__  _____   _____ __ __ ________    __       _______________  ________ 
   / / / /   | / ___// //_// ____/ /   / /      / ___/_  __/ __ \/  _/ __ \
  / /_/ / /| | \__ \/ ,<  / __/ / /   / /       \__ \ / / / / / // // / / /
 / __  / ___ |___/ / /| |/ /___/ /___/ /___    ___/ // / / /_/ // // /_/ / 
/_/ /_/_/  |_/____/_/ |_/_____/_____/_____/   /____//_/ /_____/___/\____/

# on debian/ubuntu, make sure to use 1.x
apt-get install libuv1-dev  libuv1

# on MacOS, we recommend brew
brew install libuv

...

git clone https://github.com/libuv/libuv.git 
cd libuv 
git checkout tags/v1.24.0   # depend on your own need, any version >= 1.14 will work.
sh autogen.sh 
./configure 
make 
sudo make install 

cabal install stdio

import Std.IO.StdStream
import qualified Std.Data.Text as T

main = do
    -- read stdin and write to stdout, but with our new IO manager!
    input <- readLineStd
    printStd (T.validate input)

import Std.IO.TCP
import Std.IO.Buffered
import Control.Monad

main = do
    startServer defaultServerConfig
        { serverAddr = SockAddrInet 8888 inetAny
        , serverWorker = echo
        }
  where
    echo uvs = forever $ do
        i <- newBufferedInput uvs 4096
        o <- newBufferedOutput uvs 4096
        readBuffer i >>= writeBuffer o
        flushBuffer o

import Std.IO.Logger
import qualified Std.Data.Builder as B
import Control.Concurrent

main = withStdLogger $ do
    debug $ "hello world! PI ~=" >> B.double pi     -- debug level won't be immediately flushed
    forkIO $ do
        fatal "fatal message will trigger a log flush"

import           Std.IO.FileSystem
import           Std.IO.Resource
import           Std.IO.StdStream

main = do
    -- create a temp directory
    tempdir <- mkdtemp "temp"   
    let filename = "temp" <> "/test"
        flags = O_RDWR .|. O_CREAT      -- create if not exist
        mode = DEFAULT_MODE

    -- file is a 'Resource', use 'withResource' to automatically manage it
    withResource (initUVFile filename flags mode) $ \ f -> do
        o <- newBufferedOutput file 4096
        writeBuffer o "hello world!"
        flushBuffer o

    stat filename >>= printStd