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Diffstat (limited to 'src/System/Process')
| -rw-r--r-- | src/System/Process/Concurrent.hs | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/src/System/Process/Concurrent.hs b/src/System/Process/Concurrent.hs new file mode 100644 index 00000000..0e00e4fd --- /dev/null +++ b/src/System/Process/Concurrent.hs @@ -0,0 +1,34 @@ +-- | +-- Copyright: 2015 Joey Hess <id@joeyh.name> +-- License: BSD-2-clause +-- +-- The functions exported by this module are intended to be drop-in +-- replacements for those from System.Process, when converting a whole +-- program to use System.Console.Concurrent. + +module System.Process.Concurrent where + +import System.Console.Concurrent +import System.Console.Concurrent.Internal (ConcurrentProcessHandle(..)) +import System.Process hiding (createProcess, waitForProcess) +import System.IO +import System.Exit + +-- | Calls `createProcessConcurrent` +-- +-- You should use the waitForProcess in this module on the resulting +-- ProcessHandle. Using System.Process.waitForProcess instead can have +-- mildly unexpected results. +createProcess :: CreateProcess -> IO (Maybe Handle, Maybe Handle, Maybe Handle, ProcessHandle) +createProcess p = do + (i, o, e, ConcurrentProcessHandle h) <- createProcessConcurrent p + return (i, o, e, h) + +-- | Calls `waitForProcessConcurrent` +-- +-- You should only use this on a ProcessHandle obtained by calling +-- createProcess from this module. Using this with a ProcessHandle +-- obtained from System.Process.createProcess etc will have extremely +-- unexpected results; it can wait a very long time before returning. +waitForProcess :: ProcessHandle -> IO ExitCode +waitForProcess = waitForProcessConcurrent . ConcurrentProcessHandle |