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bugfix

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This commit is contained in:
Joey Hess 2012-06-11 02:06:22 -04:00
parent d0a0a6ae21
commit 433ff41496
1 changed files with 5 additions and 3 deletions
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8
Utility/Daemon.hs
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@ -45,9 +45,11 @@ daemonize logfd pidfile changedirectory a = do
lockPidFile :: Bool -> IO () -> FilePath -> IO ()
lockPidFile write onfailure file = do
fd <- openFd file ReadWrite (Just stdFileMode) defaultFileFlags
when (write) $ void $
fdWrite fd =<< show <$> getProcessID
catchIO (setLock fd (locktype, AbsoluteSeek, 0, 0)) (const onfailure)
locked <- catchMaybeIO $ setLock fd (locktype, AbsoluteSeek, 0, 0)
case locked of
Nothing -> onfailure
_ -> when write $ void $
fdWrite fd =<< show <$> getProcessID
where
locktype
| write = WriteLock