terminateProcessGroup ph = do
let (ProcessHandle pmvar) = ph
ph_ <- readMVar pmvar
case ph_ of
OpenHandle pid -> do -- pid is a POSIX pid
gid <- createProcessGroup pid
signalProcessGroup 15 pid
otherwise -> error "Somethings wrong."
but i get the error message:
"createProcessGroup: permission denied"
Is there a way around this permission problem?
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