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import System.Directory
import System.IO
import Control.Monad
import System.Posix.Signals
import System.Posix.Types
import Control.Monad.Error.Class
import Control.Exception (throw)
import System.Posix.Process
import Data.Maybe
import System.INotify
import UTmp
import FGConsole
jid user host rsrc = user ++ "@" ++ host ++ "/" ++ rsrc
toJabberId :: String -> (String,String,t) -> Maybe String
toJabberId host (user,tty,_) =
if take 3 tty == "tty"
then Just (jid user host tty)
else Nothing
utmp_event e = do
-- print e
putStrLn "---"
us <- users
let ids = mapMaybe (toJabberId "localhost") us
ids :: [String]
forM_ ids putStrLn
on_chvt vtnum = do
putStrLn $ "changed vt to "++ show vtnum
start :: IO ()
start = do
installHandler sigUSR1 (Catch (utmp_event (userError "signaled"))) Nothing
inotify <- initINotify
print inotify
wd <- addWatch
inotify
[CloseWrite] -- [Open,Close,Access,Modify,Move]
utmp_file
utmp_event
print wd
mtty <- monitorTTY on_chvt
putStrLn "Hit enter to terminate..."
getLine
unmonitorTTY mtty
removeWatch wd
sendUSR1 pid = do
signalProcess sigUSR1 pid
getStartupAction [] = throw (userError "pid file?") >> return (Right "")
getStartupAction (p:ps) = do
catch
( do
pid <- fmap CPid (readFile p >>= readIO)
-- signal pid
return (Left pid) )
onEr
where
onEr e = do
pid <- getProcessID
putStrLn $ "starting pid = "++show pid
catch (do
writeFile p (show pid)
putStrLn $ "writing "++show p
-- start daemon
return (Right p) )
(\_ -> getStartupAction ps)
runOnce ps run notify = getStartupAction ps >>= doit
where
doit (Left pid ) = notify pid
doit (Right pidfile ) = do
run
removeFile pidfile
main = do
runOnce ["/var/run/presence.pid","/tmp/presence.pid"] start sendUSR1
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