CDEFS(3) Library Functions Manual CDEFS(3)
cdefs -- common definitions and macros
The <sys/cdefs.h> header includes some common definitions and macros
typical to the C language conventions of NetBSD. Among these are:
o Certain C language properties and definitions that are
versioned according to the support in compilers. Examples
include the __func__ keyword and the restrict type qualifier
o Macros and definitions specific to compilers, preprocessors,
and linkers; see __CONCAT(3), __UNCONST(3), __insn_barrier(3),
o Utility macros provided for convenience; see __arraycount(3)
The header also contains the __RCSID() and __KERNEL_RCSID() macros used
for version control system (VCS) identifiers. Thus, all NetBSD source
code files typically include <sys/cdefs.h>, included as the first thing
right after any possible copyright texts;
* Copyright (c) 1984 John Doe
* All rights reserved.
* Redistribution and use in source and binary forms,
* with or without modification, are permitted.
__RCSID("$NetBSD: cdefs.3,v 1.3 2011/04/08 07:55:04 jruoho Exp $");
It is possible to identify the RCS keyword strings by using ident(1).
ident(1), param(3), stddef(3), types(3), c(7)
The <sys/cdefs.h> header was originally imported from 386BSD.
NetBSD 6.1.5 April 8, 2011 NetBSD 6.1.5