Updated: 2022/Sep/29

Please read Privacy Policy. It's for your privacy.

PARAM(3)                   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 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.

NetBSD 10.99                    April 10, 2011                    NetBSD 10.99