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*?

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

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