Re: ps shows same process more than once

[Christopher Faylor <cgf-use-the-mailinglist-please@cygwin.com>]

On Thu, Nov 28, 2013 at 02:08:13PM +0100, Corinna Vinschen wrote:
>On Nov 28 15:20, George M. Florendo wrote:
>> Hi,
>> 
>> I run a non cygwin apache process named httpd.exe.  Checking it with
>> "ps -W" shows a listing of the same process (with PID 4560 in this
>> case) twice.
>> 
>> $ ps -W | grep httpd
>>      4560    1604    4560       5304  pty0    1000 09:55:21
>> /home/georgeflorendo/wamp/bin/apache/Apache2.4.4/bin/httpd
>>      4560    1604    4560       5304  pty0    1000 09:55:21
>> /home/georgeflorendo/wamp/bin/apache/Apache2.4.4/bin/httpd
>>      7508       0       0       7508  ?          0 15:09:50
>> C:\cygwin\home\georgeflorendo\wamp\bin\apache\Apache2.4.4\bin\httpd.exe
>> 
>> Doing a "ps aux" shows it only once.
>> 
>> $ ps aux
>>       PID    PPID    PGID     WINPID   TTY     UID    STIME COMMAND
>>      1340    7856    1340       5720  pty5    1000 15:13:50 /usr/bin/ps
>>      1604    4008    1604       2292  pty0    1000 09:17:01 /usr/bin/bash
>>      4008       1    4008       4008  ?       1000 09:17:00 /usr/bin/mintty
>>      4560    1604    4560       5304  pty0    1000 09:55:21
>> /home/georgeflorendo/wamp/bin/apache/Apache2.4.4/bin/httpd
>> 
>> <snipped>
>> 
>> Is it correct that ps -W shows the same process twice?
>
>Not exactly but it could happen.  Can you try the latest snapshot Cygwin
>DLL from http://cygwin.com/snapshots/ and see if it fixes the problem?

I don't see anything in the ChangeLog which would affect this and I'd
be concerned if there was.

There are scenarios where two different windows pids can be associated
with the same Cygwin pid.  You should only see it when you do a "ps -W".

So, AFAICT, the correct answer to the "Is it correct" is "Yes'.

cgf

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