You can just give it NULL for both params. It looks like it's for some commandline options which you probably dont' need.
Although I don't think this function you wrote is very good. It might not even work because you are shutting down OpenAL immediately after playing a sound (and I think the alSourcePlay call is nonblocking, so it will shut down before you even hear anything)
Setting up and shutting down OpenAL for every single sound is also not a good idea. It's resource intensive and wasteful. Typcially you setup/shutdown exactly once (set up at program startup, shutdown at program exit).