Re:

"benben xiao" <xiaoxiaoben@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@innocent.com, hohmuth@sax.de http://www.sax.de/~hohmuth/