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System.Posix.Process

Portability | non-portable (requires POSIX)
Stability | provisional
Maintainer | libraries@haskell.org

Contents

Processes
  Forking and executing
  Exiting
  Process environment
  Process groups
  Sessions
  Process times
  Scheduling priority
  Process status

Description
POSIX process support
Synopsis

forkProcess :: IO () -> IO ProcessID
executeFile :: FilePath -> Bool -> [String] -> Maybe [(String, String)] -> IO ()
exitImmediately :: ExitCode -> IO ()
getProcessID :: IO ProcessID
getParentProcessID :: IO ProcessID
getProcessGroupID :: IO ProcessGroupID
createProcessGroup :: ProcessID -> IO ProcessGroupID
joinProcessGroup :: ProcessGroupID -> IO ()
setProcessGroupID :: ProcessID -> ProcessGroupID -> IO ()
createSession :: IO ProcessGroupID

data ProcessTimes = ProcessTimes {

elapsedTime :: ClockTick
userTime :: ClockTick
systemTime :: ClockTick
childUserTime :: ClockTick
childSystemTime :: ClockTick

}

getProcessTimes :: IO ProcessTimes
nice :: Int -> IO ()
getProcessPriority :: ProcessID -> IO Int
getProcessGroupPriority :: ProcessGroupID -> IO Int
getUserPriority :: UserID -> IO Int
setProcessPriority :: ProcessID -> Int -> IO ()
setProcessGroupPriority :: ProcessGroupID -> Int -> IO ()
setUserPriority :: UserID -> Int -> IO ()

data ProcessStatus

= Exited ExitCode
| Terminated Signal
| Stopped Signal

getProcessStatus :: Bool -> Bool -> ProcessID -> IO (Maybe ProcessStatus)
getAnyProcessStatus :: Bool -> Bool -> IO (Maybe (ProcessID, ProcessStatus))
getGroupProcessStatus :: Bool -> Bool -> ProcessGroupID -> IO (Maybe (ProcessID, ProcessStatus))

Processes
Forking and executing
forkProcess :: IO () -> IO ProcessID
`forkProcess` corresponds to the POSIX `fork` system call. The `IO` action passed as an argument is executed in the child process; no other threads will be copied to the child process. On success, `forkProcess` returns the child's `ProcessID` to the parent process; in case of an error, an exception is thrown.
executeFile :: FilePath -> Bool -> [String] -> Maybe [(String, String)] -> IO ()
Exiting
exitImmediately :: ExitCode -> IO ()
Process environment
getProcessID :: IO ProcessID
getParentProcessID :: IO ProcessID
getProcessGroupID :: IO ProcessGroupID
Process groups
createProcessGroup :: ProcessID -> IO ProcessGroupID
joinProcessGroup :: ProcessGroupID -> IO ()
setProcessGroupID :: ProcessID -> ProcessGroupID -> IO ()
Sessions
createSession :: IO ProcessGroupID
Process times
data ProcessTimes

Constructors

ProcessTimes |

elapsedTime :: ClockTick |
userTime :: ClockTick |
systemTime :: ClockTick |
childUserTime :: ClockTick |
childSystemTime :: ClockTick |

getProcessTimes :: IO ProcessTimes
Scheduling priority
nice :: Int -> IO ()
getProcessPriority :: ProcessID -> IO Int
getProcessGroupPriority :: ProcessGroupID -> IO Int
getUserPriority :: UserID -> IO Int
setProcessPriority :: ProcessID -> Int -> IO ()
setProcessGroupPriority :: ProcessGroupID -> Int -> IO ()
setUserPriority :: UserID -> Int -> IO ()
Process status
data ProcessStatus

Constructors

Exited ExitCode |
Terminated Signal |
Stopped Signal |

Instances

Eq ProcessStatus
Ord ProcessStatus
Show ProcessStatus

getProcessStatus :: Bool -> Bool -> ProcessID -> IO (Maybe ProcessStatus)
getAnyProcessStatus :: Bool -> Bool -> IO (Maybe (ProcessID, ProcessStatus))
getGroupProcessStatus :: Bool -> Bool -> ProcessGroupID -> IO (Maybe (ProcessID, ProcessStatus))
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