On Tue, Jan 07, 2003 at 02:05:47PM +0530, SACHIN PRASAD wrote: > hi all , > In the kernel code , i see lot of __words__ what are they ? > do they hold some special meaning or some programming convention > also some are having one underscore some have two ... > regards > sachin Usualy, they are ANSI protected keywords. That is, C extensions that should not generate warnings on ANSI-only compiler. You can find them in user-land programs too. Just the kernel uses them a LOT. GCC understands both __foo__ and foo variants of all it's extension keywords and both variants can usualy be seen in kernel. On the other hand __identifiers are a convention to distinguish functions, that can only be used in special circumstances (many "foo" funtions call __foo after doing some checking, locking locks etc.). ------------------------------------------------------------------------------- Jan 'Bulb' Hudec <bulb@ucw.cz> -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
