How to get a specific PID #

rikona rikona at sonic.net
Thu Dec 31 03:06:58 UTC 2015


Wednesday, December 30, 2015, 1:14:53 PM, Ralf wrote:

> On Wed, 30 Dec 2015 21:57:24 +0100, I wrote:
>>On Wed, 30 Dec 2015 22:20:28 +0200, Amichai Rotman wrote: 
>>>Just use the 't' key to switch htop to 'tree mode'.  
>>
>>How does this show what xfw window belongs to what PID?
>>
>>  1  [||                                        2.8%]     Tasks: 59,
>> 83 thr; 1 running 2  [|||
>> 4.2%]     Load average: 0.03 0.04 0.05
>> Mem[||||||||||||||||||||||||||||||||||||840/3704MB]     Uptime: 2
>> days, 21:45:15 Swp[|                                    19/4706MB]
>>
>>  PID USER      PRI  NI  VIRT   RES   SHR S CPU% MEM%   TIME+  Command
>> 7665 rocketmou  20   0  123M 14020 11652 S  0.0  0.4  0:00.19 ├─ xfw
>> 7663 rocketmou  20   0  123M 13960 11592 S  0.0  0.4  0:00.14 ├─ xfw

> By the following example you can see, when using wmctrl I can see what
> instance of pluma, IOW what window, belongs to what PID, but for xfw the
> PIDs aren't displayed correctly. As shown by an earlier reply, even if
> window title bars should share the same name, it's possible to change
> the name with wmctrl, but this only makes sense, if it also displays the
> PID.

> $ ps aux|grep -v grep|grep xfw
> rocketm+ 28733  0.2  0.3 126964 13836 pts/4    S+   14:25   0:00 xfw
> root     28734  0.0  0.1  72312  5216 pts/3    S+   14:26   0:00 sudo xfw
> root     28735  0.2  0.3 127744 14220 pts/3    S+   14:26   0:00 xfw
> $ ps aux|grep -v grep|grep pluma
> rocketm+ 28736  4.0  1.0 625936 40996 pts/2    Sl+  14:26   0:03 pluma
> root     28741  0.0  0.1  72312  5112 pts/1    S+   14:26   0:00 sudo pluma
> root     28742  3.1  0.8 991168 32152 pts/1    Sl+  14:26   0:01 pluma
> $ wmctrl -lp
> 0x00a00003 -1 25836  archlinux panel
> 0x00e0001d -1 25835  archlinux panel
> 0x00800007  0 28670  archlinux rocketmouse at archlinux:~
> 0x014004be  0 0            N/A .jackdrc - /home/rocketmouse
> 0x018004bf  0 0            N/A .bashrc - /root
> 0x01a00114  0 28736  archlinux .jackdrc (~) - Pluma
> 0x01c00110  0 28742  archlinux .bashrc (~) - Pluma


wmctrl -lp does display the title bar BUT the PIDs in wmctrl are
different from *most* of what is given by top, so it's a bit more
difficult to get the correct PID to kill.

Top lists many more PIDs than wmctrl - it seems that each tab in kate
has a different PID - this seems to account for the difference in the
# of PIDs displayed. Other pgms display multiple tabs in a window that
has only one PID, so different pgms work in different ways.

If I look in htop in tree mode it looks as though the extra tabs are
listed as children to the main window PID. It looks like wmctrl
displays only one PID for the kate 'window' which actually contains
multiple PIDs. But, the # displayed IS the parent window PID, so this
can give me the PID I need to kill the window.

If I do kill the 'parent' kate PID, would that also kill the children
kate PIDs? If it would, is there a way to keep AND access the
children, and just kill the parent? And, if I kill a children window,
will that also kill the parent?

Thanks much for the help!

-- 

 rikona        




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