[SR-Users] Kill child process created by app_python module

[Henning Westerholt]

Hello,

not a KEMI python expert, but what you are trying to do (adding a process to Kamailio and then also maintaining it during run-time) could be probably better done from the C module level.
You can look to the several modules that starts their own children worker processes to get an idea how to do it.

Cheers,

Henning

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Henning Westerholt – https://skalatan.de/blog/
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From: sr-users <sr-users-bounces at lists.kamailio.org> On Behalf Of Marat Gareev
Sent: Wednesday, October 26, 2022 12:19 PM
To: miconda at gmail.com
Cc: Kamailio (SER) - Users Mailing List <sr-users at lists.kamailio.org>
Subject: Re: [SR-Users] Kill child process created by app_python module

Hello again,

Any advice will be appreciated.

Thanks

чт, 15 сент. 2022 г. в 18:10, Marat Gareev <maratkin94 at gmail.com<mailto:maratkin94 at gmail.com>>:
Hello Daniel,

Probably, the process is not killed, because the child processes of the python module are not included in the kamailio children list.

How can I register an event route in KEMI script?
Doc<https://kamailio.org/docs/tutorials/devel/kamailio-kemi-framework/kemi/#python-kemi-interpreter> says:
event route callback - the name of the Python function to be executed instead of module specific event_route blocks is provided via event_callback parameter of that module
but evrexec<https://www.kamailio.org/docs/modules/devel/modules/evrexec.html> doesn't have an event_callback parameter.

I tried to set up exec parameter (_update is Python function)
modparam("evrexec", "exec", "name=_update;workers=1;")
and got warning
WARNING: evrexec [evrexec_mod.c:180]: evrexec_process(): empty event route block [_update]


ср, 14 сент. 2022 г. в 16:21, Daniel-Constantin Mierla <miconda at gmail.com<mailto:miconda at gmail.com>>:

Hello,

not sure I got right what is the issue and what would be a solution for it, but maybe you can leverage evrexec to create a child process and by that keep it in kamailio children list.

Cheers,
Daniel
On 13.09.22 19:15, Marat Gareev wrote:
Hello!

I'm trying to use app_python module to perform periodic actions.

This is a simple python code
def _update():
while True:
_action()
time.sleep(60)
class noop_handler:
def child_init(self, rank):
return 0
def ksr_request_route(self, msg):
return 1
def mod_init():
# signal.signal(signal.SIGTERM, signal.default_int_handler)
proc = multiprocessing.Process(target=_update)
# proc.daemon = True
proc.start()
ksr.notice('Forked process {} to update\n'.format(proc.pid))
return noop_handler()

After killing kamailio processes with SIGTERM signal (killall kamailio) I see zombie process.
And if I try to process the signal in daemon mode (see the comments in the snippet above), I get critical errors in the logs and still see processes:
0(37001) NOTICE: <core> [core/kemi.c:124]: sr_kemi_core_notice(): Forked process 37002 to update
1(37003) ERROR: <core> [core/udp_server.c:464]: udp_rcv_loop(): recvfrom:[4] Interrupted system call
Process Process-1:
Traceback (most recent call last):
File "/usr/lib64/python2.7/multiprocessing/process.py", line 258, in _bootstrap
self.run()
File "/usr/lib64/python2.7/multiprocessing/process.py", line 114, in run
self._target(*self._args, **self._kwargs)
File "/tmp/script.py", line 155, in _update
time.sleep(period)
KeyboardInterrupt
0(37001) ALERT: <core> [main.c:774]: handle_sigs(): child process 37002 exited normally, status=1
0(37001) INFO: <core> [main.c:802]: handle_sigs(): terminating due to SIGCHLD
1(37003) ERROR: <core> [core/udp_server.c:464]: udp_rcv_loop(): recvfrom:[4] Interrupted system call
8(37014) CRITICAL: <core> [core/pass_fd.c:277]: receive_fd(): EOF on 4
1(37003) ERROR: <core> [core/udp_server.c:464]: udp_rcv_loop(): recvfrom:[4] Interrupted system call

So, how I can kill child process by SIGTERM signal?


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