xmonad/Main.hs
Spencer Janssen 0fecae0abc Remove doubleFork, handle SIGCHLD
This is a rather big change.  Rather than make spawned processes become
children of init, we handle them in xmonad.  As a side effect of this change,
we never need to use waitForProcess in any contrib module -- in fact, doing so
will raise an exception.  The main benefit to handling SIGCHLD is that xmonad
can now be started with 'exec', and will correctly clean up after inherited
child processes.
2009-01-16 20:47:42 +00:00

86 lines
2.5 KiB
Haskell

----------------------------------------------------------------------------
-- |
-- Module : Main
-- Copyright : (c) Spencer Janssen 2007
-- License : BSD3-style (see LICENSE)
--
-- Maintainer : sjanssen@cse.unl.edu
-- Stability : unstable
-- Portability : not portable, uses mtl, X11, posix
--
-- xmonad, a minimalist, tiling window manager for X11
--
-----------------------------------------------------------------------------
module Main (main) where
import XMonad
import System.IO
import System.Info
import System.Environment
import System.Posix.Process (executeFile)
import Paths_xmonad (version)
import Data.Version (showVersion)
#ifdef TESTING
import qualified Properties
#endif
-- | The entry point into xmonad. Attempts to compile any custom main
-- for xmonad, and if it doesn't find one, just launches the default.
main :: IO ()
main = do
installSignalHandlers -- important to ignore SIGCHLD to avoid zombies
args <- getArgs
let launch = catchIO buildLaunch >> xmonad defaultConfig
case args of
[] -> launch
["--resume", _] -> launch
["--help"] -> usage
["--recompile"] -> recompile True >> return ()
["--version"] -> putStrLn ("xmonad " ++ showVersion version)
#ifdef TESTING
("--run-tests":_) -> Properties.main
#endif
_ -> fail "unrecognized flags"
usage :: IO ()
usage = do
self <- getProgName
putStr . unlines $
concat ["Usage: ", self, " [OPTION]"] :
"Options:" :
" --help Print this message" :
" --version Print the version number" :
" --recompile Recompile your ~/.xmonad/xmonad.hs" :
#ifdef TESTING
" --run-tests Run the test suite" :
#endif
[]
-- | Build "~\/.xmonad\/xmonad.hs" with ghc, then execute it. If there are no
-- errors, this function does not return. An exception is raised in any of
-- these cases:
--
-- * ghc missing
--
-- * "~\/.xmonad\/xmonad.hs" missing
--
-- * xmonad.hs fails to compile
--
-- ** wrong ghc in path (fails to compile)
--
-- ** type error, syntax error, ..
--
-- * Missing XMonad\/XMonadContrib modules due to ghc upgrade
--
buildLaunch :: IO ()
buildLaunch = do
recompile False
dir <- getXMonadDir
args <- getArgs
executeFile (dir ++ "/xmonad-"++arch++"-"++os) False args Nothing
return ()