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CDEFS(3) Library Functions Manual CDEFS(3) NAME cdefs -- common definitions and macros SYNOPSIS #include <sys/cdefs.h> DESCRIPTION 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 from C99. o Macros and definitions specific to compilers, preprocessors, and linkers; see __CONCAT(3), __UNCONST(3), __USE(3), __insn_barrier(3), and attribute(3). o Utility macros provided for convenience; see __arraycount(3) and bits(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. */ #include <sys/cdefs.h> __RCSID("$NetBSD: cdefs.3,v 1.4 2013/10/27 10:05:15 apb Exp $"); It is possible to identify the RCS keyword strings by using ident(1). SEE ALSO ident(1), param(3), stddef(3), types(3), c(7) HISTORY The <sys/cdefs.h> header was originally imported from 386BSD. NetBSD 7.1.2 April 8, 2011 NetBSD 7.1.2