Hello,

practically you want to call a function from another compiled object (like from a library). The way to do it is to expose the function you want via an API structure and then bind to this module from your module. This is quite common practice in kamailio -- for example, a lot of modules connect to tm module to use its functions.

You can look at sl module how it exports some of its functions (the structure sl_api_t and the function sl_load_api) and then at registrar module to see how it bind and uses the api from sl module.

Cheers,
Daniel

On 08/05/15 16:07, Cockhootec Yahrabee wrote:

Hi guys,

I found this very useful function in `sdpops` module which I want to use within my own module but I cannot find out how to forward its declaration correctly so I can use it in my module.

Since `sdpops` has not defined it's functions within .h file I am just simply forward declaring function I want to use in my .h file like this:

int sdp_remove_codecs_by_name(sip_msg_t* msg, str* codecs);

And then I just calling it within my function. I can compile it and linker won't give me any errors but when I am running Kamailio it says that I have error in config file which is obviously not true because if I comment code which uses forward declared function kamailio runs without errors.

Kamailio log (when using forwarded declaration of sdpops function):

 0(23096) DEBUG: <core> [route_struct.c:129]: mk_action(): ACTION_#2 #0/2: 3(3)/ 0x1

 0(23096) DEBUG: <core> [route_struct.c:129]: mk_action(): ACTION_#2 #1/2: 3(3)/ 0x1

 0(23096) DEBUG: <core> [route_struct.c:129]: mk_action(): ACTION_#16 #0/3: 22(16)/ 0x7f115fcfa898

 0(23096) DEBUG: <core> [route_struct.c:129]: mk_action(): ACTION_#16 #1/3: 8(8)/ 0x7f115fcfaf98

 0(23096) DEBUG: <core> [route_struct.c:129]: mk_action(): ACTION_#16 #2/3: 0(0)/ 0x7f1100000000

 0(23096) DEBUG: <core> [route.c:129]: route_add(): mapping routing block (0xa84a40)[MANAGE_FAILURE] to 1

ERROR: bad config file (1 errors)

 0(23096) DEBUG: <core> [ppcfg.c:224]: pp_ifdef_level_check(): same number of pairing preprocessor directives #!IF[N]DEF - #!ENDIF

 0(23096) DEBUG: tm [t_funcs.c:85]: tm_shutdown(): DEBUG: tm_shutdown : start

 0(23096) DEBUG: tm [t_funcs.c:88]: tm_shutdown(): DEBUG: tm_shutdown : emptying hash table

 0(23096) DEBUG: tm [t_funcs.c:90]: tm_shutdown(): DEBUG: tm_shutdown : removing semaphores

 0(23096) DEBUG: tm [t_funcs.c:92]: tm_shutdown(): DEBUG: tm_shutdown : destroying tmcb lists

 0(23096) DEBUG: tm [t_funcs.c:95]: tm_shutdown(): DEBUG: tm_shutdown : done

 0(23096) DEBUG: <core> [mem/shm_mem.c:242]: shm_mem_destroy(): shm_mem_destroy

 0(23096) DEBUG: <core> [mem/shm_mem.c:245]: shm_mem_destroy(): destroying the shared memory lock

Did anybody resolved this issue? All help is appreciated.

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-- 
Daniel-Constantin Mierla
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Kamailio World Conference, May 27-29, 2015
Berlin, Germany - http://www.kamailioworld.com

-- 
Daniel-Constantin Mierla
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Kamailio World Conference, May 27-29, 2015
Berlin, Germany - http://www.kamailioworld.com