PARAM(3) Library Functions Manual PARAM(3)
param -- common parameters
MAX(size a, size b);
MIN(size a, size b);
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.
o 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.
o 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).
o Numerous miscellaneous definitions such as limits, constants
for the kernel memoryallocators(9), scale factors used by the
scheduler, kthread(9) priorities, and many others.
o Definitions provided for historical and compatibility reasons.
Examples range from definitions such as ``#define BSD'' to old
priority levels used in the kernel.
bitops(3), cdefs(3), types(3), unistd(3)
A <param.h> header appeared already in the Version 4 AT&T UNIX.
NetBSD 6.1.5 April 10, 2011 NetBSD 6.1.5