param(3) - NetBSD Manual Pages

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 8.3 April 10, 2011 NetBSD 8.3

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