Streamly.Internal.System.Process.Posix

Processes

data Process

Thread safe, mutable process handle. Process status is stored in the handle and is modified by the process inspection operations.

newProcess

Arguments

:: IO ()

Execute after fork, before exec

-> FilePath

Executable path

-> [String]

Arguments

-> Maybe [(String, String)]

Environment

-> IO Process

Creates a new process, executes the specified action in the cloned process and then performs an exec system call using the provided path, arguments and environment. The PATH is searched for the specified binary when the specified path is not absolute?

wait :: Process -> IO ProcessStatus

Wait until the process exits by itself or gets terminated due to a signal. Returns the ProcessStatus which includes the termination reason or exit code.

Thread safe.

getStatus :: Process -> IO (Maybe ProcessStatus)

Get the current status of a process. A Nothing value means the process is still running, a Just value means the process is terminated and provides the status of the process.

Thread safe.

IPC

mkPipe :: Direction -> IO (Fd, Fd, (IO (), IO (), IO ()))

return (parent, child, (parentAction, childAction, failureAction))

mkStdioPipes :: Bool -> IO ((Handle, Handle, Maybe Handle, Handle, Handle), IO (), IO (), IO ())