Re: CVS commit: src/usr.bin/pkill

[Warner Losh <imp%bsdimp.com@localhost>]

On Nov 21, 2012, at 1:55 PM, David Laight wrote:

> On Wed, Nov 21, 2012 at 01:36:01PM -0700, Warner Losh wrote:
>>>> Is pkill() guaranteed to do an atomic traversal of the process list?
>>>> So it will kill something that keeps using fork() to change its pid.
>>> 
>>> I don't think our libkvm offers that.
>> 
>> How could you guarantee this short of moving this into the kernel
>> so you could do all the comparisons while keeping all forks from happening?
> 
> You probably can't ...
> Even in the kernel it might be 'interesting'.

Agreed.  It was a leading question.  Even with help from the kernel, it would 
be difficult....

Warner