[GHC] #1315: System.Process.runInteractiveProcess needs a way to pipe just some handles

[GHC]

#1315: System.Process.runInteractiveProcess needs a way to pipe just some handles
-------------------------------+--------------------------------------------
  Reporter:  simonmar          |          Owner:         
      Type:  task              |         Status:  new    
  Priority:  normal            |      Milestone:  6.8    
 Component:  libraries/base    |        Version:  6.6.1  
  Severity:  normal            |       Keywords:         
Difficulty:  Moderate (1 day)  |             Os:  Unknown
  Testcase:                    |   Architecture:  Unknown
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Currently `runInteractiveProcess` attaches pipes to all 3 standard
 handles.  Sometimes it's necessary to attach pipes to a subset, and
 possibly pass in existing Handles for the others.  For example this could
 be used to connect a sequence of processes together with pipes.  Also see
 Distribution.Simple.Utils.rawSystemStdout.

 While we're here, we could add a more convenient popen-like API.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1315>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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