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|
{-# LANGUAGE CPP #-}
import Control.Concurrent
import Control.Monad
import GHC.Clock
import System.Environment
import System.Exit
import System.IO
import System.Process
import System.Timeout
-- IMPORTANT: Re-run this test _manually_ on windows if/when you change
-- the code in `libraries/base/cbits/inputReady.c` that mentions
-- `FILE_TYPE_CHAR`. Only when you run the code manually, in cmd.exe
-- or PowerShell, does this code path get activated.
-- Running this code in mintty does not count.
main :: IO ()
main = do
args <- getArgs
case args of
[] -> do
let cp =
(shell
((if isLinuxHost
then ("./" ++)
else id)
"hWaitForInput-accurate-stdin --read-from-stdin"))
{std_in = CreatePipe}
(_, _, _, ph) <- createProcess cp
waitForProcess ph >>= exitWith
("--read-from-stdin":_) -> do
let nanoSecondsPerSecond = 1000 * 1000 * 1000
let milliSecondsPerSecond = 1000
let timeToSpend = 1
let timeToSpendNano = timeToSpend * nanoSecondsPerSecond
let timeToSpendMilli = timeToSpend * milliSecondsPerSecond
start <- getMonotonicTimeNSec
b <- hWaitForInput stdin timeToSpendMilli
end <- getMonotonicTimeNSec
let timeSpentNano = fromIntegral $ end - start
let delta = timeSpentNano - timeToSpendNano
-- We can never wait for a shorter amount of time than specified
putStrLn $ "delta >= 0: " ++ show (delta >= 0)
_ -> error "should not happen."
isLinuxHost :: Bool
#if defined(mingw32_HOST_OS)
isLinuxHost = False
#else
isLinuxHost = True
#endif
|
