Haskell Hierarchical Libraries (unix package) Contents Index

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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