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|
#if __GLASGOW_HASKELL__ >= 709
{-# LANGUAGE Safe #-}
#else
{-# LANGUAGE Trustworthy #-}
#endif
-----------------------------------------------------------------------------
-- |
-- Module : System.Posix.Process
-- Copyright : (c) The University of Glasgow 2002
-- License : BSD-style (see the file libraries/base/LICENSE)
--
-- Maintainer : libraries@haskell.org
-- Stability : provisional
-- Portability : non-portable (requires POSIX)
--
-- POSIX process support. See also the System.Cmd and System.Process
-- modules in the process package.
--
-----------------------------------------------------------------------------
module System.Posix.Process (
-- * Processes
-- ** Forking and executing
forkProcess,
forkProcessWithUnmask,
executeFile,
-- ** Exiting
exitImmediately,
-- ** Process environment
getProcessID,
getParentProcessID,
-- ** Process groups
getProcessGroupID,
getProcessGroupIDOf,
createProcessGroupFor,
joinProcessGroup,
setProcessGroupIDOf,
-- ** Sessions
createSession,
-- ** Process times
ProcessTimes(..),
getProcessTimes,
-- ** Scheduling priority
nice,
getProcessPriority,
getProcessGroupPriority,
getUserPriority,
setProcessPriority,
setProcessGroupPriority,
setUserPriority,
-- ** Process status
ProcessStatus(..),
getProcessStatus,
getAnyProcessStatus,
getGroupProcessStatus,
-- ** Deprecated
createProcessGroup,
setProcessGroupID,
) where
#include "HsUnix.h"
import Foreign
import Foreign.C
import System.Posix.Process.Internals
import System.Posix.Process.Common
import System.Posix.Internals ( withFilePath )
-- | @'executeFile' cmd args env@ calls one of the
-- @execv*@ family, depending on whether or not the current
-- PATH is to be searched for the command, and whether or not an
-- environment is provided to supersede the process's current
-- environment. The basename (leading directory names suppressed) of
-- the command is passed to @execv*@ as @arg[0]@;
-- the argument list passed to 'executeFile' therefore
-- begins with @arg[1]@.
executeFile :: FilePath -- ^ Command
-> Bool -- ^ Search PATH?
-> [String] -- ^ Arguments
-> Maybe [(String, String)] -- ^ Environment
-> IO a
executeFile path search args Nothing = do
withFilePath path $ \s ->
withMany withFilePath (path:args) $ \cstrs ->
withArray0 nullPtr cstrs $ \arr -> do
pPrPr_disableITimers
if search
then throwErrnoPathIfMinus1_ "executeFile" path (c_execvp s arr)
else throwErrnoPathIfMinus1_ "executeFile" path (c_execv s arr)
return undefined -- never reached
executeFile path search args (Just env) = do
withFilePath path $ \s ->
withMany withFilePath (path:args) $ \cstrs ->
withArray0 nullPtr cstrs $ \arg_arr ->
let env' = map (\ (name, val) -> name ++ ('=' : val)) env in
withMany withFilePath env' $ \cenv ->
withArray0 nullPtr cenv $ \env_arr -> do
pPrPr_disableITimers
if search
then throwErrnoPathIfMinus1_ "executeFile" path
(c_execvpe s arg_arr env_arr)
else throwErrnoPathIfMinus1_ "executeFile" path
(c_execve s arg_arr env_arr)
return undefined -- never reached
foreign import ccall unsafe "execvp"
c_execvp :: CString -> Ptr CString -> IO CInt
foreign import ccall unsafe "execv"
c_execv :: CString -> Ptr CString -> IO CInt
foreign import ccall unsafe "execve"
c_execve :: CString -> Ptr CString -> Ptr CString -> IO CInt
|
