[GHC] #7229: Detecting if a process was killed by a signal is impossible

[GHC]

#7229: Detecting if a process was killed by a signal is impossible
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    Reporter:  benmachine         |       Owner:                  
        Type:  bug                |      Status:  new             
    Priority:  high               |   Milestone:  7.6.2           
   Component:  libraries/process  |     Version:                  
    Keywords:                     |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple   |     Failure:  None/Unknown    
  Difficulty:  Unknown            |    Testcase:                  
   Blockedby:                     |    Blocking:                  
     Related:                     |  
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Changes (by simonmar):

  * priority:  normal => high
  * difficulty:  => Unknown
  * milestone:  => 7.6.2


Comment:

 I have adopted the shell convention of using 128 + signal number as the
 exit status for a process that died due to a signal.  Symbolic constants
 for the signal names are available from `System.Posix.Signals`.  I've also
 fixed the slightly strange behaviour of `getProcessExitCode` - I dug
 through the logs a bit, but the current code goes back a long way and I
 couldn't find the reason for fixing `EINTR`.

 Would anyone object to this going into 7.6.2?  There is a semantic change,
 but it is very unlikely that anyone was depending on the old behaviour.
 We would need a minor version bump to `process` so that clients can
 conditionally depend on the new behaviour.

 patches to `process` package:

 {{{
 commit 54038240284b11ad4117ca075fa2292f5069bc45
 Author: Simon Marlow <marlowsd at gmail.com>
 Date:   Mon Sep 24 09:50:24 2012 +0100

     Use (128+signal) as the exit code when a proc terminates due to a
 signal (#7229)

 commit 9547cf40ac1ddcd471a8ce75f927b382a82c1038
 Author: Simon Marlow <marlowsd at gmail.com>
 Date:   Mon Sep 24 12:11:14 2012 +0100

     Test for #7229

 commit 007fb056f2e77e65196de4bff94ea001e69a12eb
 Author: Simon Marlow <marlowsd at gmail.com>
 Date:   Mon Sep 24 12:27:43 2012 +0100

     Documentation for signal exit codes (#7229)
 }}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7229#comment:3>
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