[xmonad] darcs patch: get rid of zombies in a more portable way

[wagnerdm at seas.upenn.edu]

Perhaps Jan could be given commit bit...
~d

Quoting Don Stewart <dons at galois.com>:

> Jan.Vornberger:
>> On Sun, Apr 11, 2010 at 09:03:13PM +0200, Tomas Janousek wrote:
>> > Sun Apr 11 20:55:10 CEST 2010  Tomas Janousek <tomi at nomi.cz>
>> >   * get rid of zombies in a more portable way
>> >
>> >   FreeBSD and OpenBSD don't support the signal(SIGCHLD, SIG_IGN)  
>> way of dealing
>> >   with them. Wikipedia quote on the issue:
>> >
>> >   "POSIX.1-2001 allows a parent process to elect for the kernel  
>> to automatically
>> >   reap child processes that terminate by setting the disposition  
>> of SIGCHLD to
>> >   SIG_IGN or by setting the SA_NOCLDWAIT flag for the SIGCHLD  
>> signal; Linux 2.6
>> >   kernels adhere to this behavior while FreeBSD supports only the  
>> latter of
>> >   these methods. Because of historical differences between System  
>> V and BSD
>> >   behaviors with regard to ignoring SIGCHLD, calling wait remains the most
>> >   portable paradigm for cleaning up after forked child processes."
>>
>> A quick patch review: I played around with this and it seems to work
>> fine in my testings and is a sound alternative to the current way of
>> just ignoring the signal. If this solves issues for FreeBSD and OpenBSD
>> I'm all for it. My thumbs up for applying this, Don and Spencer. :-)
>>
>
> Interesting. Thanks for taking the time to check this.
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