[SOLVED] Launching sh scripts (dzen2 bar) from xinitrc, multiple proc

valvet · 2010-08-11 13:06:56

Hi

I launch some SH from .xinitrc, but they appear multiple times and I cannot figure out why.

This is how I do, from .xinitrc - running xmonad:

# start dzen2 scripts
./dev/dzen2/scripts/rtop.sh &
./dev/dzen2/scripts/rbottom.sh &
./dev/dzen2/scripts/lbottom.sh &

When I look in the process list (ps aux | grep sh) I get this result:

michael   7184  0.0  0.0      0     0 tty1     Z    11:19   0:00 [sh] <defunct>
michael   7186  0.0  0.0   6060  1360 tty1     S    11:19   0:00 /bin/bash ./dev/dzen2/scripts/rtop.sh
michael   7187  0.0  0.0   6060  1324 tty1     S    11:19   0:00 /bin/bash ./dev/dzen2/scripts/rbottom.sh
michael   7188  0.0  0.0   6060  1320 tty1     S    11:19   0:00 /bin/bash ./dev/dzen2/scripts/lbottom.sh
michael   7190  0.0  0.0   6064   788 tty1     S    11:19   0:00 /bin/bash ./dev/dzen2/scripts/rbottom.sh
michael   7199  0.2  0.0   6320  1104 tty1     S    11:19   0:34 /bin/bash ./dev/dzen2/scripts/rtop.sh
michael   7480  0.0  0.0   6064   840 tty1     S    11:19   0:00 /bin/bash ./dev/dzen2/scripts/lbottom.sh

Example script:

source "/home/michael/dev/dzen2/scripts/settings.sh"

while :
do
    echo -e "  ^fg($MYCOLORBLUE)^i($ICONPATH/shroom.xbm)^fg($MYCOLORWHITE)  $(uname -r | tr '[A-Z]' ['a-z'])"
    sleep 300 
done | /usr/bin/dzen2 -ta l -h 20 -w 900 -y 800 -fg '#c4c4c4' -fn "$FONT"

Any ideas as to why they're launched twice?

Thanks!

Last edited by valvet (2010-11-08 14:50:47)

mikesd · 2010-08-11 13:27:18

Any chance your .xinitrc is being sourced twice? What does your .xinitrc look like? How are you starting X?

valvet · 2010-08-11 13:33:24

Hey, thanks for responding.

I run X automatically, when logging in at tty1, like so:

# startx when logging into tty1
if [[ -z "$DISPLAY" ]] && [[ $(tty) = /dev/tty1 ]]; then
    . startx
    logout
fi

My .xinit looks like this:

michael@princess ~> cat .xinitrc 
# start terminal emulation daemon
urxvtd -q -o -f &

# [url]http://wiki.archlinux.org/index.php/Per_Application_Transparency[/url]
#xcompmgr &
#devilspie -a &

# set keyboard language, and enable restart X
setxkbmap dk -option terminate:ctrl_alt_bksp &

# set the cursor
xsetroot -cursor_name left_ptr

# set wallpaper
sh /home/michael/.fehbg &

# hide mouse when not needed
unclutter -idle 1 &

# start dzen2 scripts
./dev/dzen2/scripts/rtop.sh &
./dev/dzen2/scripts/rbottom.sh &
./dev/dzen2/scripts/lbottom.sh &

# start xmonad
exec ck-launch-session dbus-launch --exit-with-session xmonad

I don't know when .xinit is sourced, but I imagine it happens when X is started, using startx? I've not sourced it manually anywhere.

- m

mikesd · 2010-08-11 22:29:30

Weird. Can't see any issues with that. Perhaps you could add a line to your .xinitrc such as:

echo "XXX" >> /home/michael/dummy

and see if it is in fact being sourced twice.

Perhaps the duplicates are from a previous login? Do they get killed when you logout? Do they still appear after a reboot and login?

valvet · 2010-08-11 22:32:10

mikesd wrote:

Weird. Can't see any issues with that. Perhaps you could add a line to your .xinitrc such as:
echo "XXX" >> /home/michael/dummy
and see if it is in fact being sourced twice.
Perhaps the duplicates are from a previous login? Do they get killed when you logout? Do they still appear after a reboot and login?

That's a good test, I'll try that :-)

valvet · 2010-08-11 22:52:20

I did what you said, and echo'ed some stuff in .xinitrc - it only gets echoed once :-(.. this is weird. Can it have something to do with the loops inside my scripts? See example script I posted earlier.

Once I logout (using ctrl+alt+del), no bash processes exists, so the scripts are closed - they get doubled once I login to X.

Thanks for helping :-)

- m

Knute · 2010-08-12 00:39:19

What does your /home/michael/dev/dzen2/scripts/settings.sh look like?

valvet · 2010-08-12 08:47:04

Hi Knute

Well, it looks like this:

#!/bin/bash
# vim:ft=bash ts=4
#

FONT='xft:Droid Sans Mono:style=Regular:pixelsize=11:antialias=true:hinting=true:hintstyle=hintfull'
ICONPATH='/usr/share/icons/sm4tik'

MYCOLORBLACK='#000000'
MYCOLORWHITE='#ffffff'
MYCOLORBLUE='#d5767e'
MYCOLORGRAY='#484848'
MYCOLORGRAYDARK='#b8bcb8'
MYCOLORGRAYALT='#c4c4c4'
MYCOLORRED='#ff6565'

But this also happened when I diden't have a settings file :x

knopwob · 2010-08-12 09:29:41

maybe you can get some hints by looking at the parent ids of your scripts, to see what process started them

valvet · 2010-08-12 10:38:09

knopwob wrote:

maybe you can get some hints by looking at the parent ids of your scripts, to see what process started them

It looks like this:

http://omploader.org/vNTd3Zg

As I can make out, it seems that lbottom.sh is launching another lbottom.sh? Before dzen.

Thanks :-)

- m

mikesd · 2010-08-12 11:28:14

Hmmm. It is the script itself. I get the same outcome, two instances of the script, with:

#!/bin/bash

while :
do
    echo "XXX"
    sleep 300
done | dzen2

I'm guessing it is something to do with subshells though I'm not exactly sure what.

valvet · 2010-08-12 11:34:05

mikesd wrote:

Hmmm. It is the script itself. I get the same outcome, two instances of the script, with:
#!/bin/bash

while :
do
    echo "XXX"
    sleep 300
done | dzen2 
I'm guessing it is something to do with subshells though I'm not exactly sure what.

Interesting :-).. it doesn't really bother me, but I just assume it's using double the resources. My rtop script for example is sleeping every 1 sec (has time/date printing out), if two of those are running at the same time, that's not ideal :x.

Well, hopefully someone can figure out why, based on your findings above :-)

Thanks!

- m

valvet · 2010-08-13 09:20:23

Hi again.

I should mention that this also happens when the scripts are zsh instead of sh. Odd!

knopwob · 2010-08-13 09:53:55

hey,

i just did some reading and figured out, that both sites of a pipe are executed in their own subshell. So the second process with the same name is basically just the subshell executing the while-loop. So nothing to worry ;-)

Last edited by knopwob (2010-08-13 09:54:27)

mikesd · 2010-08-13 10:32:26

Ah. Was this "reading" in the BASH man page?

knopwob · 2010-08-13 11:20:14

mikesd wrote:

Ah. Was this "reading" in the BASH man page?

nope, a book about shell programming lying next to me.

valvet · 2010-08-13 21:50:13

knopwob wrote:

hey,
i just did some reading and figured out, that both sites of a pipe are executed in their own subshell. So the second process with the same name is basically just the subshell executing the while-loop. So nothing to worry ;-)

Ah excellent, knopwob. Thank you for your help, and everyone else also :-).

Love this community.

- m

jasonwryan · 2010-08-14 02:37:22

valvet wrote:

Love this community.

Then please give some back and mark the thread as solved: it will make it easier for others to find the solution in future...
http://wiki.archlinux.org/index.php/For … ow_to_Post

milomouse · 2010-08-17 16:56:39

good to hear you fixed the problem. as a side note, there's also "XMonad.Util.SpawnOnce" in xmonad-contrib-darcs that may do what you want. it's what i use for my external dzen scripts (i used to start them from .xinitrc before i found this).

Arch Linux

#1 2010-08-11 13:06:56

[SOLVED] Launching sh scripts (dzen2 bar) from xinitrc, multiple proc

#2 2010-08-11 13:27:18

Re: [SOLVED] Launching sh scripts (dzen2 bar) from xinitrc, multiple proc

#3 2010-08-11 13:33:24

Re: [SOLVED] Launching sh scripts (dzen2 bar) from xinitrc, multiple proc

#4 2010-08-11 22:29:30

Re: [SOLVED] Launching sh scripts (dzen2 bar) from xinitrc, multiple proc

#5 2010-08-11 22:32:10

Re: [SOLVED] Launching sh scripts (dzen2 bar) from xinitrc, multiple proc

#6 2010-08-11 22:52:20

Re: [SOLVED] Launching sh scripts (dzen2 bar) from xinitrc, multiple proc

#7 2010-08-12 00:39:19

Re: [SOLVED] Launching sh scripts (dzen2 bar) from xinitrc, multiple proc

#8 2010-08-12 08:47:04

Re: [SOLVED] Launching sh scripts (dzen2 bar) from xinitrc, multiple proc

#9 2010-08-12 09:29:41

Re: [SOLVED] Launching sh scripts (dzen2 bar) from xinitrc, multiple proc

#10 2010-08-12 10:38:09

Re: [SOLVED] Launching sh scripts (dzen2 bar) from xinitrc, multiple proc

#11 2010-08-12 11:28:14

Re: [SOLVED] Launching sh scripts (dzen2 bar) from xinitrc, multiple proc

#12 2010-08-12 11:34:05

Re: [SOLVED] Launching sh scripts (dzen2 bar) from xinitrc, multiple proc

#13 2010-08-13 09:20:23

Re: [SOLVED] Launching sh scripts (dzen2 bar) from xinitrc, multiple proc

#14 2010-08-13 09:53:55

Re: [SOLVED] Launching sh scripts (dzen2 bar) from xinitrc, multiple proc

#15 2010-08-13 10:32:26

Re: [SOLVED] Launching sh scripts (dzen2 bar) from xinitrc, multiple proc

#16 2010-08-13 11:20:14

Re: [SOLVED] Launching sh scripts (dzen2 bar) from xinitrc, multiple proc

#17 2010-08-13 21:50:13

Re: [SOLVED] Launching sh scripts (dzen2 bar) from xinitrc, multiple proc

#18 2010-08-14 02:37:22

Re: [SOLVED] Launching sh scripts (dzen2 bar) from xinitrc, multiple proc

#19 2010-08-17 16:56:39

Re: [SOLVED] Launching sh scripts (dzen2 bar) from xinitrc, multiple proc

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