Sharing a FILE pointer between libraries

I got a simple quesiton; I am using a FILE* fp in one of my libraries to fopen/fwrite开发者_JS百科 to the file, and I want to do fclose() on fp in another library - what is the best way for the other library to get the file handle?

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If your two libraries talk to each other then the first should pass the FILE* to the second in a function call.

If the libraries don't talk to each other then the main application should get the FILE* from the first library and hand it to the second library. Or better, the application should own the FILE*, hand it to the first library already opened, and then hand it to the second library to be finished off, and finally the application should close the FILE* itself. Trying to deal with a library that wants a filename instead of a FILE* can be very frustrating when you have something that is like a file but doesn't have a name.