param(3) [netbsd man page]

PARAM(3)						   BSD Library Functions Manual 						  PARAM(3)

NAME

     param -- common parameters

SYNOPSIS

     #include <sys/param.h>

     size
     MAX(size a, size b);

     size
     MIN(size a, size b);

DESCRIPTION

     The <sys/param.h> header includes some common definitions and macros specific to NetBSD.  The header is perhaps best characterized as a ker-
     nel equivalent of <sys/types.h>.  The following list summarizes the provided definitions and macros.

	   o   First and foremost, the header defines the version of NetBSD.  This is defined as

		     #define __NetBSD_Version__    599004800   /* 5.99.48 */

	       The general format is ``MMmmrrpp00'', where 'MM' and 'mm' denote the major and minor version, respectively, 'rr' is provided for
	       compatibility, and 'pp' defines the patch level.

	   o   Common utility macros such as MAX() and MIN() as well as more specific macros such as STACK(9), ctod(9), mstohz(9), roundup(9), and
	       setbit(9).

	   o   Numerous miscellaneous definitions such as limits, constants for the kernel memoryallocators(9), scale factors used by the sched-
	       uler, kthread(9) priorities, and many others.

	   o   Definitions provided for historical and compatibility reasons.  Examples range from definitions such as ``#define BSD'' to old pri-
	       ority levels used in the kernel.

SEE ALSO

     bitops(3), cdefs(3), types(3), unistd(3)

HISTORY

     A <param.h> header appeared already in the Version 4 AT&T UNIX.

BSD
								  April 10, 2011							       BSD

CDEFS(3)						   BSD 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), __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 1.3 2011/04/08 07:55:04 jruoho 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.

BSD
								   April 8, 2011							       BSD