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|
-----------------------------------------------------------------------------
-- |
-- Module : System.Cmd
-- Copyright : (c) The University of Glasgow 2001
-- License : BSD-style (see the file libraries/base/LICENSE)
--
-- Maintainer : libraries@haskell.org
-- Stability : provisional
-- Portability : portable
--
-- Executing a command.
--
-----------------------------------------------------------------------------
module System.Cmd
( system -- :: String -> IO ExitCode
) where
import Prelude
import System.Exit
import Foreign.C
#ifdef __GLASGOW_HASKELL__
import GHC.IOBase
#endif
-- ---------------------------------------------------------------------------
-- system
-- Computation `system cmd' returns the exit code
-- produced when the operating system processes the command `cmd'.
-- This computation may fail with
-- PermissionDenied
-- The process has insufficient privileges to perform the operation.
-- ResourceExhausted
-- Insufficient resources are available to perform the operation.
-- UnsupportedOperation
-- The implementation does not support system calls.
system :: String -> IO ExitCode
system "" = ioException (IOError Nothing InvalidArgument "system" "null command" Nothing)
system cmd =
withCString cmd $ \s -> do
status <- throwErrnoIfMinus1 "system" (primSystem s)
case status of
0 -> return ExitSuccess
n -> return (ExitFailure n)
foreign import ccall unsafe "systemCmd" primSystem :: CString -> IO Int
|
