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[C] fopen("", mode)

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Is it possible to call fopen and pass a null string as the filename? All I want is the file descriptor, so I can write a bunch of data, rewind to start, and then return it. Well, I know it's possible, but is it allowed? None of the docs I have access to will say either way.

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Is tmpfile() in the standard C library? If it's a MSFTism, or a GCCism, or any other ism, it's not good.

*wanders off to check for himself*

EDIT: Yay, it is! Thanks.

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