Trouble developing an extension for linux server

[CmdJohnson 10]

Hello everyone,

I recently gained interest in developing an extension for my arma 3 linux server.

I went to the wiki (-> Extensions#Linux_shared_library_interface (first post, so no links)), compiled the example, put the resulting example.so in my server root directory and called

it via

diag_log ["Output: %1", "example" callExtension "version"];

from within my init.sqf file.

However, I get no output (besides "Output: ", what is definately not the output I want).

So, the three possible Errors that come into my mind are:

1. the C code is broken
   
2. I'm calling the extension the wrong way
   
3. I placed the file at the wrong location
   

I already tried to modify the code to always return "It works!" whenever I call it, and I tested the whole extension

by writing a small program, that loads it and calls the function; in that case, I got the desired output, so I guess the extension itself is okay.

I'm realy stuck on this, so any clues are appreciated.

[albertfish 11]

Where did you put the extension that you are trying to call? Also, have you tried writing to a file or something to see if the extension code is executing?

[CmdJohnson 10]

I put that thing into my arma 3 server root directory, at the same level as the main executable, but I also tried putting it in a subfolder and adding that folder as a mod (the .so in the ./@example folder, with parameter -mod="@example").

Writing to a file, again, works completely fine with my test program, but called from within the sqf script just does nothing at all.

[CmdJohnson 10]

Anyone?

I'd love to contine my work on this topic :/

[Master85 1]

when on a 64-bit linux make sure to compile it as 32-bit

gets the shared library loaded by the server? (check with lsof, strace, ...)

[CmdJohnson 10]

Well.. thanks

Turned out I really compiled it as a 64bit library, I should've thought of that

Compiling it with the -m32 flag did the magic for me, now everything works just fine!

[Ra'Jiska 19]

Hey, sorry for necroing this thread but cannot create any new one.

Is there any way to compile C++ code into Shared Object for Arma ?

I've been compiling it with gcc & g++ many times, but only the C code is working (otherwise extension isn't loaded).

Here are the commands I used:

gcc -shared -fPIC -m32 -o example.so example.c

gcc -shared -fPIC -m32 -o example.so example.cpp

g++ -shared -fPIC -m32 -o example.so example.c

gcc -shared -fPIC -m32 -o example.so example.cpp

Thanks.