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|
{-# LANGUAGE CPP #-}
module Program.Mighty.Resource (
amIrootUser
, setGroupUser
, unlimit
) where
import System.Posix
import UnliftIO.Exception
----------------------------------------------------------------
-- | Checking if this process has the root privilege.
amIrootUser :: IO Bool
amIrootUser = (== 0) <$> getRealUserID
----------------------------------------------------------------
-- | Setting user and group.
setGroupUser :: String -- ^ User
-> String -- ^ Group
-> IO Bool
setGroupUser user group = do
root <- amIrootUser
if root then do
getGroupEntryForName group >>= setGroupID . groupID
getUserEntryForName user >>= setUserID . userID
return True
else
return False
----------------------------------------------------------------
-- | Set the limit of open files.
unlimit :: Integer -> IO ()
unlimit limit = handle (\(SomeException _) -> return ()) $ do
hard <- hardLimit <$> getResourceLimit ResourceOpenFiles
let lim = if hard == ResourceLimitInfinity then
ResourceLimits (ResourceLimit limit) hard
else
ResourceLimits hard hard
setResourceLimit ResourceOpenFiles lim
|
