What's the int macro for stdin?

stdin is of type FILE *,

is开发者_如何学运维 there a fd macro for it?

Or do I need to convert it myself?

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STDIN_FILENO from unistd.h

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fileno(stdin)

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The following are the integer file descriptors for the standard streams:

• 0: stdin
• 1: stdout
• 2: stderr