System.Process.Popen

Documentation

popen :: String -> PopenMode -> IO CStream

Creates a stream, analog of C's popen

pclose :: CStream -> IO (Either () CInt)

Closes a stream. Returns `Left ()` if the status code is -1 and the status code otherwise.

fileno :: CStream -> IO CInt

Gets the file descriptor number from the stream.

data CStream

data PopenMode

Constructors

R

W

Instances

Eq PopenMode

Methods

(==) :: PopenMode -> PopenMode -> Bool

(/=) :: PopenMode -> PopenMode -> Bool

Show PopenMode

Methods

showsPrec :: Int -> PopenMode -> ShowS

show :: PopenMode -> String

showList :: [PopenMode] -> ShowS

withCStream :: CStream -> (Ptr () -> IO a) -> IO a