[GHC] #15715: problematic openFile with named pipes

[GHC]

#15715: problematic openFile with named pipes
-------------------------------------+-------------------------------------
        Reporter:  adp               |                Owner:  (none)
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  libraries/base    |              Version:  8.4.3
      Resolution:  invalid           |             Keywords:
Operating System:  Linux             |         Architecture:  x86_64
 Type of failure:  Incorrect result  |  (amd64)
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by adp):

 Thanks for the answer, very helpful!

 Given in the future some people might have the same problem I had,
 shouldn't the docs be updated?
 Currently it says:


 > This operation may fail with:
 >
 > - `isAlreadyInUseError` if the file is already open and cannot be
 reopened;
 > - `isDoesNotExistError` if the file does not exist; or
 > - `isPermissionError` if the user does not have permission to open the
 file.


 Not mentioning that one could get `isDoesNotExistError` by other reason
 than the file not
 existing, like in this case.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15715#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler