#include <param.h>

`MAXCOMLEN`

Interface status:

externallyDefinedApi

MAXCOMLEN 19

Description

max command name remembered

`MAXINTERP`

Interface status:

externallyDefinedApi

MAXINTERP 32

Description

max interpreter file name length

`MAXLOGNAME`

Interface status:

externallyDefinedApi

MAXLOGNAME 17

Description

max login name length (incl. NUL)

`MAXUPRC`

Interface status:

externallyDefinedApi

MAXUPRC CHILD_MAX

Description

max simultaneous processes

`NCARGS`

Interface status:

externallyDefinedApi

NCARGS ARG_MAX

Description

max bytes for an exec function

`NGROUPS`

Interface status:

externallyDefinedApi

NGROUPS NGROUPS_MAX

Description

max number groups

`NOFILE`

Interface status:

externallyDefinedApi

NOFILE OPEN_MAX

Description

max open files per process

`NOGROUP`

Interface status:

externallyDefinedApi

NOGROUP 65535

Description

marker for empty group set member

`MAXHOSTNAMELEN`

Interface status:

externallyDefinedApi

MAXHOSTNAMELEN 256

Description

max hostname size

`SPECNAMELEN`

Interface status:

externallyDefinedApi

SPECNAMELEN 63

Description

max length of devicename

`DEV_BSHIFT`

Interface status:

externallyDefinedApi

DEV_BSHIFT 9

Description

log2(DEV_BSIZE)

`DEV_BSIZE`

Interface status:

externallyDefinedApi

DEV_BSIZE (1<<DEV_BSHIFT)

Description

(1<<DEV_BSHIFT)

`BLKDEV_IOSIZE`

Interface status:

externallyDefinedApi

BLKDEV_IOSIZE PAGE_SIZE

Description

default block device I/O size

`DFLTPHYS`

Interface status:

externallyDefinedApi

DFLTPHYS (64 * 1024)

Description

default max raw IO transfer size

`MAXPHYS`

Interface status:

externallyDefinedApi

MAXPHYS (128 * 1024)

Description

max raw IO transfer size

`MAXDUMPPGS`

Interface status:

externallyDefinedApi

MAXDUMPPGS (DFLTPHYS/PAGE_SIZE)

Description

(DFLTPHYS by PAGE_SIZE)

`MSIZE`

Interface status:

externallyDefinedApi

MSIZE 256

Description

size of an mbuf

`ctob`

Interface status:

externallyDefinedApi

ctob (x) ((x)<<PAGE_SHIFT)

Description

clicks to bytes

Parameters

x

`btoc`

Interface status:

externallyDefinedApi

btoc (x) (((vm_offset_t)(x)+PAGE_MASK)>>PAGE_SHIFT)

Description

bytes to clicks

Parameters

x

`btodb`

Interface status:

externallyDefinedApi

btodb (bytes) (sizeof (bytes) > sizeof(long) \ ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \ : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT))

Description

calculates (bytes by DEV_BSIZE)

Parameters

bytes

`dbtob`

Interface status:

externallyDefinedApi

dbtob (db) ((off_t)(db) << DEV_BSHIFT)

Description

calculates (db)(DEV_BSIZE)

Parameters

db

`PRIMASK`

Interface status:

externallyDefinedApi

PRIMASK 0x0ff

Description

Primary mask

`PCATCH`

Interface status:

externallyDefinedApi

PCATCH 0x100

Description

ORd with pri for tsleep to check signals

`PDROP`

Interface status:

externallyDefinedApi

PDROP 0x200

Description

ORd with pri to stop re-entry of interlock mutex

`NZERO`

Interface status:

externallyDefinedApi

NZERO 0

Description

default "nice"

`NBBY`

Interface status:

externallyDefinedApi

NBBY 8

Description

number of bits in a byte

`NBPW`

Interface status:

externallyDefinedApi

NBPW sizeof(int)

Description

number of bytes per word (integer)

`CMASK`

Interface status:

externallyDefinedApi

CMASK 022

Description

default file mask: S_IWGRP OR S_IWOTH

`NODEV`

Interface status:

externallyDefinedApi

NODEV (dev_t)(-1)

Description

non-existent device

`CBLOCK`

Interface status:

externallyDefinedApi

CBLOCK 128

Description

Clist block size, must be a power of 2.

`CBQSIZE`

Interface status:

externallyDefinedApi

CBQSIZE (CBLOCK/NBBY)

Description

Quote bytes or cblock

`CBSIZE`

Interface status:

externallyDefinedApi

CBSIZE (CBLOCK - sizeof(struct cblock *) - CBQSIZE)

Description

Data chars or clist

`CROUND`

Interface status:

externallyDefinedApi

CROUND (CBLOCK - 1)

Description

Clist rounding.

`MAXBSIZE`

Interface status:

externallyDefinedApi

MAXBSIZE 65536

Description

Filesystems are made out of blocks of at most MAXBSIZE bytes per block. MAXBSIZE may be made larger without effecting any existing filesystems as long as it does not exceed MAXPHYS, and may be made smaller at the risk of not being able to use filesystems which require a block size exceeding MAXBSIZE.

`BKVASIZE`

Interface status:

externallyDefinedApi

BKVASIZE 16384

Description

Nominal buffer space per buffer, in bytes. BKVASIZE is the minimum KVM memory reservation the kernel is willing to make. Filesystems can of course request smaller chunks. Actual backing memory uses a chunk size of a page (PAGE_SIZE).

`BKVAMASK`

Interface status:

externallyDefinedApi

BKVAMASK (BKVASIZE-1)

Description

File system parameter and macros

`MAXSYMLINKS`

Interface status:

externallyDefinedApi

MAXSYMLINKS 32

Description

Maximum number of symbolic links that may be expanded in a path name. It should be set high enough to allow all legitimate uses, but halt infinite loops reasonably quickly.

`howmany`

Interface status:

externallyDefinedApi

howmany (x, y) (((x)+((y)-1))/(y))

Description

Macros for counting and rounding.

Parameters

`x`
`y`

`rounddown`

rounddown (x, y) (((x)/(y))*(y))

Description

Macros for counting and rounding.

Parameters

`x`
`y`

`roundup`

roundup (x, y) ((((x)+((y)-1))/(y))*(y))

Description

Macros for counting and rounding.

Parameters

`x`
`y`

`roundup2`

roundup2 (x, y) (((x)+((y)-1))&(~((y)-1)))

Description

Macros for counting and rounding.

Parameters

`x`
`y`

`powerof2`

Interface status:

externallyDefinedApi

powerof2 (x) ((((x)-1)&(x))==0)

Description

Macros for counting and rounding.

Parameters

x

`MAX`

Interface status:

externallyDefinedApi

MAX (a, b) (((a)>(b))?(a):(b))

Description

Macros for min or max.

Parameters

`a`
`b`

`MINBUCKET`

Interface status:

externallyDefinedApi

MINBUCKET 4

Description

min allocation of 32 bytes or 16 bytes

`MAXALLOCSAVE`

Interface status:

externallyDefinedApi

MAXALLOCSAVE (2 * PAGE_SIZE)

Description

(2)(PAGE_SIZE)

`FSHIFT`

Interface status:

externallyDefinedApi

FSHIFT 11

Description

bits to right of fixed binary point

`FSCALE`

Interface status:

externallyDefinedApi

FSCALE (1<<FSHIFT)

Description

bits to right 1 shift