How to initialize a shared library on Linux

I am developing a shared library using C++ under Linux, and I would like this library to use log4cxx for logging purposes. However, I'm not sure how to set this up. For log4cxx to work, I need to create a logger object. How can I make sure this object is created when my library is loaded? I suspect that it will be easiest to create the logger object as a global variable and then use it from any of the source files of my library, declaring it as extern in the headers. But how can I have the logger created automatically once an application connects to the library? I know that in DLLs for Windows, there's a thing as REASON_FOR_CALL == PROCESS_ATTACH; is there a similar thing under Linux?

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