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Diff for /src/share/man/man7/sysctl.7 between version 1.48 and 1.59

version 1.48, 2010/07/28 20:49:12

version 1.59, 2011/02/01 20:43:48

Line 29

.\"

.\" @(#)sysctl.3 8.4 (Berkeley) 5/9/95

.\"

.Dd July 28, 2010

.Dd February 1, 2011

.Dt SYSCTL 7

.Os

.Sh NAME

Line 68 sysctl variable relative to the upper le

See the

.Xr sysctl 3

manual page for programming examples.

.Sh Top level names

.Ss Top level names

The top level names are defined with a CTL_ prefix in

The top level names are defined with a

.Va CTL_

prefix in

.In sys/sysctl.h ,

and are as follows.

The next and subsequent levels down are found in the include files

listed here, and described in separate sections below.

.Bl -column security CTL_SECURITY "Next level names" "High kernel limits"

.Bl -column "security" ".Dv CTL_SECURITY" ".In uvm/uvm_param.h" "High kernel limits"

.It Sy Name Constant Next level names Description

.It Sy Name Ta Sy Constant Ta Sy Next level names Ta Sy Description

.It kern CTL_KERN sys/sysctl.h High kernel limits

.It kern Ta Dv CTL_KERN Ta In sys/sysctl.h Ta High kernel limits

.It vm CTL_VM uvm/uvm_param.h Virtual memory

.It vm Ta Dv CTL_VM Ta In uvm/uvm_param.h Ta Virtual memory

.It vfs CTL_VFS sys/mount.h Filesystem

.It vfs Ta Dv CTL_VFS Ta In sys/mount.h Ta Filesystem

.It net CTL_NET sys/socket.h Networking

.It net Ta Dv CTL_NET Ta In sys/socket.h Ta Networking

.It debug CTL_DEBUG sys/sysctl.h Debugging

.It debug Ta Dv CTL_DEBUG Ta In sys/sysctl.h Ta Debugging

.It hw CTL_HW sys/sysctl.h Generic CPU, I/O

.It hw Ta Dv CTL_HW Ta In sys/sysctl.h Ta Generic CPU, I/O

.It machdep CTL_MACHDEP sys/sysctl.h Machine dependent

.It machdep Ta Dv CTL_MACHDEP Ta In sys/sysctl.h Ta Machine dependent

.It user CTL_USER sys/sysctl.h User-level

.It user Ta Dv CTL_USER Ta In sys/sysctl.h Ta User-level

.It ddb CTL_DDB sys/sysctl.h In-kernel debugger

.It ddb Ta Dv CTL_DDB Ta In sys/sysctl.h Ta In-kernel debugger

.It proc CTL_PROC sys/sysctl.h Per-process

.It proc Ta Dv CTL_PROC Ta In sys/sysctl.h Ta Per-process

.It vendor CTL_VENDOR ? Vendor specific

.It vendor Ta Dv CTL_VENDOR Ta ? Ta Vendor specific

.It emul CTL_EMUL sys/sysctl.h Emulation settings

.It emul Ta Dv CTL_EMUL Ta In sys/sysctl.h Ta Emulation settings

.It security CTL_SECURITY sys/sysctl.h Security settings

.It security Ta Dv CTL_SECURITY Ta In sys/sysctl.h Ta Security settings

.El

.Sh The debug.* subtree

.Ss The debug.* subtree

The debugging variables vary from system to system.

A debugging variable may be added or deleted without need to recompile

.Nm

Line 100 Each time it runs,

Line 102 Each time it runs,

gets the list of debugging variables from the kernel and

displays their current values.

The system defines twenty

.Va ( struct ctldebug )

.Vt ( struct ctldebug )

variables named

.Dv debug0

through

Line 110 individually initialized at the location

Line 112 individually initialized at the location

The loader prevents multiple use of the same variable by issuing errors

if a variable is initialized in more than one place.

For example, to export the variable

.Dv dospecialcheck

.Va dospecialcheck

as a debugging variable, the following declaration would be used:

.Pp

.Bd -literal -offset indent -compact

Line 128 See

Line 130 See

.\" and

.\" .Xr sysctl 9

for more information.

.Sh The vfs.* subtree

.Ss The vfs.* subtree

A distinguished second level name,

.Li vfs.generic ( VFS_GENERIC ) ,

is used to get general information about all filesystems.

is used to get general information about all file systems.

It has the following third level identifiers:

.Bl -tag -width compact

.Bl -tag -width "123456"

.It vfs.generic.maxtypenum ( VFS_MAXTYPENUM )

.It Li vfs.generic.maxtypenum ( VFS_MAXTYPENUM )

The highest valid filesystem type number.

The highest valid file system type number.

.It vfs.generic.conf ( VFS_CONF )

.It Li vfs.generic.conf ( VFS_CONF )

Returns configuration information about the file-system type given as a fourth

Returns configuration information about the file system type given as a fourth

level identifier.

.It Li vfs.generic.usermount ( VFS_USERMOUNT )

Determines if non superuser mounts are allowed, default to no

.Dv 0 .

.It Li vfs.generic.magiclinks ( VFS_MAGICLINKS )

Controls if expansion of variables is going to be performed on pathnames

or not.

Defaults to no variable expansion,

.Dv 0 .

Variables are of the form

.Li @name

and the following names are supported:

.Bl -tag -width "kernel_ident"

.It domainname

The domain name as determined by

.Xr getdomainname 2

.It emul

The current process emulation name.

Defaults to

.Dv netbsd .

Other valid emulations are:

.Dv aout ,

.Dv aoutm68k ,

.Dv darwin ,

.Dv freebsd ,

.Dv ibcs2 ,

.Dv irix ,

.Dv linux ,

.Dv linux32 ,

.Dv m68k4k ,

.Dv mach ,

.Dv netbsd32 ,

.Dv osf1 ,

.Dv pecoff ,

.Dv sunos ,

.Dv sunos32 ,

.Dv svr4 ,

.Dv svr4_32 ,

.Dv ultrix ,

.Dv vax1k .

.It gid

The effective group id of the current process.

.It hostname

The host name as determined by

.Xr gethostname 2

.It kernel_ident

The kernel identifier, as specified by config.

For example

.Dv GENERIC .

.It machine

The type of machine as determined by the

.Xr sysctl 3

.Dq hw.machine .

.It machine_arch

The architecture of the processor as determined by the

.Xr sysctl 3

.Dq hw.machine_arch .

.It osrelease

The kernel release number as determined by the

.Xr sysctl 3

.Dq kern.osrelease .

.Xr sysctl 3

.It ostype

The kernel operating system type as determined by the

.Xr sysctl 3

.Dq kern.ostype .

Defaults to

.Dv NetBSD .

.It rgid

The real group id of the current process.

.It ruid

The real user id of the current process.

.It uid

The effective user id of the current process.

.El

.Pp

The remaining second level identifiers are the file-system names, identified

A second level name for controlling the

.Xr wapbl 4

(Write Ahead Physical Block Logging file system journalling)

capabilities with the following third level identifiers:

.Bl -tag -width "123456"

.It Li vfs.wapbl.flush_disk_cache

Controls whether to attempt to flush the disk cache on each commit.

It defaults to 1 and it should always be on to ensure data integrity in

case of a crash.

For slow disks, turning it off can improve performance.

.It Li vfs.wapbl.verbose_commit

For each transaction log commit, print the number of bytes written

and the time it took to commit as seconds.nanoseconds.

.El

.Pp

The remaining second level identifiers are the file system names, identified

by the type number returned by a

.Xr statvfs 2

call or from

.Li vfs.generic.conf .

The third level identifiers available for each filesystem

.Pp

The third level identifiers available for each file system

are given in the header file that defines the mount

argument structure for that filesystem.

argument structure for that file system.

.Sh The hw.* subtree

.Ss The hw.* subtree

The string and integer information available for the

.Li hw

level is detailed below.

Line 179 Alignment constraint for all possible da

Line 271 Alignment constraint for all possible da

This shows the value

.Dv ALIGNBYTES

.Pa /usr/include/machine/param.h ,

.In machine/param.h ,

at the kernel compilation time.

.It Li hw.byteorder ( HW_BYTEORDER )

The byteorder (4,321, or 1,234).

The byteorder (4321, or 1234).

.It Li hw.cnmagic ( HW_CNMAGIC )

The console magic key sequence.

.It Li hw.disknames ( HW_DISKNAMES )

Line 194 collected on them.

Line 286 collected on them.

Return statistical information on the NFS mounts, disk and tape

devices on the system.

An array of

.Va struct io_sysctl

.Vt struct io_sysctl

structures is returned,

whose size depends on the current number of such objects in the system.

The third level name is the size of the

.Va struct io_sysctl .

.Vt struct io_sysctl .

The type of object can be determined by examining the

.Va type

element of

.Va struct io_sysctl .

.Vt struct io_sysctl .

Which can be

.Dv IOSTAT_DISK

(disk drive),

Line 229 The bytes of non-kernel memory as a 32-b

Line 321 The bytes of non-kernel memory as a 32-b

.It Li hw.usermem64 ( HW_USERMEM64 )

The bytes of non-kernel memory as a 64-bit integer.

.El

.Sh The kern.* subtree

.Ss The kern.* subtree

This subtree includes data generally related to the kernel.

The string and integer information available for the

.Li kern

Line 239 privilege may change the value.

Line 331 privilege may change the value.

.Bl -column "kern.posix_reader_writer_locks" \

"struct kinfo_drivers" "not applicable"

.It Sy Second level name Type Changeable

.It kern.aio_listio_max integer yes

.It kern.aio_max integer yes

.It kern.arandom integer no

.It kern.argmax integer no

.It kern.boothowto integer no

Line 283 privilege may change the value.

Line 377 privilege may change the value.

.It kern.memory_protection integer no

.It kern.module node not applicable

.It kern.monotonic_clock integer no

.It kern.mqueue node not applicable

.It kern.msgbuf integer no

.It kern.msgbufsize integer no

.It kern.ngroups integer no

Line 295 privilege may change the value.

Line 390 privilege may change the value.

.It kern.pipe node not applicable

.\" .It kern.posix node not applicable

.It kern.posix1version integer no

.It kern.posix_aio integer no

.It kern.posix_barriers integer no

.It kern.posix_reader_writer_locks integer no

.\".It kern.posix_sched integer yes

Line 328 privilege may change the value.

Line 424 privilege may change the value.

.It kern.vnode struct vnode no

.El

.Bl -tag -width "123456"

.It Li kern.aio_listio_max

The maximum number of asynchronous

.Tn I/O

operations in a single list I/O call.

Like with all variables related to

.Xr aio 3 ,

the variable may be created and removed dynamically

upon loading or unloading the corresponding kernel module.

.It Li kern.aio_max

The maximum number of asynchronous I/O operations.

.It Li kern.arandom

This variable picks a random number each time it is queried.

The used random number generator

.Pq Tn RNG

.Pf ( Tn RNG )

is based on

.Xr arc4random 3 .

.It Li kern.argmax ( KERN_ARGMAX )

Line 343 Flags passed from the boot loader; see

Line 449 Flags passed from the boot loader; see

for the meanings of the flags.

.It Li kern.boottime ( KERN_BOOTTIME )

.Va struct timeval

.Vt struct timeval

structure is returned.

This structure contains the time that the system was booted.

.\" .It Li kern.bufq

Line 352 This structure contains the time that th

Line 458 This structure contains the time that th

The scheduler exponential decay value.

.It Li kern.clockrate ( KERN_CLOCKRATE )

.Va struct clockinfo

.Vt struct clockinfo

structure is returned.

This structure contains the clock, statistics clock and profiling clock

frequencies, the number of micro-seconds per hz tick, and the clock

Line 399 Same syntax as kern.defcorename.

Line 505 Same syntax as kern.defcorename.

.It Li kern.cp_id ( KERN_CP_ID )

Mapping of CPU number to CPU id.

.It Li kern.cp_time ( KERN_CP_TIME )

Returns an array of CPUSTATES uint64_ts.

Returns an array of

.Dv CPUSTATES

.Vt uint64_t Ns s.

This array contains the

number of clock ticks spent in different CPU states.

On multi-processor systems, the sum across all CPUs is returned unless

Line 430 and

Line 538 and

.Xr core 5

for format of this template).

The default value is

.Nm %n.core

.Pa %n.core

and can be changed with the kernel configuration option

.Cd options DEFCORENAME

(see

Line 442 Detach all devices at shutdown.

Line 550 Detach all devices at shutdown.

Get or set the YP domain name.

.It Li kern.drivers ( KERN_DRIVERS )

Return an array of

.Va struct kinfo_drivers

.Vt struct kinfo_drivers

that contains the name and major device numbers of all the device drivers

in the current kernel.

The

Line 457 Perform a crash dump on system

Line 565 Perform a crash dump on system

.It Li kern.file ( KERN_FILE )

Return the entire file table.

The returned data consists of a single

.Va struct filelist

.Vt struct filelist

followed by an array of

.Va struct file ,

.Vt struct file ,

whose size depends on the current number of such objects in the system.

.It Li kern.forkfsleep ( KERN_FORKFSLEEP )

Line 475 Maximum is 20 seconds.

Line 583 Maximum is 20 seconds.

.It Li kern.fscale ( KERN_FSCALE )

The kernel fixed-point scale factor.

.It Li kern.fsync ( KERN_FSYNC )

Return 1 if the POSIX 1003.1b File Synchronization Option is available

Return 1 if the

.St -p1003.1b-93

File Synchronization Option is available

on this system,

otherwise 0.

otherwise\ 0.

.It Li kern.hardclock_ticks ( KERN_HARDCLOCK_TICKS )

Returns the number of

.Xr hardclock 9

Line 494 Get or set the

Line 604 Get or set the

.Xr hostname 1 .

.It Li kern.iov_max ( KERN_IOV_MAX )

Return the maximum number of

.Va iovec

.Vt iovec

structures that a process has available for use with

.Xr preadv 2 ,

.Xr pwritev 2 ,

Line 527 The third level names for the ipc variab

Line 637 The third level names for the ipc variab

.It Li kern.ipc.sysvmsg ( KERN_SYSVIPC_MSG )

Returns 1 if System V style message queue functionality is available

on this system,

otherwise 0.

otherwise\ 0.

.It Li kern.ipc.sysvsem ( KERN_SYSVIPC_SEM )

Returns 1 if System V style semaphore functionality is available

on this system,

otherwise 0.

otherwise\ 0.

.It Li kern.ipc.sysvshm ( KERN_SYSVIPC_SHM )

Returns 1 if System V style share memory functionality is available

on this system,

otherwise 0.

otherwise\ 0.

.It Li kern.ipc.sysvipc_info ( KERN_SYSVIPC_INFO )

Return System V style IPC configuration and run-time information.

The fourth level name selects the System V style IPC facility.

Line 590 Max number of number of semaphores in sy

Line 700 Max number of number of semaphores in sy

Max number of undo structures in system.

.El

.It Li kern.job_control ( KERN_JOB_CONTROL )

Return 1 if job control is available on this system, otherwise 0.

Return 1 if job control is available on this system, otherwise\ 0.

.It Li kern.labeloffset ( KERN_LABELOFFSET )

The offset within the sector specified by KERN_LABELSECTOR of the

The offset within the sector specified by

.Dv KERN_LABELSECTOR

of the

.Xr disklabel 5 .

.It Li kern.labelsector ( KERN_LABELSECTOR )

The sector number containing the

Line 607 all process exits due to signals which c

Line 719 all process exits due to signals which c

.Xr core 5

file, and whether the coredump was created.

.It Li kern.mapped_files ( KERN_MAPPED_FILES )

Returns 1 if the POSIX 1003.1b Memory Mapped Files Option is available

Returns 1 if the

on this system,

.St -p1003.1b-93

otherwise 0.

Memory Mapped Files Option is available on this system,

otherwise\ 0.

.It Li kern.maxfiles ( KERN_MAXFILES )

The maximum number of open files that may be open in the system.

.It Li kern.maxpartitions ( KERN_MAXPARTITIONS )

Line 661 The variable can only be increased, and

Line 774 The variable can only be increased, and

direct-mapped pool pages.

.El

.It Li kern.memlock ( KERN_MEMLOCK )

Returns 1 if the POSIX 1003.1b Process Memory Locking Option is available

Returns 1 if the

on this system,

.St -p1003.1b-93

otherwise 0.

Process Memory Locking Option is available on this system,

otherwise\ 0.

.It Li kern.memlock_range ( KERN_MEMLOCK_RANGE )

Returns 1 if the POSIX 1003.1b Range Memory Locking Option is available

Returns 1 if the

on this system,

.St -p1003.1b-93

otherwise 0.

Range Memory Locking Option is available on this system,

otherwise\ 0.

.It Li kern.memory_protection ( KERN_MEMORY_PROTECTION )

Returns 1 if the POSIX 1003.1b Memory Protection Option is available

Returns 1 if the

on this system,

.St -p1003.1b-93

otherwise 0.

Memory Protection Option is available on this system,

otherwise\ 0.

.It Li kern.module

Settings related to kernel modules.

The third level names for the settings are described below.

Line 685 The variables are as follows:

Line 801 The variables are as follows:

.Bl -tag -width "123456"

.It Li kern.module.autoload

A boolean that controls whether kernel modules are loaded automatically.

See for example

See

.Xr modstat 8

.Xr module 7

for additional details.

.It Li kern.module.verbose

A boolean that enables or disables verbose

debug messages related to kernel modules.

.El

.It Li kern.monotonic_clock ( KERN_MONOTONIC_CLOCK )

Returns the standard version the implementation of the

.St -p1003.1b-93

Monotonic Clock Option conforms to,

otherwise\ 0.

.It Li kern.mqueue

Settings related to

.Tn POSIX

Line 722 The default maximum message count.

Line 843 The default maximum message count.

.It Li kern.mqueue.mq_max_maxmsg

The maximum number of messages in a message queue.

.El

.It Li kern.monotonic_clock ( KERN_MONOTONIC_CLOCK )

Returns the standard version the implementation of the POSIX 1003.1b

Monotonic Clock Option conforms to,

otherwise 0.

.It Li kern.msgbuf ( KERN_MSGBUF )

The kernel message buffer, rotated so that the head of the circular kernel

message buffer is at the start of the returned data.

Line 738 The maximum number of supplemental group

Line 855 The maximum number of supplemental group

.\" XXX: Undocumented.

.It Li kern.ntptime ( KERN_NTPTIME )

.Va struct ntptimeval

.Vt struct ntptimeval

structure is returned.

This structure contains data used by the

.Xr ntpd 8

Line 770 The variables are as follows:

Line 887 The variables are as follows:

.It Li kern.pipe.kvasiz ( KERN_PIPE_KVASIZ )

Amount of kernel memory consumed by pipe buffers.

.It Li kern.pipe.maxbigpipes ( KERN_PIPE_MAXBIGPIPES )

Maximum number of "big" pipes.

Maximum number of

.Dq big

pipes.

.It Li kern.pipe.maxkvasz ( KERN_PIPE_MAXKVASZ )

Maximum amount of kernel memory to be used for pipes.

.It Li kern.pipe.limitkva ( KERN_PIPE_LIMITKVA )

Limit for direct transfers via page loan.

.It Li kern.pipe.nbigpipes ( KERN_PIPE_NBIGPIPES )

Number of "big" pipes.

Number of

.Dq big

pipes.

.El

.\" XXX: Undocumented .It Li kern.posix ( ? )

.\" This is a node in which the only variable is semmax.

.It Li kern.posix1version ( KERN_POSIX1 )

The version of ISO/IEC 9945 (POSIX 1003.1) with which the system

The version of ISO/IEC 9945

attempts to comply.

.Pq St -p1003.1

with which the system attempts to comply.

.It Li kern.posix_aio

The version of

.St -p1003.1

and its Asynchronous I/O option to which the system attempts to conform.

.It Li kern.posix_barriers ( KERN_POSIX_BARRIERS )

The version of

.St -p1003.1

and its

Barriers

option to which the system attempts to conform,

otherwise 0.

otherwise\ 0.

.It Li kern.posix_reader_writer_locks ( KERN_POSIX_READER_WRITER_LOCKS )

The version of

.St -p1003.1

and its

Read-Write Locks

option to which the system attempts to conform,

otherwise 0.

otherwise\ 0.

.\".It Li kern.posix_sched

.\" XXX: Undocumented.

.It Li kern.posix_semaphores ( KERN_POSIX_SEMAPHORES )

Line 805 The version of

Line 931 The version of

and its

Semaphores

option to which the system attempts to conform,

otherwise 0.

otherwise\ 0.

.It Li kern.posix_spin_locks ( KERN_POSIX_SPIN_LOCKS )

The version of

.St -p1003.1

and its

Spin Locks

option to which the system attempts to conform,

otherwise 0.

otherwise\ 0.

.It Li kern.posix_threads ( KERN_POSIX_THREADS )

The version of

.St -p1003.1

and its

Threads

option to which the system attempts to conform,

otherwise 0.

otherwise\ 0.

.It Li kern.posix_timers ( KERN_POSIX_TIMERS )

The version of

.St -p1003.1

and its

Timers

option to which the system attempts to conform,

otherwise 0.

otherwise\ 0.

.It Li kern.proc ( KERN_PROC )

Return the entire process table, or a subset of it.

An array of

.Va struct kinfo_proc

.Vt struct kinfo_proc

structures is returned,

whose size depends on the current number of such objects in the system.

The third and fourth level numeric names are as follows:

Line 847 The third and fourth level numeric names

Line 973 The third and fourth level numeric names

.It KERN_PROC_UID A user ID

.El

.It Li kern.proc2 ( KERN_PROC2 )

As for KERN_PROC, but an array of

As for

.Va struct kinfo_proc2

.Dv KERN_PROC ,

but an array of

.Vt struct kinfo_proc2

structures are returned.

The fifth level name is the size of the

.Va struct kinfo_proc2

.Vt struct kinfo_proc2

and the sixth level name is the number of structures to return.

.It Li kern.proc_args ( KERN_PROC_ARGS )

Return the argv or environment strings (or the number thereof)

Line 868 The fourth level name is as follows:

Line 996 The fourth level name is as follows:

.It Li kern.profiling ( KERN_PROF )

Return profiling information about the kernel.

If the kernel is not compiled for profiling,

attempts to retrieve any of the KERN_PROF values will

attempts to retrieve any of the

fail with

.Dv KERN_PROF

values will fail with

.Er EOPNOTSUPP .

The third level names for the string and integer profiling information

is detailed below.

Line 894 Array indexed by program counter of call

Line 1023 Array indexed by program counter of call

Structure giving the sizes of the above arrays.

.It Li kern.profiling.state ( GPROF_STATE )

Profiling state.

If set to GMON_PROF_ON, starts profiling.

If set to

If set to GMON_PROF_OFF, stops profiling.

.Dv GMON_PROF_ON ,

starts profiling.

If set to

.Dv GMON_PROF_OFF ,

stops profiling.

.It Li kern.profiling.tos ( GPROF_TOS )

Array of

.Va struct tostruct

.Vt struct tostruct

describing destination of calls and their counts.

.El

.\" .It Li kern.pset

Line 926 See

Line 1059 See

Maximum amount of kernel memory to be used for socket buffers.

.\" XXX units?

.It Li kern.synchronized_io ( KERN_SYNCHRONIZED_IO )

Returns 1 if the POSIX 1003.1b Synchronized I/O Option is available

Returns 1 if the

on this system,

.St -p1003.1b-93

otherwise 0.

Synchronized I/O Option is available on this system,

otherwise\ 0.

.It Li kern.timecounter ( dynamic )

Display and control the timecounter source of the system.

.Bl -column "kern.timecounter.timestepwarnings" "integer" "Changeable" -offset indent

Line 1007 Each mount will be under its own

Line 1141 Each mount will be under its own

.No tableN

node.

Under each node there will be three variables, indicating the mount

point, the file-system type, and the number of entries.

point, the file system type, and the number of entries.

.It Li kern.veriexec.strict

Controls the strict level of Veriexec.

See

Line 1032 the system.

Line 1166 the system.

The returned data consists of an array whose size depends on the

current number of such objects in the system.

Each element of the array contains the kernel address of a vnode

.Va struct vnode *

.Vt struct vnode *

followed by the vnode itself

.Va struct vnode .

.Vt struct vnode .

.\" XXX: Undocumented: kern.lwp: no children?

.El

.Sh The machdep.* subtree

.Ss The machdep.* subtree

The set of variables defined is architecture dependent.

Most architectures define at least the following variables.

.Bl -column "machdep.booted_kernel" "Type" "Changeable" -offset indent

Line 1045 Most architectures define at least the f

Line 1179 Most architectures define at least the f

.It Li machdep.booted_kernel string no

.El

.\" XXX: Document the above.

.Sh The net.* subtree

.Ss The net.* subtree

The string and integer information available for the

.Li net

level is detailed below.

Line 1070 The data is returned as a sequence of ro

Line 1204 The data is returned as a sequence of ro

for the header file, format and meaning).

The length of each message is contained in the message header.

.Pp

The third level name is a protocol number, which is currently always 0.

The third level name is a protocol number, which is currently always\ 0.

The fourth level name is an address family, which may be set to 0 to

select all address families.

The fifth and sixth level names are as follows:

Line 1548 The number of IPv6 extension headers per

Line 1682 The number of IPv6 extension headers per

If set to 0, the node will accept as many extension headers as possible.

.It Li ip6.hashsize

The size of IPv6 Fast Forward hash table.

This value must be a power of 2 (64, 256...).

This value must be a power of 2 (64, 256, ...).

A larger hash table size results in fewer collisions.

Also see

.Li ip6.maxflows .

Line 1739 The variables are as follows:

Line 1873 The variables are as follows:

.It Li debug

Turn on debugging message from within the kernel.

The value is a bitmap, as defined in

.Pa /usr/include/netkey/key_debug.h .

.In netkey/key_debug.h .

.It Li spi_try

The number of times the kernel will try to obtain an unique SPI

when it generates it from random number generator.

Line 1770 The value is used when the kernel create

Line 1904 The value is used when the kernel create

on ACQUIRE PF_KEY message.

.El

.Sh The proc.* subtree

.Ss The proc.* subtree

The string and integer information available for the

.Li proc

level is detailed below.

Line 1798 The template used for the core dump file

Line 1932 The template used for the core dump file

.Xr core 5

for details).

The base name must either be

.Nm core

.Pa core

or end with the suffix ``.core'' (the super-user may set arbitrary names).

or end with the suffix

By default it points to KERN_DEFCORENAME.

.Pa .core

(the super-user may set arbitrary names).

By default it points to

.Dv KERN_DEFCORENAME .

.It Li proc.pid.rlimit ( PROC_PID_LIMIT )

Return resources limits, as defined for the

.Xr getrlimit 2

Line 1808 and

Line 1945 and

.Xr setrlimit 2

system calls.

The fourth level name is one of:

.Bl -tag -width PROC_PID_LIMIT_MEMLOCKAA

.Bl -tag -width "123456"

.It Li proc.pid.rlimit.cputime ( PROC_PID_LIMIT_CPU )

The maximum amount of CPU time (in seconds) to be used by each process.

.It Li proc.pid.rlimit.filesize ( PROC_PID_LIMIT_FSIZE )

Line 1852 options.

Line 1989 options.

.El

.Pp

The fifth level name is one of

.Li soft ( PROC_PID_LIMIT_TYPE_SOFT ) or

.Li soft ( PROC_PID_LIMIT_TYPE_SOFT )

.Li hard ( PROC_PID_LIMIT_TYPE_HARD ) ,

to select respectively the soft or hard limit.

Both are of type integer.

Line 1902 before it disappears.

Line 2040 before it disappears.

.Pp

This value is also inherited by the process's children.

.El

.Sh The user.* subtree ( CTL_USER )

.Ss The user.* subtree ( CTL_USER )

The string and integer information available for the

.Li user

level is detailed below.

Line 1970 The maximum length in bytes of a text-pr

Line 2108 The maximum length in bytes of a text-pr

line.

.It Li user.posix2_char_term ( USER_POSIX2_CHAR_TERM )

Return 1 if the system supports at least one terminal type capable of

all operations described in POSIX 1003.2, otherwise 0.

all operations described in

.St -p1003.2 ,

otherwise\ 0.

.It Li user.posix2_c_bind ( USER_POSIX2_C_BIND )

Return 1 if the system's C-language development facilities support the

C-Language Bindings Option, otherwise 0.

C-Language Bindings Option, otherwise\ 0.

.It Li user.posix2_c_dev ( USER_POSIX2_C_DEV )

Return 1 if the system supports the C-Language Development Utilities Option,

otherwise 0.

otherwise\ 0.

.It Li user.posix2_fort_dev ( USER_POSIX2_FORT_DEV )

Return 1 if the system supports the FORTRAN Development Utilities Option,

otherwise 0.

otherwise\ 0.

.It Li user.posix2_fort_run ( USER_POSIX2_FORT_RUN )

Return 1 if the system supports the FORTRAN Runtime Utilities Option,

otherwise 0.

otherwise\ 0.

.It Li user.posix2_localedef ( USER_POSIX2_LOCALEDEF )

Return 1 if the system supports the creation of locales, otherwise 0.

Return 1 if the system supports the creation of locales, otherwise\ 0.

.It Li user.posix2_sw_dev ( USER_POSIX2_SW_DEV )

Return 1 if the system supports the Software Development Utilities Option,

otherwise 0.

otherwise\ 0.

.It Li user.posix2_upe ( USER_POSIX2_UPE )

Return 1 if the system supports the User Portability Utilities Option,

otherwise 0.

otherwise\ 0.

.It Li user.posix2_version ( USER_POSIX2_VERSION )

The version of POSIX 1003.2 with which the system attempts to comply.

The version of

.St -p1003.2

with which the system attempts to comply.

.It Li user.re_dup_max ( USER_RE_DUP_MAX )

The maximum number of repeated occurrences of a regular expression

permitted when using interval notation.

Line 2003 at any one time.

Line 2145 at any one time.

The minimum maximum number of types supported for the name of a

timezone.

.El

.Sh The vm.* subtree ( CTL_VM )

.Ss The vm.* subtree ( CTL_VM )

The string and integer information available for the

.Li vm

level is detailed below.

Line 2063 cached file data.

Line 2205 cached file data.

.It Li vm.loadavg ( VM_LOADAVG )

Return the load average history.

The returned data consists of a

.Va struct loadavg .

.Vt struct loadavg .

.It Li vm.maxslp ( VM_MAXSLP )

The value of the maxslp kernel global variable.

.It Li vm.vmmeter ( VM_METER )

Return system wide virtual memory statistics.

The returned data consists of a

.Va struct vmtotal .

.Vt struct vmtotal .

.It vm.user_va0_disable

A flag which controls whether user processes can map virtual address 0.

A flag which controls whether user processes can map virtual address\ 0.

.It Li vm.uspace ( VM_USPACE )

The number of bytes allocated for each kernel stack.

.It Li vm.uvmexp ( VM_UVMEXP )

Return system wide virtual memory statistics.

The returned data consists of a

.Va struct uvmexp .

.Vt struct uvmexp .

.It Li vm.uvmexp2 ( VM_UVMEXP2 )

Return system wide virtual memory statistics.

The returned data consists of a

.Va struct uvmexp_sysctl .

.Vt struct uvmexp_sysctl .

.\" XXX vm.idlezero

.El

.Sh The ddb.* subtree ( CTL_DDB )

.Ss The ddb.* subtree ( CTL_DDB )

The information available for the

.Li ddb

level is detailed below.

Line 2136 nodes are also available as variables fr

Line 2278 nodes are also available as variables fr

See

.Xr ddb 4

for more details.

.Sh The security.* subtree ( CTL_SECURITY )

.Ss The security.* subtree ( CTL_SECURITY )

The

.Li security

level contains various security-related settings for

Line 2278 Number of seconds to suspend a user from

Line 2420 Number of seconds to suspend a user from

limit was exceeded.

.El

.Sh The vendor.* subtree ( CTL_VENDOR )

.Ss The vendor.* subtree ( CTL_VENDOR )

The

.Li vendor

toplevel name is reserved to be used by vendors who wish to

CVSweb <webmaster@jp.NetBSD.org>