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