System.Posix.User.getGroupEntryForName incorrect error for non-existent group

The following program:

  import System.Posix.User
  main :: IO ()
  main = getGroupEntryForName "monkeys" >> return ()

gives the following output (on a system without a "monkeys" group):

  *** Exception: getGroupEntryForName: failed (Success)

The "(Success)" part is obviously wrong.

The problem is that the getGroupEntryForName implementation throws errno if getgrnam_r wrote NULL to the pointer pointed to by its last parameter, while the getgrnam_r specification makes no guarantees about errno being set in that case.

Trac metadata

Trac field	Value
Version	6.6.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	libraries/unix
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