X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=GHC%2FIO%2FFD.hs;h=b5392d477d1df5ca57b9997d2dbd25eb7c9bc613;hb=41e8fba828acbae1751628af50849f5352b27873;hp=659f610d0b298ddfc0bb7162f951f47b7a0e77cc;hpb=938137ef0feb20656a745ae3e34803de3a825515;p=ghc-base.git

diff --git a/GHC/IO/FD.hs b/GHC/IO/FD.hs
index 659f610..b5392d4 100644
--- a/GHC/IO/FD.hs
+++ b/GHC/IO/FD.hs
@@ -1,6 +1,13 @@
-{-# OPTIONS_GHC -XNoImplicitPrelude -XBangPatterns -fno-warn-identities #-}
+{-# LANGUAGE CPP
+           , NoImplicitPrelude
+           , BangPatterns
+           , ForeignFunctionInterface
+           , DeriveDataTypeable
+  #-}
+{-# OPTIONS_GHC -fno-warn-identities #-}
 -- Whether there are identities depends on the platform
 {-# OPTIONS_HADDOCK hide #-}
+
 -----------------------------------------------------------------------------
 -- |
 -- Module      :  GHC.IO.FD
@@ -99,8 +106,15 @@ instance GHC.IO.Device.IODevice FD where
   dup           = dup
   dup2          = dup2
 
+-- We used to use System.Posix.Internals.dEFAULT_BUFFER_SIZE, which is
+-- taken from the value of BUFSIZ on the current platform.  This value
+-- varies too much though: it is 512 on Windows, 1024 on OS X and 8192
+-- on Linux.  So let's just use a decent size on every platform:
+dEFAULT_FD_BUFFER_SIZE :: Int
+dEFAULT_FD_BUFFER_SIZE = 8096
+
 instance BufferedIO FD where
-  newBuffer _dev state = newByteBuffer dEFAULT_BUFFER_SIZE state
+  newBuffer _dev state = newByteBuffer dEFAULT_FD_BUFFER_SIZE state
   fillReadBuffer    fd buf = readBuf' fd buf
   fillReadBuffer0   fd buf = readBufNonBlocking fd buf
   flushWriteBuffer  fd buf = writeBuf' fd buf