17 Sep
2011
17 Sep
'11
11:44 a.m.
Hello,
This is Luis Martin. I am developing a new module for Kamailio. This module
will include some functions which will allow Kamailio to connect to another
servers and retrieve information. I'm thinking on creating a couple of child
from my main function, each child will execute a query to an specific
server. I read this file "doc/modules_init.txt", but I'm having some
troubles and I would appreciate if you could please help me with this.
This is the how the the first draft of the forking code looks like:
http://pastebin.com/MLXDN9p9
I call the "mod_child" function from my function like this:
int myFunction () {
(...)
mod_child(randomNUMBER);
(...)
}
But nothing happens, neither during the compilation process, nor the
execution. Nothing is printed on the logs. Can you please point me out any
suggestion or example?
- How I am supposed to call the "mod_child()" function?
- Which should be the rank_number: PROC_MAIN?
- How I am supposed to cal the "mod_init()" function?
- Again, could you please provide my any example?
Thanks a lot.
Best,
Luis Martin
17 Sep
17 Sep
4:26 p.m.
Hey Luis,
Am 17.09.2011 um 17:44 schrieb Luis Martin Gil:
This is Luis Martin. I am developing a new module for
Kamailio. This module will include some functions which will allow Kamailio to connect to
another servers and retrieve information. I'm thinking on creating a couple of child
from my main function, each child will execute a query to an specific server. I read this
file "doc/modules_init.txt", but I'm having some troubles and I would
appreciate if you could please help me with this.
This is the how the the first draft of the forking code looks like:
http://pastebin.com/MLXDN9p9
I call the "mod_child" function from my function like this:
int myFunction () {
(...)
mod_child(randomNUMBER);
(...)
}
But nothing happens, neither during the compilation process, nor the execution. Nothing
is printed on the logs. Can you please point me out any suggestion or example?
- How I am supposed to call the "mod_child()" function?
You do not call it. It's called automatically by Kamailio for every child configured.
That is, if you have 16 workers set in your server configuration, the function is called
16 times. Place initialization code per child (e.g., establishing database connections) in
that function, and Kamailio will make sure the code will be carried out for each child.
- Which should be the rank_number: PROC_MAIN?
Again, you do not set the rank number, you use (read) it. As the documentation states, the
child initialization function is called multiple times at different steps in the
initialization process. By means of comparing the rank number to PROC_MAIN and other
constants, you can make sure that you are doing specific tasks at the right time in the
initialization life cycle.
The concept is the same as the way you do forking in Linux: fork()'s return value of 0
indicates you're in a child process, anything else means you're in the parent
process. You do the comparison in the very same function, just like you do in
Kamailio's mod_child(). I noticed you fork off some children yourself in your example
code; not sure if that is supposed to work within Kamailio, I've never done (or
needed) it myself. If you're good with having as many worker processes as there are
configured in the Kamailio configuration, you should be fine working with that.
- How I am supposed to cal the "mod_init()"
function?
You don't. (I believe you got the idea by now. :) ). Just put your non-child-specific
initialization code there and let it get called by Kamailio.
- Again, could you please provide my any example?
Pick a non-trivial module, many of them require child-based initialization. Examples are
the dialog or p_usrloc module.
HTH,
--Timo
27 Sep
27 Sep
7:12 p.m.
Thanks for your response Timo.
I did not find the solution yet since I had to postpone this development for
the future. I am sorry I forgot to reply you. Hopefully I can return to this
in the future and I will let you know my code's situation.
Luis
2011/9/17 Timo Reimann <timo.reimann(a)1und1.de>
Hey Luis,
Am 17.09.2011 um 17:44 schrieb Luis Martin Gil:
This is Luis Martin. I am developing a new module
for Kamailio. This
module will include some functions which will allow Kamailio to
connect to
another servers and retrieve information. I'm thinking on creating a couple
of child from my main function, each child will execute a query to an
specific server. I read this file "doc/modules_init.txt", but I'm having
some troubles and I would appreciate if you could please help me with this.
This is the how the the first draft of the forking code looks like:
http://pastebin.com/MLXDN9p9
I call the "mod_child" function from my function like this:
int myFunction () {
(...)
mod_child(randomNUMBER);
(...)
}
But nothing happens, neither during the compilation process, nor the
execution.
Nothing is printed on the logs. Can you please point me out any
suggestion or example?
- How I am supposed to call the
"mod_child()" function?
You do not call it. It's called automatically by Kamailio for every child
configured. That is, if you have 16 workers set in your server
configuration, the function is called 16 times. Place initialization code
per child (e.g., establishing database connections) in that function, and
Kamailio will make sure the code will be carried out for each child.
- Which should be the rank_number: PROC_MAIN?
Again, you do not set the rank number, you use (read) it. As the
documentation states, the child initialization function is called multiple
times at different steps in the initialization process. By means of
comparing the rank number to PROC_MAIN and other constants, you can make
sure that you are doing specific tasks at the right time in the
initialization life cycle.
The concept is the same as the way you do forking in Linux: fork()'s return
value of 0 indicates you're in a child process, anything else means you're
in the parent process. You do the comparison in the very same function, just
like you do in Kamailio's mod_child(). I noticed you fork off some children
yourself in your example code; not sure if that is supposed to work within
Kamailio, I've never done (or needed) it myself. If you're good with having
as many worker processes as there are configured in the Kamailio
configuration, you should be fine working with that.
- How I am supposed to cal the
"mod_init()" function?
You don't. (I believe you got the idea by now. :) ). Just put your
non-child-specific initialization code there and let it get called by
Kamailio.
- Again, could you please provide my any example?
Pick a non-trivial module, many of them require child-based initialization.
Examples are the dialog or p_usrloc module.
HTH,
--Timo
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days inactive
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2 comments
2 participants
participants (2)
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Luis Martin Gil -
Timo Reimann