"ps -e" without procfs(5)

[Mikolaj Golub]

On Wed, 9 Nov 2011 14:53:29 +0200 Kostik Belousov wrote:

 >> And now you return success and nothing gets copied out for the process
 >> in P_INEXEC state. Either you should return an error like EAGAIN, or
 >> consider the P_INEXEC state as transitional and wait till process
 >> leaves it. Or, ignore the state as it was before, and return whatever
 >> error proc_rwmem generated (my preference).

 KB> Forgot to say that the check does not change much because you drop
 KB> process lock immediately after the check, so the process may enter
 KB> the INEXEC state right after the check. I believe you already tried
 KB> to do this with P_WEXIT.

Good point :-). Although after adding the P_INEXEC I have not seen errors any
more, while before they were often (when running 'procstat -ca' in loop and
building world simultaneously). Thus it looks like the probability is much
smaller.

So, it still looks good for me to check for P_INEXEC and return EAGAIN, and
add the comment why we do this and that it still racy. But if you still think
that ignoring the state is the best option no problems for me to return it
back.

-- 
Mikolaj Golub