-{-# OPTIONS -cpp -fffi #-}
+{-# OPTIONS_GHC -cpp -fffi #-}
-----------------------------------------------------------------------------
-- |
-- Module : System.Process.Internals
-- #hide
module System.Process.Internals (
ProcessHandle(..), PHANDLE,
+#if !defined(mingw32_HOST_OS) && !defined(__MINGW32__)
+ pPrPr_disableITimers, c_execvpe,
+# ifdef __GLASGOW_HASKELL__
+ runProcessPosix,
+# endif
+ ignoreSignal, defaultSignal,
+#else
+# ifdef __GLASGOW_HASKELL__
+ runProcessWin32, translate,
+# endif
+#endif
+ commandToProcess,
+ withFilePathException, withCEnvironment
) where
-#if !defined(mingw32_TARGET_OS) && !defined(__MINGW32__)
+import Prelude -- necessary to get dependencies right
+
+#if !defined(mingw32_HOST_OS) && !defined(__MINGW32__)
import System.Posix.Types ( CPid )
+import System.IO ( Handle )
#else
import Data.Word ( Word32 )
#endif
+import Data.Maybe ( fromMaybe )
+# ifdef __GLASGOW_HASKELL__
+import GHC.IOBase ( haFD, FD, Exception(..), IOException(..) )
+import GHC.Handle ( stdin, stdout, stderr, withHandle_ )
+# elif __HUGS__
+import Hugs.Exception ( Exception(..), IOException(..) )
+# endif
+
+import Control.Exception ( handle, throwIO )
+import Foreign.C
+import Foreign
+
+#ifdef __HUGS__
+{-# CFILES cbits/execvpe.c #-}
+#endif
+
+#include "HsBaseConfig.h"
+
-- ----------------------------------------------------------------------------
-- ProcessHandle type
termination: they all return a 'ProcessHandle' which may be used
to wait for the process later.
-}
-#if !defined(mingw32_TARGET_OS) && !defined(__MINGW32__)
+#if !defined(mingw32_HOST_OS) && !defined(__MINGW32__)
type PHANDLE = CPid
#else
type PHANDLE = Word32
#endif
newtype ProcessHandle = ProcessHandle PHANDLE
+
+-- ----------------------------------------------------------------------------
+
+#if !defined(mingw32_HOST_OS) && !defined(__MINGW32__)
+
+-- this function disables the itimer, which would otherwise cause confusing
+-- signals to be sent to the new process.
+foreign import ccall unsafe "pPrPr_disableITimers"
+ pPrPr_disableITimers :: IO ()
+
+foreign import ccall unsafe "execvpe"
+ c_execvpe :: CString -> Ptr CString -> Ptr CString -> IO CInt
+
+#endif
+
+#if !defined(mingw32_HOST_OS) && !defined(__MINGW32__)
+
+#ifdef __GLASGOW_HASKELL__
+-- -----------------------------------------------------------------------------
+-- POSIX runProcess with signal handling in the child
+
+runProcessPosix
+ :: String
+ -> FilePath -- ^ Filename of the executable
+ -> [String] -- ^ Arguments to pass to the executable
+ -> Maybe FilePath -- ^ Optional path to the working directory
+ -> Maybe [(String,String)] -- ^ Optional environment (otherwise inherit)
+ -> Maybe Handle -- ^ Handle to use for @stdin@
+ -> Maybe Handle -- ^ Handle to use for @stdout@
+ -> Maybe Handle -- ^ Handle to use for @stderr@
+ -> Maybe CLong -- handler for SIGINT
+ -> Maybe CLong -- handler for SIGQUIT
+ -> IO ProcessHandle
+
+runProcessPosix fun cmd args mb_cwd mb_env mb_stdin mb_stdout mb_stderr
+ mb_sigint mb_sigquit
+ = withFilePathException cmd $
+ withHandle_ fun (fromMaybe stdin mb_stdin) $ \hndStdInput ->
+ withHandle_ fun (fromMaybe stdout mb_stdout) $ \hndStdOutput ->
+ withHandle_ fun (fromMaybe stderr mb_stderr) $ \hndStdError ->
+ maybeWith withCEnvironment mb_env $ \pEnv ->
+ maybeWith withCString mb_cwd $ \pWorkDir ->
+ withMany withCString (cmd:args) $ \cstrs ->
+ let (set_int, inthand)
+ = case mb_sigint of
+ Nothing -> (0, 0)
+ Just hand -> (1, hand)
+ (set_quit, quithand)
+ = case mb_sigquit of
+ Nothing -> (0, 0)
+ Just hand -> (1, hand)
+ in
+ withArray0 nullPtr cstrs $ \pargs -> do
+ ph <- throwErrnoIfMinus1 fun $
+ c_runProcess pargs pWorkDir pEnv
+ (haFD hndStdInput)
+ (haFD hndStdOutput)
+ (haFD hndStdError)
+ set_int inthand set_quit quithand
+ return (ProcessHandle ph)
+
+foreign import ccall unsafe "runProcess"
+ c_runProcess
+ :: Ptr CString -- args
+ -> CString -- working directory (or NULL)
+ -> Ptr CString -- env (or NULL)
+ -> FD -- stdin
+ -> FD -- stdout
+ -> FD -- stderr
+ -> CInt -- non-zero: set child's SIGINT handler
+ -> CLong -- SIGINT handler
+ -> CInt -- non-zero: set child's SIGQUIT handler
+ -> CLong -- SIGQUIT handler
+ -> IO PHANDLE
+
+#endif /* __GLASGOW_HASKELL__ */
+
+ignoreSignal = CONST_SIG_IGN :: CLong
+defaultSignal = CONST_SIG_DFL :: CLong
+
+#else
+
+#ifdef __GLASGOW_HASKELL__
+
+runProcessWin32 fun cmd args mb_cwd mb_env
+ mb_stdin mb_stdout mb_stderr extra_cmdline
+ = withFilePathException cmd $
+ withHandle_ fun (fromMaybe stdin mb_stdin) $ \hndStdInput ->
+ withHandle_ fun (fromMaybe stdout mb_stdout) $ \hndStdOutput ->
+ withHandle_ fun (fromMaybe stderr mb_stderr) $ \hndStdError ->
+ maybeWith withCEnvironment mb_env $ \pEnv -> do
+ maybeWith withCString mb_cwd $ \pWorkDir -> do
+ let cmdline = translate cmd ++
+ concat (map ((' ':) . translate) args) ++
+ (if null extra_cmdline then "" else ' ':extra_cmdline)
+ withCString cmdline $ \pcmdline -> do
+ proc_handle <- throwErrnoIfMinus1 fun
+ (c_runProcess pcmdline pWorkDir pEnv
+ (haFD hndStdInput)
+ (haFD hndStdOutput)
+ (haFD hndStdError))
+ return (ProcessHandle proc_handle)
+
+foreign import ccall unsafe "runProcess"
+ c_runProcess
+ :: CString
+ -> CString
+ -> Ptr ()
+ -> FD
+ -> FD
+ -> FD
+ -> IO PHANDLE
+
+-- ------------------------------------------------------------------------
+-- Passing commands to the OS on Windows
+
+{-
+On Windows this is tricky. We use CreateProcess, passing a single
+command-line string (lpCommandLine) as its argument. (CreateProcess
+is well documented on http://msdn.microsoft/com.)
+
+ - It parses the beginning of the string to find the command. If the
+ file name has embedded spaces, it must be quoted, using double
+ quotes thus
+ "foo\this that\cmd" arg1 arg2
+
+ - The invoked command can in turn access the entire lpCommandLine string,
+ and the C runtime does indeed do so, parsing it to generate the
+ traditional argument vector argv[0], argv[1], etc. It does this
+ using a complex and arcane set of rules which are described here:
+
+ http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccelng/htm/progs_12.asp
+
+ (if this URL stops working, you might be able to find it by
+ searching for "Parsing C Command-Line Arguments" on MSDN. Also,
+ the code in the Microsoft C runtime that does this translation
+ is shipped with VC++).
+
+Our goal in runProcess is to take a command filename and list of
+arguments, and construct a string which inverts the translatsions
+described above, such that the program at the other end sees exactly
+the same arguments in its argv[] that we passed to rawSystem.
+
+This inverse translation is implemented by 'translate' below.
+
+Here are some pages that give informations on Windows-related
+limitations and deviations from Unix conventions:
+
+ http://support.microsoft.com/default.aspx?scid=kb;en-us;830473
+ Command lines and environment variables effectively limited to 8191
+ characters on Win XP, 2047 on NT/2000 (probably even less on Win 9x):
+
+ http://www.microsoft.com/windowsxp/home/using/productdoc/en/default.asp?url=/WINDOWSXP/home/using/productdoc/en/percent.asp
+ Command-line substitution under Windows XP. IIRC these facilities (or at
+ least a large subset of them) are available on Win NT and 2000. Some
+ might be available on Win 9x.
+
+ http://www.microsoft.com/windowsxp/home/using/productdoc/en/default.asp?url=/WINDOWSXP/home/using/productdoc/en/Cmd.asp
+ How CMD.EXE processes command lines.
+
+
+Note: CreateProcess does have a separate argument (lpApplicationName)
+with which you can specify the command, but we have to slap the
+command into lpCommandLine anyway, so that argv[0] is what a C program
+expects (namely the application name). So it seems simpler to just
+use lpCommandLine alone, which CreateProcess supports.
+-}
+
+-- Translate command-line arguments for passing to CreateProcess().
+translate :: String -> String
+translate str = '"' : snd (foldr escape (True,"\"") str)
+ where escape '"' (b, str) = (True, '\\' : '"' : str)
+ escape '\\' (True, str) = (True, '\\' : '\\' : str)
+ escape '\\' (False, str) = (False, '\\' : str)
+ escape c (b, str) = (False, c : str)
+ -- See long comment above for what this function is trying to do.
+ --
+ -- The Bool passed back along the string is True iff the
+ -- rest of the string is a sequence of backslashes followed by
+ -- a double quote.
+
+#endif /* __GLASGOW_HASKELL__ */
+
+#endif
+
+-- ----------------------------------------------------------------------------
+-- commandToProcess
+
+{- | Turns a shell command into a raw command. Usually this involves
+ wrapping it in an invocation of the shell.
+
+ There's a difference in the signature of commandToProcess between
+ the Windows and Unix versions. On Unix, exec takes a list of strings,
+ and we want to pass our command to /bin/sh as a single argument.
+
+ On Windows, CreateProcess takes a single string for the command,
+ which is later decomposed by cmd.exe. In this case, we just want
+ to prepend @\"c:\WINDOWS\CMD.EXE \/c\"@ to our command line. The
+ command-line translation that we normally do for arguments on
+ Windows isn't required (or desirable) here.
+-}
+
+#if !defined(mingw32_HOST_OS) && !defined(__MINGW32__)
+
+commandToProcess
+ :: String
+ -> IO (FilePath,[String])
+commandToProcess string = return ("/bin/sh", ["-c", string])
+
+#else
+
+commandToProcess
+ :: String
+ -> IO (FilePath,String)
+commandToProcess string = do
+ sysDir <- allocaBytes 1024 (\pdir -> c_getSystemDirectory pdir 1024 >> peekCString pdir)
+ return (sysDir ++ "\\CMD.EXE", "/c " ++ string)
+ -- We don't want to put the cmd into a single
+ -- argument, because cmd.exe will not try to split it up. Instead,
+ -- we just tack the command on the end of the cmd.exe command line,
+ -- which partly works. There seem to be some quoting issues, but
+ -- I don't have the energy to find+fix them right now (ToDo). --SDM
+
+foreign import stdcall unsafe "GetSystemDirectoryA"
+ c_getSystemDirectory
+ :: CString
+ -> CInt
+ -> IO CInt
+
+#endif
+
+-- ----------------------------------------------------------------------------
+-- Utils
+
+withFilePathException :: FilePath -> IO a -> IO a
+withFilePathException fpath act = handle mapEx act
+ where
+ mapEx (IOException (IOError h iot fun str _)) = ioError (IOError h iot fun str (Just fpath))
+ mapEx e = throwIO e
+
+#if !defined(mingw32_HOST_OS) && !defined(__MINGW32__)
+withCEnvironment :: [(String,String)] -> (Ptr CString -> IO a) -> IO a
+withCEnvironment env act =
+ let env' = map (\(name, val) -> name ++ ('=':val)) env
+ in withMany withCString env' (\pEnv -> withArray0 nullPtr pEnv act)
+#else
+withCEnvironment :: [(String,String)] -> (Ptr () -> IO a) -> IO a
+withCEnvironment env act =
+ let env' = foldr (\(name, val) env -> name ++ ('=':val)++'\0':env) "\0" env
+ in withCString env' (act . castPtr)
+#endif
+
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