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|
{- daemon support
-
- Copyright 2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Utility.Daemon where
import Common
import System.Posix
{- Run an action as a daemon, with all output sent to a file descriptor.
-
- Can write its pid to a file, to guard against multiple instances
- running and allow easy termination.
-
- When successful, does not return. -}
daemonize :: Fd -> Maybe FilePath -> Bool -> IO () -> IO ()
daemonize logfd pidfile changedirectory a = do
_ <- forkProcess child1
out
where
child1 = do
_ <- createSession
_ <- forkProcess child2
out
child2 = do
maybe noop (lockPidFile alreadyrunning) pidfile
when changedirectory $
setCurrentDirectory "/"
nullfd <- openFd "/dev/null" ReadOnly Nothing defaultFileFlags
_ <- redir nullfd stdInput
mapM_ (redir logfd) [stdOutput, stdError]
closeFd logfd
a
out
redir newh h = do
closeFd h
dupTo newh h
alreadyrunning = error "Daemon is already running."
out = exitImmediately ExitSuccess
{- Locks the pid file, with an exclusive, non-blocking lock.
- Runs an action on failure. On success, writes the pid to the file,
- fully atomically. -}
lockPidFile :: IO () -> FilePath -> IO ()
lockPidFile onfailure file = do
fd <- openFd file ReadWrite (Just stdFileMode) defaultFileFlags
locked <- catchMaybeIO $ setLock fd (WriteLock, AbsoluteSeek, 0, 0)
fd' <- openFd newfile ReadWrite (Just stdFileMode) defaultFileFlags
{ trunc = True }
locked' <- catchMaybeIO $ setLock fd' (WriteLock, AbsoluteSeek, 0, 0)
case (locked, locked') of
(Nothing, _) -> onfailure
(_, Nothing) -> onfailure
_ -> do
_ <- fdWrite fd' =<< show <$> getProcessID
renameFile newfile file
closeFd fd
where
newfile = file ++ ".new"
{- Stops the daemon.
-
- The pid file is used to get the daemon's pid.
-
- To guard against a stale pid, check the lock of the pid file,
- and compare the process that has it locked with the file content.
-}
stopDaemon :: FilePath -> IO ()
stopDaemon pidfile = do
fd <- openFd pidfile ReadOnly (Just stdFileMode) defaultFileFlags
locked <- getLock fd (ReadLock, AbsoluteSeek, 0, 0)
p <- readish <$> readFile pidfile
case (locked, p) of
(Nothing, _) -> noop
(_, Nothing) -> noop
(Just (pid, _), Just pid')
| pid == pid' -> signalProcess sigTERM pid
| otherwise -> error $
"stale pid in " ++ pidfile ++
" (got " ++ show pid' ++
"; expected" ++ show pid ++ " )"
|
