79 lines
2.5 KiB
Haskell
79 lines
2.5 KiB
Haskell
{-# LANGUAGE CApiFFI #-}
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{-# LANGUAGE Trustworthy #-}
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module System.Posix.Process.Internals (
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pPrPr_disableITimers, c_execvpe,
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decipherWaitStatus, ProcessStatus(..) ) where
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import Foreign
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import Foreign.C
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import System.Exit
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import System.IO.Error
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import GHC.Conc (Signal)
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-- | The exit status of a process
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data ProcessStatus
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= Exited ExitCode -- ^ the process exited by calling
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-- @exit()@ or returning from @main@
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| Terminated Signal Bool -- ^ the process was terminated by a
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-- signal, the @Bool@ is @True@ if a core
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-- dump was produced
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--
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-- @since 2.7.0.0
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| Stopped Signal -- ^ the process was stopped by a signal
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deriving (Eq, Ord, Show)
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-- this function disables the itimer, which would otherwise cause confusing
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-- signals to be sent to the new process.
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foreign import capi unsafe "Rts.h stopTimer"
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pPrPr_disableITimers :: IO ()
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foreign import ccall unsafe "__hsunix_execvpe"
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c_execvpe :: CString -> Ptr CString -> Ptr CString -> IO CInt
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decipherWaitStatus :: CInt -> IO ProcessStatus
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decipherWaitStatus wstat =
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if c_WIFEXITED wstat /= 0
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then do
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let exitstatus = c_WEXITSTATUS wstat
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if exitstatus == 0
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then return (Exited ExitSuccess)
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else return (Exited (ExitFailure (fromIntegral exitstatus)))
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else do
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if c_WIFSIGNALED wstat /= 0
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then do
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let termsig = c_WTERMSIG wstat
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let coredumped = c_WCOREDUMP wstat /= 0
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return (Terminated termsig coredumped)
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else do
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if c_WIFSTOPPED wstat /= 0
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then do
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let stopsig = c_WSTOPSIG wstat
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return (Stopped stopsig)
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else do
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ioError (mkIOError illegalOperationErrorType
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"waitStatus" Nothing Nothing)
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foreign import capi unsafe "HsUnix.h WIFEXITED"
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c_WIFEXITED :: CInt -> CInt
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foreign import capi unsafe "HsUnix.h WEXITSTATUS"
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c_WEXITSTATUS :: CInt -> CInt
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foreign import capi unsafe "HsUnix.h WIFSIGNALED"
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c_WIFSIGNALED :: CInt -> CInt
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foreign import capi unsafe "HsUnix.h WTERMSIG"
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c_WTERMSIG :: CInt -> CInt
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foreign import capi unsafe "HsUnix.h WIFSTOPPED"
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c_WIFSTOPPED :: CInt -> CInt
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foreign import capi unsafe "HsUnix.h WSTOPSIG"
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c_WSTOPSIG :: CInt -> CInt
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foreign import capi unsafe "HsUnix.h WCOREDUMP"
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c_WCOREDUMP :: CInt -> CInt
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