Pre-defined pre-processor symbols

[mbr at aoa.UUCP]

Can anybody answer the following questions.  Please send mail instead of
posting the answers.  I will summarize.

 1. I know that the C pre-processor pre-defines a few symbols, including
    __LINE__ and __FILE__, but I have been unable to find this documented
    in K&R anywhere.  Is this a quirk of PCC or is it true of all C
    compilers?

 2. I know that there's also one which tells what machine you're generating
    code for, but I can't remember its name.

 3. Is there a symbol which tells what function you're in?  (Hmmmm... seems
    highly unlikely since the pre-processor wouldn't even know it was looking
    at a function, but maybe somebody hacked it in some other way.)

 4. Are there any other pre-defined symbols?  

Thanks in advance.
-- 

	Mark of the Valley of Roses
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