On Mac OS X, how do I turn a POSIX fd into a FILE*?

I'm working with a lexer that accepts FILE* objects to read data from. I'd like to be able to pass it POSIX 开发者_开发知识库file descriptors (i.e. stuff you get from open, pipes, etc.).

How can I turn a POSIX file descriptor into a FILE*?

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On any POSIX-compliant system, you use fdopen().

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Use fdopen(3) in <stdio.h>.