patch applied (packages/base): Windows: map ERROR_NO_DATA to EPIPE, rather than EINVAL

[Simon Marlow]

Wed Sep 15 07:26:18 PDT 2010  Simon Marlow <marlowsd at gmail.com>
  * Windows: map ERROR_NO_DATA to EPIPE, rather than EINVAL
  WriteFile() returns ERROR_NO_DATA when writing to a pipe that is
  "closing", however by default the write() wrapper in the CRT maps this
  to EINVAL so we get confusing things like
  
    hPutChar: invalid argument (Invalid Argumnet)
  
  when piping the output of a Haskell program into something that closes
  the pipe early.  This was happening in the testsuite in a few place.
  
  The solution is to map ERROR_NO_DATA to EPIPE correctly, as we
  explicitly check for EPIPE on stdout (in GHC.TopHandler) so we can
  exit without an error in this case.

    M ./GHC/IO/FD.hs -1 +13
    M ./cbits/Win32Utils.c -1 +4

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=packages/base;a=darcs_commitdiff;h=20100915142618-12142-979682426a4cf44d28897a2aa44bc09fcf35a38e.gz