[GHC] #724: tee complains if used in a process started by ghc

[GHC]

#724: tee complains if used in a process started by ghc
-------------------------------+--------------------------------------------
  Reporter:  guest             |          Owner:         
      Type:  bug               |         Status:  new    
  Priority:  normal            |      Milestone:  6.6    
 Component:  libraries/base    |        Version:  6.4.1  
  Severity:  normal            |     Resolution:         
  Keywords:                    |             Os:  Unknown
Difficulty:  Moderate (1 day)  |   Architecture:  Unknown
-------------------------------+--------------------------------------------
Changes (by simonmar):

  * difficulty:  Unknown => Moderate (1 day)
  * component:  Compiler => libraries/base
  * milestone:  => 6.6

Comment:

 We know why this is: it's because GHC puts stdin/stdout into non-blocking
 mode, and tee doesn't like it.

 There's a fix for the threaded RTS.  We could avoid putting the standard
 file descriptors into non-blocking mode, and instead make blocking FFI
 calls to access them.  This can't be used in the non-threaded RTS.  (GHC
 is now linked with the threaded RTS, so this would fix the case in this
 bug report).

 It's not a simple fix, so I'll probably punt until 6.6.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/724>
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