PARAM(3) BSD Library Functions Manual PARAM(3)NAMEparam — 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 ALSObitops(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