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[Michael Hohmuth]

"benben xiao" <xiaoxiaoben at hotmail.com> writes:

>   When I see fiasco kernel, I have a simple question:
>        I don't know
>           #if 0
>             ...
>             ...
>           #endif
>       what do '0' mean  there?

This is a way to comment out unused code: Everything between "#if 0"
and "#endif" is stripped by the preprocessor, and is ignored by the
compiler.

For more information about the C/C++ preprocessor, please refer to the
GNU CPP manual.  On most systems, you can browse it with "info cpp".
The answer to your particular question is in "info cpp conditional deletion".

Michael
-- 
hohmuth at innocent.com, hohmuth at sax.de
http://www.sax.de/~hohmuth/