static ethernet

tjoseph1

Here is my script:
#!/usr/bin/env python3
import time
count = 100
while count != 0:
time.sleep(1)
count -= 1

Please see the following observation:

root@Omega-745F:/tmp# free
total used free shared buffers cached
Mem: 124808 55340 69468 348 5760 26592
-/+ buffers/cache: 22988 101820
Swap: 0 0 0

root@Omega-745F:/tmp# start-stop-daemon -b -S -x /tmp/hello.py
root@Omega-745F:/tmp# free
total used free shared buffers cached
Mem: 124808 57252 67556 348 5760 26592
-/+ buffers/cache: 24900 99908
Swap: 0 0 0

root@Omega-745F:/tmp# start-stop-daemon -b -S -x /tmp/hello.py
root@Omega-745F:/tmp# free
total used free shared buffers cached
Mem: 124808 59248 65560 348 5760 26592
-/+ buffers/cache: 26896 97912
Swap: 0 0 0

root@Omega-745F:/tmp# start-stop-daemon -b -S -x /tmp/hello.py
root@Omega-745F:/tmp# free
total used free shared buffers cached
Mem: 124808 61276 63532 348 5760 26592
-/+ buffers/cache: 28924 95884
Swap: 0 0 0

root@Omega-745F:/tmp# ps |grep python
4985 root 5116 S python3 /tmp/hello.py
4989 root 5116 S python3 /tmp/hello.py
4993 root 5116 S python3 /tmp/hello.py
4996 root 1216 S grep python

Obviously, -S is not working, but the scripts exit after 100 seconds.

Thanks..

crispyoz

@Nagarjuna-Reddy @tjoseph1

Why not just run a bash script in the background and the script could execute your python code.

Here is a simple bash (ash) script:

#!/bin/ash
while :
do
echo Looping
sleep 3
done

In your rc.local you can execute it in the background:

./test_loop.sh &

exit 0

tjoseph1

@Nagarjuna-Reddy :
I just modified the one in my above post:

root@Omega-745F:/# cat /etc/rc.local
# Put your custom commands here that should be executed once
# the system init finished. By default this file does nothing.
start-stop-daemon -b -S -x /root/hello.py
exit 0

root@Omega-745F:/# cat /root/hello.py
#!/usr/bin/env python3
import os
import time

if os.path.exists("/tmp/hello.run"):
exit()
else:
f = open("/tmp/hello.run", 'w')
f.close()

count = 100
while count != 0:
time.sleep(1)
count -= 1

os.remove("/tmp/hello.run")

Reboot.. the python scripts executes at the boot from rc.local, it seems

root@Omega-745F:/# ps |grep python
1533 root 5124 S python3 /root/hello.py
1976 root 1216 S grep python

root@Omega-745F:/# ls -l /tmp/hello.run
-rw-r--r-- 1 root root 0 Sep 14 19:33 /tmp/hello.run

root@Omega-745F:/# ps |grep python
1533 root 5124 S python3 /root/hello.py
1981 root 1216 S grep python

root@Omega-745F:/# ls -l /tmp/hello.run
-rw-r--r-- 1 root root 0 Sep 14 19:33 /tmp/hello.run

After 100 seconds..

root@Omega-745F:/# ps |grep python
1984 root 1216 S grep python

root@Omega-745F:/# ls -l /tmp/hello.run
ls: /tmp/hello.run: No such file or directory

I do not know how -S can be seriously implemented from python as laid out in "man start-stop-daemon":
<<
start-stop-daemon is used to control the creation and termination of system-level processes. Using one of the matching options, start-stop-daemon can be configured to find existing instances of a running process.
<<

Once you reach there, post your control code, please.

You can probably use python's try.. except..finally to take care of all the situations at runtime events ?

tjoseph1

@Nagarjuna-Reddy :

You might want to follow @crispyoz's recommendation. Didn't notice @crispyoz's post, my bad.

Thanks..

crispyoz

@tjoseph1 There is usually more than one solution I just prefer bash scripting over python since it is more light weight and has less dependencies. When I hit a wall with scripting I would usually write in C, mainly because I really don't like python.

tjoseph1

@crispyoz :

Me either.. nor python nor js when it comes to microcontrollers. I have done some pandas, though..
There must be a reason for C's rating is on the rising, recently:
https://tiobe.com/tiobe-index/ . But, that is my personal view.

Thanks ..

crispyoz

@tjoseph1 Because all this JS and Python encourages poor code structure. C and C++ in particular encourage structured code. Now watch the flame wars commence

I'm not sure the survey in your link has much veracity given that it places ASM above Objective C, if that were the case I'd probably come out of semi-retirement.

Nagarjuna Reddy

@crispyoz
sir, i have connected ethernet cable directly from my PC to onion. for that, i have given static IP address in onion
config interface 'wan'
option ifname 'eth0'
option proto 'static'
option ipaddr '192.168.1.60'
option netmask '255.255.255.0'

and meantime i am running PPP connection(GSM Modem) using chat comgt. the problem is when i have added python and shell scripts are in /rc.local files are not running in the background and same time reboot function also not working. what could be the issue.?

tjoseph1

<<
the flame wars commence
<<
Like I said, that was my personal view.

IEEE gives different rating:
https://spectrum.ieee.org/computing/software/the-top-programming-languages-2019

I am sure you might have noticed, mentioned by TOIBE:
<<
The ratings are based on the number of skilled engineers world-wide, courses and third party vendors. Popular search engines such as Google, Bing, Yahoo!, Wikipedia, Amazon, YouTube and Baidu are used to calculate the ratings. It is important to note that the TIOBE index is not about the best programming language or the language in which most lines of code have been written.
<<
End of the day, if ones loves the language and tools one uses, and the solution works as designed/expected..then all is well.

Thanks..

crispyoz

@tjoseph1 I agree with you, I use the best tool for the job at hand and after 35+ years of writing software I've seen a lot of fads. Structure, structure, structure.

My comment re the survey is I'm a skeptic at heart, unless I know what the question was, I'll add a pinch of salt to the answer.

crispyoz

@Nagarjuna-Reddy there are a few questions there.

"shell scripts are in /rc.local files are not running in the background"

rc.local is in /etc maybe you can post your rc.local so we can look at it, just ###### out anything you can't share.

To assist in debugging scripts that run in the background ..... or fail to run in the background .... I suggest you uses some logging. To revisit my test script, you can add some new lines for logging:

#!/bin/ash
while :
do
echo "Looping" >> /tmp/loop.log
sleep 3
echo "After sleeping" >> /tmp/loop.log
done

echo "I just bailed out" >> /tmp/loop.log

After a minute or so run cat /tmp/loop.log then you can see if the loop actually ran and how many times.

tjoseph1

@crispyoz :
Thanks.. if its that, ASM happened to be on the top..because there were more searches on ASM, than ObjC..that would make you smile ?

crispyoz

@tjoseph1 Could also be typos in searches

tjoseph1

@crispyoz :
Possible..but between ASM n ObjC? I for one have searched ASM..but never ObjC.. & I guess veterans like you, either do not, or if you do, it would be more on the ASM side

crispyoz

@tjoseph1 I don't search for ASM, but I might search for "why NeXT failed" and by implication, why we have objective c

tjoseph1

@crispyoz :
Why warp failed is another mystery. Warp4 with the tabbed UI was much better/stable than w95. Why mips origin/octane/onyx failed after leading the innovation at ilm, pixar is another mystery..may be those were ahead of their right time.

crispyoz

@tjoseph1 Don't start me on that topic. Why do you think Billy and his babe are donating toilets to the huddled masses? Guilt has a way of gnawing away at your soul.

tjoseph1

@crispyoz :
This is my observation :
Had he completed Harward, world wouldn't have had broken windows..

The MRE in sgi mips architecture was a break through(the entire hardware works like a pointer), supported by 80Gbps interconnect let the world watch general pupose processor generated animations, 30 yrs back. Though I am junior by all means, I too feel, innovations were sacked.