Question about rad_fork

Alan DeKok aland at
Thu Feb 1 14:55:32 CET 2007

Garber, Neal wrote:
> While reviewing rad_fork, as part of an enhancement I’m working on, I
> found something questionable.

  Most of that code is pretty bad, unfortunately.

>  After the call to fork, it tests if
> child_pid != 0 (to see if the parent is the process executing, I
> presume).  If true, then, the child_pid is added to the thread pool and
> the thread pool mutex is unlocked.  However, if the fork failed, -1 is
> returned (and stored in child_pid), which I believe will then be added
> to the thread pool (because -1 != 0 and there isn’t an explicit test for
> fork success/failure).  Shouldn’t there be a test for fork success
> (child_pid > 0) before adding to the thread pool?


>  Perhaps this isn’t a
> big deal because fork probably doesn’t fail that often.  But, it isn’t
> clear to me what would happen in reap_children when it calls waitpid
> with -1 as this tells waitpid to return status for any child.
> Am I missing something?  If not, and you want me to submit a bug report
> with the minor code change, let me know..

  No, just send a patch to the list.

  Alan DeKok.
--       - The web site of the book - The blog

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