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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 spe‐
     cific to NetBSD.  The header is perhaps best characterized as a kernel
     equivalent of <sys/types.h>.  The following list summarizes the provided
     definitions and macros.

	   ·   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.

	   ·   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).

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

	   ·   Definitions provided for historical and compatibility reasons.
	       Examples range from definitions such as “#define BSD” to old
	       priority 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

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