Copyright (c) 2011 Jukka Ruohonen <jruohonen@iki.fi>
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.Dd April 10, 2011 .Dt PARAM 3 .Os .Sh NAME .Nm param .Nd common parameters .Sh SYNOPSIS n sys/param.h .Ft size .Fn MAX "size a" "size b" .Ft size .Fn MIN "size a" "size b" .Sh DESCRIPTION The n sys/param.h header includes some common definitions and macros specific to .Nx . The header is perhaps best characterized as a kernel equivalent of n sys/types.h . The following list summarizes the provided definitions and macros. l -bullet -offset indent t First and foremost, the header defines the version of .Nx . This is defined as d -literal -offset indent #define __NetBSD_Version__ 599004800 /* 5.99.48 */ .Ed
p The general format is .Dq MMmmrrpp00 , where .Sq MM and .Sq mm denote the major and minor version, respectively, .Sq rr is provided for compatibility, and .Sq pp defines the patch level. t Common utility macros such as .Fn MAX and .Fn MIN as well as more specific macros such as .Xr STACK 9 , .Xr ctod 9 , .Xr mstohz 9 , .Xr roundup 9 , and .Xr setbit 9 . t Numerous miscellaneous definitions such as limits, constants for the kernel .Xr memoryallocators 9 , scale factors used by the scheduler, .Xr kthread 9 priorities, and many others. t Definitions provided for historical and compatibility reasons. Examples range from definitions such as .Dq #define BSD to old priority levels used in the kernel. .El .Sh SEE ALSO .Xr bitops 3 , .Xr cdefs 3 , .Xr types 3 , .Xr unistd 3 .Sh HISTORY A n param.h header appeared already in the .At v4 .