param(3) - NetBSD Manual Pages

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PARAM(3)                NetBSD 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 pro-
               vided 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 6.1.2                    April 10, 2011                    NetBSD 6.1.2