[GHC] #12795: Add more types to System.Posix.Types

[GHC]

#12795: Add more types to System.Posix.Types
-------------------------------------+-------------------------------------
        Reporter:  DanielG           |                Owner:  DanielG
            Type:  feature request   |               Status:  closed
        Priority:  normal            |            Milestone:  8.2.1
       Component:  libraries/base    |              Version:
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2664
       Wiki Page:                    |
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Comment (by Ryan Scott <ryan.gl.scott@…>):

 In [changeset:"513eb6a0638a1c64b9d76bcab39ed80cdd9dbb27/ghc"
 513eb6a0/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="513eb6a0638a1c64b9d76bcab39ed80cdd9dbb27"
 Fix #12998 by removing CTimer

 Summary:
 CTimer is a wrapper around `timer_t`, which is a typedef for `void*`
 on most platforms. The issue is that GHC's `FPTOOLS_CHECK_HTYPE` is not
 robust
 enough to discern pointer types from non-pointer types, so it mistakenly
 labels
 `timer_t` as a `Double` or `Int32` (depending on how many bits a pointer
 takes
 up on your platform). This wreaks havoc when trying to give it certain
 type
 class instances, as noted in
 https://phabricator.haskell.org/rGHCffc2327070dbb664bdb407a804121eacb2a7c734.

 For now, the simplest thing to do would be removing `CTimer`, since:

 1. The original author (@DanielG) didn't have a particular use in mind for
    `timer_t` when he fixed #12795.
 2. `CTimer` hasn't appeared in a release of `base` yet.

 Fixes #12998.

 Reviewers: austin, hvr, bgamari, DanielG, trofi

 Reviewed By: bgamari, trofi

 Subscribers: thomie, DanielG, erikd

 Differential Revision: https://phabricator.haskell.org/D2876

 GHC Trac Issues: #12795, #12998
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12795#comment:6>
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