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import System.Posix.Process
main = do
pid <- getProcessID
ppid <- getParentProcessID
ppgid <- getProcessGroupIDOf ppid
-- join the parent process
putStr "Testing joinProcessGroup: "
joinProcessGroup ppgid
pgid1 <- getProcessGroupID
print $ ppgid == pgid1
-- be a leader
putStr "Testing createProcessGroupFor: "
createProcessGroupFor pid
pgid2 <- getProcessGroupID
print $ pid == fromIntegral pgid2
-- and join the parent again
putStr "Testing setProcessGroupIDOf: "
setProcessGroupIDOf pid ppgid
pgid3 <- getProcessGroupID
print $ ppgid == pgid3
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