Error handling strategies in a shared library - C

Question

I am writing a cross platform shared library (.so in linux and .dll in windows) using C. Currently when there is a error, library functions returns the

Answer 1

On linux, instead of printing the error on standard output (or standard error), you should log the error using rsyslog. Since you are dealing with GUI, maybe you can also pop a message box (not always).

I have no idea about the windows, but I think it has something similar.