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Command: cdefs | Section: 3 | Source: NetBSD | File: cdefs.3
CDEFS(3) FreeBSD 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 __BIT(3), __BITS(3), __CONCAT(3),
__FPTRCAST(3), __SHIFTIN(3), __SHIFTOUT(3), __SHIFTOUT_MASK(3),
__UNCONST(3), __UNVOLATILE(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 1.5 2019/11/10 18:45:09 christos 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.
FreeBSD 14.1-RELEASE-p8 November 10, 2019 FreeBSD 14.1-RELEASE-p8