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Diff for /src/share/man/man7/sysctl.7 between version 1.16 and 1.131

version 1.16, 2008/10/07 09:36:17 version 1.131, 2018/09/06 10:09:29
Line 29 
Line 29 
 .\"  .\"
 .\"     @(#)sysctl.3    8.4 (Berkeley) 5/9/95  .\"     @(#)sysctl.3    8.4 (Berkeley) 5/9/95
 .\"  .\"
 .Dd September 21, 2008  .Dd September 6, 2018
 .Dt SYSCTL 7  .Dt SYSCTL 7
 .Os  .Os
 .Sh NAME  .Sh NAME
Line 68  sysctl variable relative to the upper le
Line 68  sysctl variable relative to the upper le
 See the  See the
 .Xr sysctl 3  .Xr sysctl 3
 manual page for programming examples.  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
 .Aq Pa sys/sysctl.h ,  .Va CTL_
   prefix in
   .In sys/sysctl.h ,
 and are as follows.  and are as follows.
 The next and subsequent levels down are found in the include files  The next and subsequent levels down are found in the include files
 listed here, and described in separate sections below.  listed here, and described in separate sections below.
 .Bl -column securityXX CTLXSECURITYXX "Next level namesXX"  .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  .El
 .Sh The debug.* subtree  .Ss The debug.* subtree
 The debugging variables vary from system to system.  The debugging variables vary from system to system.
 A debugging variable may be added or deleted without need to recompile  A debugging variable may be added or deleted without need to recompile
 .Nm  .Nm
Line 100  Each time it runs,
Line 102  Each time it runs,
 gets the list of debugging variables from the kernel and  gets the list of debugging variables from the kernel and
 displays their current values.  displays their current values.
 The system defines twenty  The system defines twenty
 .Va ( struct ctldebug )  .Vt ( struct ctldebug )
 variables named  variables named
 .Dv debug0  .Dv debug0
 through  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  The loader prevents multiple use of the same variable by issuing errors
 if a variable is initialized in more than one place.  if a variable is initialized in more than one place.
 For example, to export the variable  For example, to export the variable
 .Dv dospecialcheck  .Va dospecialcheck
 as a debugging variable, the following declaration would be used:  as a debugging variable, the following declaration would be used:
   .Pp
 .Bd -literal -offset indent -compact  .Bd -literal -offset indent -compact
 int dospecialcheck = 1;  int dospecialcheck = 1;
 struct ctldebug debug5 = { "dospecialcheck", \*[Am]dospecialcheck };  struct ctldebug debug5 = { "dospecialcheck", &dospecialcheck };
 .Ed  .Ed
 .Pp  .Pp
 Note that the dynamic implementation of  Note that the dynamic implementation of
Line 127  See
Line 130  See
 .\" and  .\" and
 .\" .Xr sysctl 9  .\" .Xr sysctl 9
 for more information.  for more information.
 .Sh The vfs.* subtree  .Ss The vfs.* subtree
 A distinguished second level name,  A distinguished second level name,
 .Li vfs.generic ( VFS_GENERIC ) ,  .Li vfs.generic ( Dv VFS_GENERIC ) ,
 is used to get general information about all filesystems.  is used to get general information about all file systems.
 One of its third level identifiers is  It has the following third level identifiers:
 .Li vfs.generic.maxtypenum ( VFS_MAXTYPENUM )  .Bl -tag -width "123456"
 that gives the highest valid filesystem type number.  .It Li vfs.generic.maxtypenum ( Dv VFS_MAXTYPENUM )
 Its other third level identifier is  The highest valid file system type number.
 .Li vfs.generic.conf ( VFS_CONF )  .It Li vfs.generic.conf ( Dv VFS_CONF )
 that returns configuration information about the filesystem  Returns configuration information about the file system type given as a fourth
 type given as a fourth level identifier.  level identifier.
 The remaining second level identifiers are the  .It Li vfs.generic.usermount ( Dv VFS_USERMOUNT )
 filesystem type number returned by a  Determines if non superuser mounts are allowed, defaults to
   .Dv 0 .
   .It Li vfs.generic.magiclinks ( Dv 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 variables supported are described in
   .Xr symlink 7
   under
   .Dq "MAGIC SYMLINKS" .
   .El
   .Pp
   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 integrity
   of file system metadata in the event of a power loss.
   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  .Xr statvfs 2
 call or from  call or from
 .Li vfs.generic.conf .  .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  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  The string and integer information available for the
 .Li hw  .Li hw
 level is detailed below.  level is detailed below.
 The changeable column shows whether a process with appropriate  The changeable column shows whether a process with appropriate
 privilege may change the value.  privilege may change the value.
 .Bl -column "Second level nameXXXXXX" "struct disk_sysctlXXX" -offset indent  .Bl -column "hw.machine_arch" "integer" "Changeable" -offset indent
 .It Sy Second level name        Type    Changeable  .It Sy Second level name Ta Sy Type Ta Sy Changeable
 .It hw.acpi.supported_states    string  no  
 .It hw.alignbytes       integer no  .It hw.alignbytes       integer no
 .It hw.byteorder        integer no  .It hw.byteorder        integer no
 .It hw.cnmagic  string  yes  .It hw.cnmagic  string  yes
Line 164  privilege may change the value.
Line 198  privilege may change the value.
 .It hw.machine_arch     string  no  .It hw.machine_arch     string  no
 .It hw.model    string  no  .It hw.model    string  no
 .It hw.ncpu     integer no  .It hw.ncpu     integer no
   .It hw.ncpuonline       integer no
 .It hw.pagesize integer no  .It hw.pagesize integer no
 .It hw.physmem  integer no  .It hw.physmem  integer no
 .It hw.physmem64        quad    no  .It hw.physmem64        quad    no
 .It hw.usermem  integer no  .It hw.usermem  integer no
 .It hw.usermem64        quad    no  .It hw.usermem64        quad    no
 .El  .El
 .Pp  
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .It Li hw.acpi.support_states  .It Li hw.alignbytes ( Dv HW_ALIGNBYTES )
 List of possible  
 .Tn ACPI  
 sleep states.  
 The list can contain the following values:  
 .Bl -tag -width XS1X  
 .It S0  
 fully running  
 .It S1  
 power on suspend (CPU and hard disks are off)  
 .It S2  
 similar to S3, usually not implemented  
 .It S3  
 suspend-to-RAM  
 .It S4  
 suspend-to-disk (needs BIOS support)  
 .It S5  
 power off  
 .El  
 .It Li hw.alignbytes ( HW_ALIGNBYTES )  
 Alignment constraint for all possible data types.  Alignment constraint for all possible data types.
 This shows the value  This shows the value
 .Dv ALIGNBYTES  .Dv ALIGNBYTES
 in  in
 .Pa /usr/include/machine/param.h ,  .In machine/param.h ,
 at the kernel compilation time.  at the kernel compilation time.
 .It Li hw.byteorder ( HW_BYTEORDER )  .It Li hw.byteorder ( Dv HW_BYTEORDER )
 The byteorder (4,321, or 1,234).  The byteorder (4321, or 1234).
 .It Li hw.cnmagic ( HW_CNMAGIC )  .It Li hw.cnmagic ( Dv HW_CNMAGIC )
 The console magic key sequence.  The console magic key sequence.
 .It Li hw.disknames ( HW_DISKNAMES )  .It Li hw.disknames ( Dv HW_DISKNAMES )
 The list of (space separated) disk device names on the system.  The list of (space separated) disk device names on the system.
 .It Li hw.iostatnames ( HW_IOSTATNAMES )  .It Li hw.iostatnames ( Dv HW_IOSTATNAMES )
 A space separated list of devices that will have I/O statistics  A space separated list of devices that will have I/O statistics
 collected on them.  collected on them.
 .It Li hw.iostats ( HW_IOSTATS )  .It Li hw.iostats ( Dv HW_IOSTATS )
 Return statistical information on the NFS mounts, disk and tape  Return statistical information on the NFS mounts, disk and tape
 devices on the system.  devices on the system.
 An array of  An array of
 .Va struct io_sysctl  .Vt struct io_sysctl
 structures is returned,  structures is returned,
 whose size depends on the current number of such objects in the system.  whose size depends on the current number of such objects in the system.
 The third level name is the size of the  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  The type of object can be determined by examining the
 .Va type  .Va type
 element of  element of
 .Va struct io_sysctl .  .Vt struct io_sysctl .
 Which can be  Which can be
 .Dv IOSTAT_DISK  .Dv IOSTAT_DISK
 (disk drive),  (disk drive),
Line 227  Which can be
Line 242  Which can be
 (tape drive), or  (tape drive), or
 .Dv IOSTAT_NFS  .Dv IOSTAT_NFS
 (NFS mount).  (NFS mount).
 .It Li hw.machine ( HW_MACHINE )  .It Li hw.machine ( Dv HW_MACHINE )
 The machine class.  The machine class.
 .It Li hw.machine_arch ( HW_MACHINE_ARCH )  .It Li hw.machine_arch ( Dv HW_MACHINE_ARCH )
 The machine CPU class.  The machine CPU class.
 .It Li hw.model ( HW_MODEL )  .It Li hw.model ( Dv HW_MODEL )
 The machine model.  The machine model.
 .It Li hw.ncpu ( HW_NCPU )  .It Li hw.ncpu ( Dv HW_NCPU )
 The number of CPUs.  The number of CPUs configured.
 .ne 1i  .It Li hw.ncpuonline ( Dv HW_NCPUONLINE )
 .It Li hw.pagesize ( HW_PAGESIZE )  The number of CPUs online.
   .It Li hw.pagesize ( Dv HW_PAGESIZE )
 The software page size.  The software page size.
 .It Li hw.physmem ( HW_PHYSMEM )  .It Li hw.physmem ( Dv HW_PHYSMEM )
 The bytes of physical memory as a 32-bit integer.  The bytes of physical memory as a 32-bit integer.
 .It Li hw.physmem64 ( HW_PHYSMEM64 )  .It Li hw.physmem64 ( Dv HW_PHYSMEM64 )
 The bytes of physical memory as a 64-bit integer.  The bytes of physical memory as a 64-bit integer.
 .It Li hw.usermem ( HW_USERMEM )  .It Li hw.usermem ( Dv HW_USERMEM )
 The bytes of non-kernel memory as a 32-bit integer.  The bytes of non-kernel memory as a 32-bit integer.
 .It Li hw.usermem64 ( HW_USERMEM64 )  .It Li hw.usermem64 ( Dv HW_USERMEM64 )
 The bytes of non-kernel memory as a 64-bit integer.  The bytes of non-kernel memory as a 64-bit integer.
 .El  .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  The string and integer information available for the
 .Li kern  .Li kern
 level is detailed below.  level is detailed below.
 The changeable column shows whether a process with appropriate  The changeable column shows whether a process with appropriate
 privilege may change the value.  privilege may change the value.
 The types of data currently available are process information,  .Bl -column "kern.posix_reader_writer_locks" \
 system vnodes, the open file entries, routing table entries,  "struct kinfo_drivers" "not applicable"
 virtual memory statistics, load average history, and clock rate  .It Sy Second level name Ta Sy Type Ta Sy Changeable
 information.  .It kern.aio_listio_max integer yes
 .Bl -column "kern.posix_reader_writer_locks" "struct clockrateXXX" -offset indent  .It kern.aio_max        integer yes
 .It Sy Second level name        Type    Changeable  .It kern.arandom        integer no
 .It kern.argmax integer no  .It kern.argmax integer no
 .It kern.autonicetime   integer yes  .It kern.boothowto      integer no
 .It kern.autoniceval    integer yes  
 .It kern.boottime       struct timeval  no  .It kern.boottime       struct timeval  no
 .It kern.bufq   node    not applicable  .It kern.buildinfo      string  no
   .\".It kern.bufq        node    not applicable
 .It kern.ccpu   integer no  .It kern.ccpu   integer no
 .It kern.clockrate      struct clockinfo        no  .It kern.clockrate      struct clockinfo        no
 .It kern.consdev        integer no  .It kern.consdev        integer no
 .It kern.cp\_id struct  no  .It kern.coredump       node    not applicable
 .It kern.cp\_time       uint64_t[\|]    no  .It kern.cp_id  struct  no
   .It kern.cp_time        uint64_t[\|]    no
   .It kern.cryptodevallowsoft     integer yes
 .It kern.defcorename    string  yes  .It kern.defcorename    string  yes
   .It kern.detachall      integer yes
 .It kern.domainname     string  yes  .It kern.domainname     string  yes
 .It kern.drivers        struct kinfo_drivers    no  .It kern.drivers        struct kinfo_drivers    no
   .It kern.dump_on_panic  integer yes
 .It kern.file   struct file     no  .It kern.file   struct file     no
 .It kern.forkfsleep     integer yes  .It kern.forkfsleep     integer yes
 .It kern.fscale integer no  .It kern.fscale integer no
 .It kern.fsync  integer no  .It kern.fsync  integer no
 .It kern.hardclock\_ticks       integer no  .It kern.hardclock_ticks        integer no
 .It kern.hostid integer yes  .It kern.hostid integer yes
 .It kern.hostname       string  yes  .It kern.hostname       string  yes
 .It kern.iov\_max       integer no  .It kern.iov_max        integer no
 .It kern.job\_control   integer no  .It kern.ipc    node    not applicable
   .It kern.job_control    integer no
 .It kern.labeloffset    integer no  .It kern.labeloffset    integer no
 .It kern.labelsector    integer no  .It kern.labelsector    integer no
 .It kern.login\_name\_max       integer no  .It kern.login_name_max integer no
 .It kern.logsigexit     integer yes  .It kern.logsigexit     integer yes
 .It kern.mapped\_files  integer no  .It kern.mapped_files   integer no
 .It kern.maxfiles       integer yes  .It kern.maxfiles       integer yes
   .It kern.maxlwp integer yes
 .It kern.maxpartitions  integer no  .It kern.maxpartitions  integer no
 .It kern.maxphys        integer no  .It kern.maxphys        integer no
 .It kern.maxproc        integer yes  .It kern.maxproc        integer yes
 .It kern.maxptys        integer yes  .It kern.maxptys        integer yes
 .It kern.maxvnodes      integer yes  .It kern.maxvnodes      integer yes
   .It kern.messages       integer yes
 .It kern.mbuf   node    not applicable  .It kern.mbuf   node    not applicable
 .It kern.memlock        integer no  .It kern.memlock        integer no
 .It kern.memlock\_range integer no  .It kern.memlock_range  integer no
 .It kern.memory\_protection     integer no  .It kern.memory_protection      integer no
 .It kern.monotonic\_clock       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.msgbuf integer no
 .It kern.msgbufsize     integer no  .It kern.msgbufsize     integer no
 .It kern.ngroups        integer no  .It kern.ngroups        integer no
   .\".It kern.no_sa_support       integer yes
 .It kern.ntptime        struct ntptimeval       no  .It kern.ntptime        struct ntptimeval       no
 .It kern.osrelease      string  no  .It kern.osrelease      string  no
 .It kern.osrev  integer no  .It kern.osrevision     integer no
 .It kern.ostype string  no  .It kern.ostype string  no
   .\".It kern.panic_now   integer yes
 .It kern.pipe   node    not applicable  .It kern.pipe   node    not applicable
 .It kern.posix1 integer no  .It kern.pool   struct pool_sysctl      no
 .It kern.posix\_barriers        integer no  .\" .It kern.posix      node    not applicable
 .It kern.posix\_reader\_writer\_locks   integer no  .It kern.posix1version  integer no
 .It kern.posix\_semaphores      integer no  .It kern.posix_aio      integer no
 .It kern.posix\_spin\_locks     integer no  .It kern.posix_barriers integer no
 .It kern.posix\_threads integer no  .It kern.posix_reader_writer_locks      integer no
 .It kern.posix\_timers  integer no  .\".It kern.posix_sched integer yes
   .It kern.posix_semaphores       integer no
   .It kern.posix_spin_locks       integer no
   .It kern.posix_threads  integer no
   .It kern.posix_timers   integer no
 .It kern.proc   struct kinfo_proc       no  .It kern.proc   struct kinfo_proc       no
 .It kern.proc2  struct kinfo_proc2      no  .It kern.proc2  struct kinfo_proc2      no
 .It kern.proc\_args     string  no  .It kern.proc_args      string  no
 .It kern.prof   node    not applicable  .It kern.profiling      node    not applicable
   .\".It kern.pset        node    not applicable
 .It kern.rawpartition   integer no  .It kern.rawpartition   integer no
 .It kern.root\_device   string  no  .It kern.root_device    string  no
 .It kern.root\_partition        integer no  .It kern.root_partition integer no
 .It kern.rtc\_offset    integer yes  .It kern.rtc_offset     integer yes
 .It kern.saved\_ids     integer no  .It kern.saved_ids      integer no
   .It kern.sbmax  integer yes
   .It kern.sched  node    not applicable
 .It kern.securelevel    integer raise only  .It kern.securelevel    integer raise only
 .It kern.synchronized\_io       integer no  .It kern.somaxkva       integer yes
 .It kern.ipc    node    not applicable  .It kern.synchronized_io        integer no
   .It kern.timecounter    node    not applicable
 .It kern.timex  struct  no  .It kern.timex  struct  no
 .It kern.tkstat node    not applicable  .It kern.tkstat node    not applicable
   .It kern.tty    node    not applicable
 .It kern.urandom        integer no  .It kern.urandom        integer no
   .It kern.usercrypto     integer yes
   .It kern.userasymcrypto integer yes
   .It kern.veriexec       node    not applicable
 .It kern.version        string  no  .It kern.version        string  no
 .It kern.vnode  struct vnode    no  .It kern.vnode  struct vnode    no
 .El  .El
 .ne 1i  
 .Pp  
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .It Li kern.argmax ( KERN_ARGMAX )  .It Li kern.aio_listio_max
   The maximum number of asynchronous 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
   .Pf ( RNG )
   is based on
   .Xr arc4random 3 .
   .It Li kern.argmax ( Dv KERN_ARGMAX )
 The maximum bytes of argument to  The maximum bytes of argument to
 .Xr execve 2 .  .Xr execve 2 .
 .It Li kern.autonicetime ( KERN_AUTONICETIME )  .It Li kern.boothowto
 The number of seconds of CPU-time a non-root process may accumulate before  Flags passed from the boot loader; see
 having its priority lowered from the default to the value of KERN_AUTONICEVAL.  .Xr reboot 2
 If set to 0, automatic lowering of priority is not performed, and if set to \-1  for the meanings of the flags.
 all non-root processes are immediately lowered.  .It Li kern.boottime ( Dv KERN_BOOTTIME )
 .It Li kern.autoniceval ( KERN_AUTONICEVAL )  
 The priority assigned for automatically niced processes.  
 .It Li kern.boottime ( KERN_BOOTTIME )  
 A  A
 .Va struct timeval  .Vt struct timeval
 structure is returned.  structure is returned.
 This structure contains the time that the system was booted.  This structure contains the time that the system was booted.
 .It Li kern.ccpu ( KERN_CCPU )  .It Li kern.bufq
   This variable contains information on the
   .Xr bufq 9
   subsystem.
   Currently, the only third level name implemented is
   .Dv kern.bufq.strategies
   which provides a list of buffer queue strategies currently available.
   .It Li kern.buildinfo
   When the kernel is built, the build environment may optionally provide
   arbitrary information to be stored in this variable.
   .It Li kern.ccpu ( Dv KERN_CCPU )
 The scheduler exponential decay value.  The scheduler exponential decay value.
 .It Li kern.clockrate ( KERN_CLOCKRATE )  .It Li kern.clockrate ( Dv KERN_CLOCKRATE )
 A  A
 .Va struct clockinfo  .Vt struct clockinfo
 structure is returned.  structure is returned.
 This structure contains the clock, statistics clock and profiling clock  This structure contains the clock, statistics clock and profiling clock
 frequencies, the number of micro-seconds per hz tick, and the clock  frequencies, the number of micro-seconds per hz tick, and the clock
 skew rate.  skew rate.
 .It Li kern.consdev ( KERN_CONSDEV )  Refer to
   .Xr hz 9
   for additional details.
   .It Li kern.consdev ( Dv KERN_CONSDEV )
 Console device.  Console device.
 .It Li kern.cp_id ( KERN_CP_ID )  .It Li kern.coredump
   Settings related to set-id processes coredumps.
   By default, set-id processes do not dump core in situations where
   other processes would.
   The settings in this node allows an administrator to change this
   behavior.
   .Pp
   The third level name is
   .Dv kern.coredump.setid
   and fourth level variables are described below.
   .Bl -column "kern.coredump.setid.group" "integer" "Changeable" -offset indent
   .It Sy Fourth level name Ta Sy Type Ta Sy Changeable
   .It kern.coredump.setid.dump    integer yes
   .It kern.coredump.setid.group   integer yes
   .It kern.coredump.setid.mode    integer yes
   .It kern.coredump.setid.owner   integer yes
   .It kern.coredump.setid.path    string  yes
   .El
   .Bl -tag -width "123456"
   .It Li kern.coredump.setid.dump
   If non-zero, set-id processes will dump core.
   .It Li kern.coredump.setid.group
   The group-id for the set-id processes' coredump.
   .It Li kern.coredump.setid.mode
   The mode for the set-id processes' coredump.
   See
   .Xr chmod 1 .
   .It Li kern.coredump.setid.owner
   The user-id that will be used as the owner of the set-id processes'
   coredump.
   .It Li kern.coredump.setid.path
   The path to which set-id processes' coredumps will be saved to.
   Same syntax as kern.defcorename.
   .El
   .It Li kern.cp_id ( Dv KERN_CP_ID )
 Mapping of CPU number to CPU id.  Mapping of CPU number to CPU id.
 .It Li kern.cp_time ( KERN_CP_TIME )  .It Li kern.cp_time ( Dv 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  This array contains the
 number of clock ticks spent in different CPU states.  number of clock ticks spent in different CPU states.
 On multi-processor systems, the sum across all CPUs is returned unless  On multi-processor systems, the sum across all CPUs is returned unless
 appropriate space is given for one data set for each CPU.  appropriate space is given for one data set for each CPU.
 Data for a specific CPU can also be obtained by adding the number of the  Data for a specific CPU can also be obtained by adding the number of the
 CPU at the end of the MIB, enlarging it by one.  CPU at the end of the MIB, enlarging it by one.
 .It Li kern.defcorename ( KERN_DEFCORENAME )  .It Li kern.cryptodevallowsoft
   This variable controls userland access to hardware versus software transforms
   in the
   .Xr crypto 4
   system.
   The available values are as follows:
   .Bl -tag -width XX0 -offset indent
   .It Dv < 0
   Always force userlevel requests to use software transforms.
   .It Dv = 0
   If present, use hardware and grant userlevel requests for
   non-accelerated transforms (handling the latter in software).
   .It Dv > 0
   Allow user requests only for transforms which are hardware-accelerated.
   .El
   .It Li kern.defcorename ( Dv KERN_DEFCORENAME )
 Default template for the name of core dump files (see also  Default template for the name of core dump files (see also
 .Li proc.pid.corename  .Li proc.pid.corename
 in the per-process variables  in the per-process variables
Line 378  and
Line 492  and
 .Xr core 5  .Xr core 5
 for format of this template).  for format of this template).
 The default value is  The default value is
 .Nm %n.core  .Pa %n.core
 and can be changed with the kernel configuration option  and can be changed with the kernel configuration option
 .Cd options DEFCORENAME  .Cd options DEFCORENAME
 (see  (see
 .Xr options 4  .Xr options 4
 ).  ).
 .It Li kern.domainname ( KERN_DOMAINNAME )  .It Li kern.detachall
   Detach all devices at shutdown.
   .It Li kern.domainname ( Dv KERN_DOMAINNAME )
 Get or set the YP domain name.  Get or set the YP domain name.
 .It Li kern.dump_on_panic ( KERN_DUMP_ON_PANIC )  .It Li kern.drivers ( Dv KERN_DRIVERS )
 Perform a crash dump on system panic.  
 .It Li kern.drivers ( KERN_DRIVERS )  
 Return an array of  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  that contains the name and major device numbers of all the device drivers
 in the current kernel.  in the current kernel.
 The  The
Line 399  field is always a NUL terminated string.
Line 513  field is always a NUL terminated string.
 The  The
 .Va d_bmajor  .Va d_bmajor
 field will be set to \-1 if the driver doesn't have a block device.  field will be set to \-1 if the driver doesn't have a block device.
 .It Li kern.file ( KERN_FILE )  .It Li kern.dump_on_panic ( Dv KERN_DUMP_ON_PANIC )
   Perform a crash dump on system
   .Xr panic 9 .
   .It Li kern.file ( Dv KERN_FILE )
 Return the entire file table.  Return the entire file table.
 The returned data consists of a single  The returned data consists of a single
 .Va struct filelist  .Vt struct filelist
 followed by an array of  followed by an array of
 .Va struct file ,  .Vt struct file ,
 whose size depends on the current number of such objects in the system.  whose size depends on the current number of such objects in the system.
 .It Li kern.forkfsleep ( KERN_FORKFSLEEP )  .It Li kern.forkfsleep ( Dv KERN_FORKFSLEEP )
 If  If
 .Xr fork 2  .Xr fork 2
 system call fails due to limit on number of processes (either  system call fails due to limit on number of processes (either
Line 417  error to process.
Line 534  error to process.
 Useful to keep heavily forking runaway processes in bay.  Useful to keep heavily forking runaway processes in bay.
 Default zero (no sleep).  Default zero (no sleep).
 Maximum is 20 seconds.  Maximum is 20 seconds.
 .It Li kern.fscale ( KERN_FSCALE )  .It Li kern.fscale ( Dv KERN_FSCALE )
 The kernel fixed-point scale factor.  The kernel fixed-point scale factor.
 .It Li kern.fsync ( KERN_FSYNC )  .It Li kern.fsync ( Dv 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,  on this system,
 otherwise 0.  otherwise\ 0.
 .It Li kern.hardclock_ticks ( KERN_HARDCLOCK_TICKS )  .It Li kern.hardclock_ticks ( Dv KERN_HARDCLOCK_TICKS )
 Returns the number of  Returns the number of
 .Xr hardclock 9  .Xr hardclock 9
 ticks.  ticks.
 .It Li kern.hostid ( KERN_HOSTID )  .It Li kern.hist
 Get or set the host id.  This variable contains kernel history data if the kernel was
 .It Li kern.hostname ( KERN_HOSTNAME )  configured for any of the options
 Get or set the hostname.  .Dv UVHMIST ,
 .It Li kern.iov_max ( KERN_IOV_MAX )  .Dv USB_DEBUG ,
   .Dv BIOHIST ,
   or
   .Dv SCDEBUG .
   (See
   .Xr options 4
   for more details.)
   The third-level names correspond to each available history table.
   The values of the history tables are in an internal format, and can be
   decoded by the
   .Xr vmstat 1
   utility's
   .Fl U
   and
   .Fl u
   options;
   the
   .Fl l
   option can be used to see which tables are available.
   .It Li kern.hostid ( Dv KERN_HOSTID )
   Get or set the host identifier.
   This is aimed to replace the legacy
   .Xr gethostid 3
   and
   .Xr sethostid 3
   system calls.
   .It Li kern.hostname ( Dv KERN_HOSTNAME )
   Get or set the
   .Xr hostname 1 .
   .It Li kern.iov_max ( Dv KERN_IOV_MAX )
 Return the maximum number of  Return the maximum number of
 .Va iovec  .Vt iovec
 structures that a process has available for use with  structures that a process has available for use with
 .Xr preadv 2 ,  .Xr preadv 2 ,
 .Xr pwritev 2 ,  .Xr pwritev 2 ,
Line 442  structures that a process has available 
Line 590  structures that a process has available 
 .Xr sendmsg 2  .Xr sendmsg 2
 and  and
 .Xr writev 2 .  .Xr writev 2 .
 .It Li kern.job_control ( KERN_JOB_CONTROL )  .It Li kern.ipc ( Dv KERN_SYSVIPC )
 Return 1 if job control is available on this system, otherwise 0.  Return information about the SysV IPC parameters.
 .It Li kern.labeloffset ( KERN_LABELOFFSET )  The third level names for the ipc variables are detailed below.
 The offset within the sector specified by KERN_LABELSECTOR of the  .Bl -column "kern.ipc.shm_use_phys" "integer" "Changeable" -offset indent
   .It Sy Third level name Ta Sy Type Ta Sy Changeable
   .It kern.ipc.sysvmsg    integer no
   .It kern.ipc.sysvsem    integer no
   .It kern.ipc.sysvshm    integer no
   .It kern.ipc.sysvipc_info       struct  no
   .It kern.ipc.shmmax     integer yes
   .It kern.ipc.shmmni     integer yes
   .It kern.ipc.shmseg     integer yes
   .It kern.ipc.shmmaxpgs  integer yes
   .It kern.ipc.shm_use_phys       integer yes
   .It kern.ipc.msgmni     integer yes
   .It kern.ipc.msgseg     integer yes
   .It kern.ipc.semmni     integer yes
   .It kern.ipc.semmns     integer yes
   .It kern.ipc.semmnu     integer yes
   .El
   .Bl -tag -width "123456"
   .It Li kern.ipc.sysvmsg ( Dv KERN_SYSVIPC_MSG )
   Returns 1 if System V style message queue functionality is available
   on this system,
   otherwise\ 0.
   .It Li kern.ipc.sysvsem ( Dv KERN_SYSVIPC_SEM )
   Returns 1 if System V style semaphore functionality is available
   on this system,
   otherwise\ 0.
   .It Li kern.ipc.sysvshm ( Dv KERN_SYSVIPC_SHM )
   Returns 1 if System V style share memory functionality is available
   on this system,
   otherwise\ 0.
   .It Li kern.ipc.sysvipc_info ( Dv KERN_SYSVIPC_INFO )
   Return System V style IPC configuration and run-time information.
   The fourth level name selects the System V style IPC facility.
   .Bl -column "KERN_SYSVIPC_MSG_INFO" "struct shm_sysctl_info" -offset indent
   .It Sy Fourth level name Ta Sy Type
   .It KERN_SYSVIPC_MSG_INFO       struct msg_sysctl_info
   .It KERN_SYSVIPC_SEM_INFO       struct sem_sysctl_info
   .It KERN_SYSVIPC_SHM_INFO       struct shm_sysctl_info
   .El
   .Bl -tag -width "123456"
   .It Li KERN_SYSVIPC_MSG_INFO
   Return information on the System V style message facility.
   The
   .Sy msg_sysctl_info
   structure is defined in
   .In sys/msg.h .
   .It Li KERN_SYSVIPC_SEM_INFO
   Return information on the System V style semaphore facility.
   The
   .Sy sem_sysctl_info
   structure is defined in
   .In sys/sem.h .
   .It Li KERN_SYSVIPC_SHM_INFO
   Return information on the System V style shared memory facility.
   The
   .Sy shm_sysctl_info
   structure is defined in
   .In sys/shm.h .
   .El
   .It Li kern.ipc.shmmax ( Dv KERN_SYSVIPC_SHMMAX )
   Max shared memory segment size in bytes.
   .It Li kern.ipc.shmmni ( Dv KERN_SYSVIPC_SHMMNI )
   Max number of shared memory identifiers.
   .It Li kern.ipc.shmseg ( Dv KERN_SYSVIPC_SHMSEG )
   Max shared memory segments per process.
   .It Li kern.ipc.shmmaxpgs ( Dv KERN_SYSVIPC_SHMMAXPGS )
   Max amount of shared memory in pages.
   .It Li kern.ipc.shm_use_phys ( Dv KERN_SYSVIPC_SHMUSEPHYS )
   Locking of shared memory in physical memory.
   If 0, memory can be swapped
   out, otherwise it will be locked in physical memory.
   .It Li kern.ipc.msgmni
   Max number of message queue identifiers.
   .It Li kern.ipc.msgseg
   Max number of number of message segments.
   .It Li kern.ipc.semmni
   Max number of number of semaphore identifiers.
   .It Li kern.ipc.semmns
   Max number of number of semaphores in system.
   .It Li kern.ipc.semmnu
   Max number of undo structures in system.
   .El
   .It Li kern.job_control ( Dv KERN_JOB_CONTROL )
   Return 1 if job control is available on this system, otherwise\ 0.
   .It Li kern.labeloffset ( Dv KERN_LABELOFFSET )
   The offset within the sector specified by
   .Dv KERN_LABELSECTOR
   of the
 .Xr disklabel 5 .  .Xr disklabel 5 .
 .It Li kern.labelsector ( KERN_LABELSECTOR )  .It Li kern.labelsector ( Dv KERN_LABELSECTOR )
 The sector number containing the  The sector number containing the
 .Xr disklabel 5 .  .Xr disklabel 5 .
 .It Li kern.login_name_max ( KERN_LOGIN_NAME_MAX )  .It Li kern.login_name_max ( Dv KERN_LOGIN_NAME_MAX )
 The size of the storage required for a login name, in bytes,  The size of the storage required for a login name, in bytes,
 including the terminating NUL.  including the terminating NUL.
 .It Li kern.logsigexit ( KERN_LOGSIGEXIT )  .It Li kern.logsigexit ( Dv KERN_LOGSIGEXIT )
 If this flag is non-zero, the kernel will  If this flag is non-zero, the kernel will
 .Xr log 9  .Xr log 9
 all process exits due to signals which create a  all process exits due to signals which create a
 .Xr core 5  .Xr core 5
 file, and whether the coredump was created.  file, and whether the coredump was created.
 .It Li kern.mapped_files ( KERN_MAPPED_FILES )  .It Li kern.mapped_files ( Dv 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,
 .It Li kern.maxfiles ( KERN_MAXFILES )  otherwise\ 0.
   .It Li kern.maxfiles ( Dv KERN_MAXFILES )
 The maximum number of open files that may be open in the system.  The maximum number of open files that may be open in the system.
 .It Li kern.maxpartitions ( KERN_MAXPARTITIONS )  .It Li kern.maxpartitions ( Dv KERN_MAXPARTITIONS )
 The maximum number of partitions allowed per disk.  The maximum number of partitions allowed per disk.
 .It Li kern.maxphys ( KERN_MAXPHYS )  .It Li kern.maxlwp
   The maximum number of Lightweight Processes (threads) the system allows
   per uid.
   .It Li kern.maxphys ( Dv KERN_MAXPHYS )
 Maximum raw I/O transfer size.  Maximum raw I/O transfer size.
 .It Li kern.maxproc ( KERN_MAXPROC )  .It Li kern.maxproc ( Dv KERN_MAXPROC )
 The maximum number of simultaneous processes the system will allow.  The maximum number of simultaneous processes the system will allow.
 .It Li kern.maxptys ( KERN_MAXPTYS )  .It Li kern.maxptys ( Dv KERN_MAXPTYS )
 The maximum number of pseudo terminals.  The maximum number of pseudo terminals.
 This value can be both raised and lowered, though it cannot  This value can be both raised and lowered, though it cannot
 be set lower than number of currently used ptys.  be set lower than number of currently used ptys.
 See also  See also
 .Xr pty 4 .  .Xr pty 4 .
 .It Li kern.maxvnodes ( KERN_MAXVNODES )  .It Li kern.maxvnodes ( Dv KERN_MAXVNODES )
 The maximum number of vnodes available on the system.  The maximum number of vnodes available on the system.
 This can only be raised.  This can only be raised.
 .It Li kern.mbuf ( KERN_MBUF )  .It Li kern.mbuf ( Dv KERN_MBUF )
 Return information about the mbuf control variables.  Return information about the mbuf control variables.
 Mbufs are data structures which store network packets and other data  Mbufs are data structures which store network packets and other data
 structures in the networking code, see  structures in the networking code, see
Line 488  structures in the networking code, see
Line 727  structures in the networking code, see
 The third level names for the mbuf variables are detailed below.  The third level names for the mbuf variables are detailed below.
 The changeable column shows whether a process with appropriate  The changeable column shows whether a process with appropriate
 privilege may change the value.  privilege may change the value.
 .Bl -column "kern.mbuf.nmbclusters" "struct integerXXX" -offset indent  .Bl -column "kern.mbuf.nmbclusters" "integer" "Changeable" -offset indent
 .It Sy Third level name Type    Changeable  .It Sy Third level name Ta Sy Type Ta Sy Changeable
 .\" XXX Changeable? really?  .\" XXX Changeable? really?
 .It kern.mbuf.mblowat   integer yes  .It kern.mbuf.mblowat   integer yes
 .It kern.mbuf.mclbytes  integer yes  .It kern.mbuf.mclbytes  integer yes
Line 500  privilege may change the value.
Line 739  privilege may change the value.
 .Pp  .Pp
 The variables are as follows:  The variables are as follows:
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .It Li kern.mbuf.mblowat ( MBUF_MBLOWAT )  .It Li kern.mbuf.mblowat ( Dv MBUF_MBLOWAT )
 The mbuf low water mark.  The mbuf low water mark.
 .It Li kern.mbuf.mclbytes ( MBUF_MCLBYTES )  .It Li kern.mbuf.mclbytes ( Dv MBUF_MCLBYTES )
 The mbuf cluster size.  The mbuf cluster size.
 .It Li kern.mbuf.mcllowat ( MBUF_MCLLOWAT )  .It Li kern.mbuf.mcllowat ( Dv MBUF_MCLLOWAT )
 The mbuf cluster low water mark.  The mbuf cluster low water mark.
 .It Li kern.mbuf.msize ( MBUF_MSIZE )  .It Li kern.mbuf.msize ( Dv MBUF_MSIZE )
 The mbuf base size.  The mbuf base size.
 .It Li kern.mbuf.nmbclusters ( MBUF_NMBCLUSTERS )  .It Li kern.mbuf.nmbclusters ( Dv MBUF_NMBCLUSTERS )
 The limit on the number of mbuf clusters.  The limit on the number of mbuf clusters.
 The variable can only be increased, and only increased on machines with  The variable can only be increased, and only increased on machines with
 direct-mapped pool pages.  direct-mapped pool pages.
 .El  .El
 .It Li kern.memlock ( KERN_MEMLOCK )  .It Li kern.memlock ( Dv 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,
 .It Li kern.memlock_range ( KERN_MEMLOCK_RANGE )  otherwise\ 0.
 Returns 1 if the POSIX 1003.1b Range Memory Locking Option is available  .It Li kern.memlock_range ( Dv KERN_MEMLOCK_RANGE )
 on this system,  Returns 1 if the
 otherwise 0.  .St -p1003.1b-93
 .It Li kern.memory_protection ( KERN_MEMORY_PROTECTION )  Range Memory Locking Option is available on this system,
 Returns 1 if the POSIX 1003.1b Memory Protection Option is available  otherwise\ 0.
 on this system,  .It Li kern.memory_protection ( Dv KERN_MEMORY_PROTECTION )
 otherwise 0.  Returns 1 if the
 .It Li kern.monotonic_clock ( KERN_MONOTONIC_CLOCK )  .St -p1003.1b-93
 Returns the standard version the implementation of the POSIX 1003.1b  Memory Protection Option is available on this system,
   otherwise\ 0.
   .It Li kern.messages
   Kernel console message verbosity.
   See
   .Aq Pa sys/reboot.h
   .Bl -column "verbosity" "setting" -offset indent
   .It Sy Value Ta Sy Verbosity Ta Sy sys/reboot.h equivalent
   .It 0 Ta Silent Ta Sy AB_SILENT
   .It 1 Ta Quiet Ta Sy AB_QUIET
   .It 2 Ta Normal Ta Sy AB_NORMAL
   .It 3 Ta Verbose Ta Sy AB_VERBOSE
   .It 4 Ta Debug Ta Sy AB_DEBUG
   .El
   .It Li kern.module
   Settings related to kernel modules.
   The third level names for the settings are described below.
   .Bl -column "kern.module.autoload" "integer" "Changeable" -offset indent
   .It Sy Third level name Ta Sy Type Ta Sy Changeable
   .It kern.module.autoload        integer yes
   .It kern.module.autotime        integer yes
   .It kern.module.verbose boolean yes
   .El
   .Pp
   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
   .Xr module 7
   for additional details.
   .It Li kern.module.autotime
   An integer that controls the delay before an attempt is made to
   automatically unload a module that was auto-loaded.
   Setting this value to zero disables the auto-unload function.
   .It Li kern.module.verbose
   A boolean that enables or disables verbose
   debug messages related to kernel modules.
   .El
   .It Li kern.monotonic_clock ( Dv KERN_MONOTONIC_CLOCK )
   Returns the standard version the implementation of the
   .St -p1003.1b-93
 Monotonic Clock Option conforms to,  Monotonic Clock Option conforms to,
 otherwise 0.  otherwise\ 0.
 .It Li kern.msgbuf ( KERN_MSGBUF )  .It Li kern.mqueue
   Settings related to POSIX message queues; see
   .Xr mqueue 3 .
   This node is created dynamically when
   the corresponding kernel module is loaded.
   The third level names for the settings are described below.
   .Bl -column "kern.mqueue.mq_max_msgsize" "integer" "Changeable" -offset indent
   .It Sy Third level name Ta Sy Type Ta Sy Changeable
   .It kern.mqueue.mq_open_max     integer yes
   .It kern.mqueue.mq_prio_max     integer yes
   .It kern.mqueue.mq_max_msgsize  integer yes
   .It kern.mqueue.mq_def_maxmsg   integer yes
   .It kern.mqueue.mq_max_maxmsg   integer yes
   .El
   .Pp
   The variables are:
   .Bl -tag -width "123456"
   .It Li kern.mqueue.mq_open_max
   The maximum number of message queue descriptors any single process can open.
   .It Li kern.mqueue.mq_prio_max
   The maximum priority of a message.
   .It Li kern.mqueue.mq_max_msgsize
   The maximum size of a message in a message queue.
   .It Li kern.mqueue.mq_def_maxmsg
   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.msgbuf ( Dv KERN_MSGBUF )
 The kernel message buffer, rotated so that the head of the circular kernel  The kernel message buffer, rotated so that the head of the circular kernel
 message buffer is at the start of the returned data.  message buffer is at the start of the returned data.
 The returned data may contain NUL bytes.  The returned data may contain NUL bytes.
 .It Li kern.msgbufsize ( KERN_MSGBUFSIZE )  .It Li kern.msgbufsize ( Dv KERN_MSGBUFSIZE )
 The maximum number of characters that the kernel message buffer can hold.  The maximum number of characters that the kernel message buffer can hold.
 .It Li kern.ngroups ( KERN_NGROUPS )  .It Li kern.ngroups ( Dv KERN_NGROUPS )
 The maximum number of supplemental groups.  The maximum number of supplemental groups.
 .It Li kern.ntptime ( KERN_NTPTIME )  .\" .It Li kern.no_sa_support
   .\" XXX: Undocumented.
   .It Li kern.ntptime ( Dv KERN_NTPTIME )
 A  A
 .Va struct ntptimeval  .Vt struct ntptimeval
 structure is returned.  structure is returned.
 This structure contains data used by the  This structure contains data used by the
 .Xr ntpd 8  .Xr ntpd 8
 program.  program.
 .It Li kern.osrelease ( KERN_OSRELEASE )  .It Li kern.osrelease ( Dv KERN_OSRELEASE )
 The system release string.  The system release string.
 .It Li kern.osrevision ( KERN_OSREV )  .It Li kern.osrevision ( Dv KERN_OSREV )
 The system revision string.  The system revision string.
 .It Li kern.ostype ( KERN_OSTYPE )  .It Li kern.ostype ( Dv KERN_OSTYPE )
 The system type string.  The system type string.
 .It Li kern.pipe ( KERN_PIPE )  .\".It Li kern.panic_now
   .\" XXX: Undocumented.
   .It Li kern.pipe ( Dv KERN_PIPE )
 Pipe settings.  Pipe settings.
 The third level names for the  integer pipe settings is detailed below.  The third level names for the  integer pipe settings is detailed below.
 The changeable column shows whether a process with appropriate  The changeable column shows whether a process with appropriate
 privilege may change the value.  privilege may change the value.
 .Bl -column "kern.pipe.maxbigpipesXXX" "integerXXX" -offset indent  .Bl -column "kern.pipe.maxbigpipes" "integer" "Changeable" -offset indent
 .It Sy Third level name Type    Changeable  .It Sy Third level name Ta Sy Type Ta Sy Changeable
 .It kern.pipe.kvasiz    integer yes  .It kern.pipe.kvasiz    integer yes
 .It kern.pipe.maxbigpipes       integer yes  .It kern.pipe.maxbigpipes       integer yes
 .It kern.pipe.maxkvasz  integer yes  .It kern.pipe.maxkvasz  integer yes
Line 566  privilege may change the value.
Line 878  privilege may change the value.
 .Pp  .Pp
 The variables are as follows:  The variables are as follows:
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .It Li kern.pipe.kvasiz ( KERN_PIPE_KVASIZ )  .It Li kern.pipe.kvasiz ( Dv KERN_PIPE_KVASIZ )
 Amount of kernel memory consumed by pipe buffers.  Amount of kernel memory consumed by pipe buffers.
 .It Li kern.pipe.maxbigpipes ( KERN_PIPE_MAXBIGPIPES )  .It Li kern.pipe.maxbigpipes ( Dv KERN_PIPE_MAXBIGPIPES )
 Maximum number of "big" pipes.  Maximum number of
 .It Li kern.pipe.maxkvasz ( KERN_PIPE_MAXKVASZ )  .Dq big
   pipes.
   .It Li kern.pipe.maxkvasz ( Dv KERN_PIPE_MAXKVASZ )
 Maximum amount of kernel memory to be used for pipes.  Maximum amount of kernel memory to be used for pipes.
 .It Li kern.pipe.limitkva ( KERN_PIPE_LIMITKVA )  .It Li kern.pipe.limitkva ( Dv KERN_PIPE_LIMITKVA )
 Limit for direct transfers via page loan.  Limit for direct transfers via page loan.
 .It Li kern.pipe.nbigpipes ( KERN_PIPE_NBIGPIPES )  .It Li kern.pipe.nbigpipes ( Dv KERN_PIPE_NBIGPIPES )
 Number of "big" pipes.  Number of
 .El  .Dq big
 .It Li kern.posix1version ( KERN_POSIX1 )  pipes.
 The version of ISO/IEC 9945 (POSIX 1003.1) with which the system  .El
 attempts to comply.  .It Li kern.pool
 .It Li kern.posix_barriers ( KERN_POSIX_BARRIERS )  Provides statistics about the
   .Xr pool 9
   and
   .Xr pool_cache 9
   subsystems.
   .\" XXX: Undocumented .It Li kern.posix ( ? )
   .\"      This is a node in which the only variable is semmax.
   .It Li kern.posix1version ( Dv KERN_POSIX1 )
   The version of ISO/IEC 9945
   .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 ( Dv KERN_POSIX_BARRIERS )
 The version of  The version of
 .St -p1003.1  .St -p1003.1
 and its  and its
 Barriers  Barriers
 option to which the system attempts to conform,  option to which the system attempts to conform,
 otherwise 0.  otherwise\ 0.
 .It Li kern.posix_reader_writer_locks ( KERN_POSIX_READER_WRITER_LOCKS )  .It Li kern.posix_reader_writer_locks ( Dv KERN_POSIX_READER_WRITER_LOCKS )
 The version of  The version of
 .St -p1003.1  .St -p1003.1
 and its  and its
 Read-Write Locks  Read-Write Locks
 option to which the system attempts to conform,  option to which the system attempts to conform,
 otherwise 0.  otherwise\ 0.
 .It Li kern.posix_semaphores ( KERN_POSIX_SEMAPHORES )  .\".It Li kern.posix_sched
   .\" XXX: Undocumented.
   .It Li kern.posix_semaphores ( Dv KERN_POSIX_SEMAPHORES )
 The version of  The version of
 .St -p1003.1  .St -p1003.1
 and its  and its
 Semaphores  Semaphores
 option to which the system attempts to conform,  option to which the system attempts to conform,
 otherwise 0.  otherwise\ 0.
 .It Li kern.posix_spin_locks ( KERN_POSIX_SPIN_LOCKS )  .It Li kern.posix_spin_locks ( Dv KERN_POSIX_SPIN_LOCKS )
 The version of  The version of
 .St -p1003.1  .St -p1003.1
 and its  and its
 Spin Locks  Spin Locks
 option to which the system attempts to conform,  option to which the system attempts to conform,
 otherwise 0.  otherwise\ 0.
 .It Li kern.posix_threads ( KERN_POSIX_THREADS )  .It Li kern.posix_threads ( Dv KERN_POSIX_THREADS )
 The version of  The version of
 .St -p1003.1  .St -p1003.1
 and its  and its
 Threads  Threads
 option to which the system attempts to conform,  option to which the system attempts to conform,
 otherwise 0.  otherwise\ 0.
 .It Li kern.posix_timers ( KERN_POSIX_TIMERS )  .It Li kern.posix_timers ( Dv KERN_POSIX_TIMERS )
 The version of  The version of
 .St -p1003.1  .St -p1003.1
 and its  and its
 Timers  Timers
 option to which the system attempts to conform,  option to which the system attempts to conform,
 otherwise 0.  otherwise\ 0.
 .It Li kern.proc ( KERN_PROC )  .It Li kern.proc ( Dv KERN_PROC )
 Return the entire process table, or a subset of it.  Return the entire process table, or a subset of it.
 An array of  An array of
 .Va struct kinfo_proc  .Vt struct kinfo_proc
 structures is returned,  structures is returned,
 whose size depends on the current number of such objects in the system.  whose size depends on the current number of such objects in the system.
 The third and fourth level numeric names are as follows:  The third and fourth level numeric names are as follows:
 .Bl -column "Third level nameXXXXXX" "Fourth level is:XXXXXX" -offset indent  .Bl -column "KERN_PROC_SESSION" "Fourth level is:" -offset indent
 .It Sy Third level name Fourth level is:  .It Sy Third level name Ta Sy Fourth level is :
 .It KERN\_PROC\_ALL     None  .It KERN_PROC_ALL       None
 .It KERN\_PROC\_GID     A group ID  .It KERN_PROC_GID       A group ID
 .It KERN\_PROC\_PID     A process ID  .It KERN_PROC_PID       A process ID
 .It KERN\_PROC\_PGRP    A process group  .It KERN_PROC_PGRP      A process group
 .It KERN\_PROC\_RGID    A real group ID  .It KERN_PROC_RGID      A real group ID
 .It KERN\_PROC\_RUID    A real user ID  .It KERN_PROC_RUID      A real user ID
 .It KERN\_PROC\_SESSION A session ID  .It KERN_PROC_SESSION   A session ID
 .It KERN\_PROC\_TTY     A tty device  .It KERN_PROC_TTY       A tty device
 .It KERN\_PROC\_UID     A user ID  .It KERN_PROC_UID       A user ID
 .El  .El
 .It Li kern.proc2 ( KERN_PROC2 )  .It Li kern.proc2 ( Dv 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.  structures are returned.
 The fifth level name is the size of the  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.  and the sixth level name is the number of structures to return.
 .It Li kern.proc_args ( KERN_PROC_ARGS )  .It Li kern.proc_args ( Dv KERN_PROC_ARGS )
 Return the argv or environment strings (or the number thereof)  Return the argv or environment strings (or the number thereof)
 of a process.  of a process.
 Multiple strings are returned separated by NUL characters.  Multiple strings are returned separated by NUL characters.
 The third level name is the process ID.  The third level name is the process ID.
 The fourth level name is as follows:  The fourth level name is as follows:
 .Bl -column "Third level nameXXXXXX" -offset indent  .Bl -column "KERN_PROG_PATHNAME" "The full pathname of the executable" -offset indent
 .It KERN\_PROC\_ARGV    The argv strings  .It Dv KERN_PROC_ARGV   The argv strings
 .It KERN\_PROC\_ENV     The environ strings  .It Dv KERN_PROC_ENV    The environ strings
 .It KERN\_PROC\_NARGV   The number of argv strings  .It Dv KERN_PROC_NARGV  The number of argv strings
 .It KERN\_PROC\_NENV    The number of environ strings  .It Dv KERN_PROC_NENV   The number of environ strings
   .It Dv KERN_PROC_PATHNAME       The full pathname of the executable
 .El  .El
 .It Li kern.profiling ( KERN_PROF )  .It Li kern.profiling ( Dv KERN_PROF )
 Return profiling information about the kernel.  Return profiling information about the kernel.
 If the kernel is not compiled for profiling,  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 .  .Er EOPNOTSUPP .
 The third level names for the string and integer profiling information  The third level names for the string and integer profiling information
 is detailed below.  is detailed below.
 The changeable column shows whether a process with appropriate  The changeable column shows whether a process with appropriate
 privilege may change the value.  privilege may change the value.
 .Bl -column "kern.profiling.gmonparam" "struct gmonparam" -offset indent  .Bl -column "kern.profiling.gmonparam" "struct gmonparam" "Changeable" -offset indent
 .It Sy Third level name Type    Changeable  .It Sy Third level name Ta Sy Type Ta Sy Changeable
 .It kern.profiling.count        u_short[\|]     yes  .It kern.profiling.count        u_short[\|]     yes
 .It kern.profiling.froms        u_short[\|]     yes  .It kern.profiling.froms        u_short[\|]     yes
 .It kern.profiling.gmonparam    struct gmonparam        no  .It kern.profiling.gmonparam    struct gmonparam        no
Line 681  privilege may change the value.
Line 1016  privilege may change the value.
 .Pp  .Pp
 The variables are as follows:  The variables are as follows:
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .It Li kern.profiling.count ( GPROF_COUNT )  .It Li kern.profiling.count ( Dv GPROF_COUNT )
 Array of statistical program counter counts.  Array of statistical program counter counts.
 .It Li kern.profiling.froms ( GPROF_FROMS )  .It Li kern.profiling.froms ( Dv GPROF_FROMS )
 Array indexed by program counter of call-from points.  Array indexed by program counter of call-from points.
 .It Li kern.profiling.gmonparams ( GPROF_GMONPARAM )  .It Li kern.profiling.gmonparams ( Dv GPROF_GMONPARAM )
 Structure giving the sizes of the above arrays.  Structure giving the sizes of the above arrays.
 .It Li kern.profiling.state ( GPROF_STATE )  .It Li kern.profiling.state ( Dv GPROF_STATE )
 Profiling 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 ,
 .It Li kern.profiling.tos ( GPROF_TOS )  starts profiling.
   If set to
   .Dv GMON_PROF_OFF ,
   stops profiling.
   .It Li kern.profiling.tos ( Dv GPROF_TOS )
 Array of  Array of
 .Va struct tostruct  .Vt struct tostruct
 describing destination of calls and their counts.  describing destination of calls and their counts.
 .El  .El
 .It Li kern.rawpartition ( KERN_RAWPARTITION )  .\" .It Li kern.pset
   .\" XXX: Undocumented.
   .It Li kern.rawpartition ( Dv KERN_RAWPARTITION )
 The raw partition of a disk (a == 0).  The raw partition of a disk (a == 0).
 .It Li kern.root_device ( KERN_ROOT_DEVICE )  .It Li kern.root_device ( Dv KERN_ROOT_DEVICE )
 The name of the root device (e.g.,  The name of the root device (e.g.,
 .Dq wd0 ) .  .Dq wd0 ) .
 .It Li kern.root_partition ( KERN_ROOT_PARTITION )  .It Li kern.root_partition ( Dv KERN_ROOT_PARTITION )
 The root partition on the root device (a == 0).  The root partition on the root device (a == 0).
 .It Li kern.rtc_offset ( KERN_RTC_OFFSET )  .It Li kern.rtc_offset ( Dv KERN_RTC_OFFSET )
 Return the offset of real time clock from UTC in minutes.  Return the offset of real time clock from UTC in minutes.
 .It Li kern.saved_ids ( KERN_SAVED_IDS )  .It Li kern.saved_ids ( Dv KERN_SAVED_IDS )
 Returns 1 if saved set-group and saved set-user ID is available.  Returns 1 if saved set-group and saved set-user ID is available.
 .It Li kern.sbmax ( KERN_SBMAX )  .It Li kern.sbmax ( Dv KERN_SBMAX )
 Maximum socket buffer size.  Maximum socket buffer size.
 .\" XXX units?  .\" XXX units?
 .It Li kern.securelevel ( KERN_SECURELVL )  .It Li kern.securelevel ( Dv KERN_SECURELVL )
 The system security level.  See
 This level may be raised by processes with appropriate privilege.  .Xr secmodel_securelevel 9 .
 It may only be lowered by process 1.  .It Li kern.sched ( dynamic )
 .It Li kern.somaxkva ( KERN_SOMAXKVA )  Influence the scheduling of LWPs, their priorisation and how they are
 Maximum amount of kernel memory to be used for socket buffers.  distributed on and moved between CPUs.
 .\" XXX units?  .Bl -column "kern.sched.balance_period" "integer" "Changeable" -offset indent
 .It Li kern.synchronized_io ( KERN_SYNCHRONIZED_IO )  .It Sy Third level name    Sy Type       Sy Changeable
 Returns 1 if the POSIX 1003.1b Synchronized I/O Option is available  .It kern.sched.cacheht_time        integer       yes
 on this system,  .It kern.sched.balance_period      integer       yes
 otherwise 0.  .It kern.sched.average_weight      integer       yes
 .It Li kern.ipc ( KERN_SYSVIPC )  .It kern.sched.min_catch           integer       yes
 Return information about the SysV IPC parameters.  .It kern.sched.timesoftints        integer       yes
 The third level names for the ipc variables are detailed below.  .It kern.sched.kpreempt_pri        integer       yes
 .Bl -column "KERN_SYSVIPC_MSGXXX" "integerXXX" "noXXX" -offset indent  .It kern.sched.upreempt_pri        integer       yes
 .It Sy Third level name Type            Changeable  .It kern.sched.maxts       integer       yes
 .It kern.ipc.sysvmsg    integer         no  .It kern.sched.mints       integer       yes
 .It kern.ipc.sysvsem    integer         no  .It kern.sched.name        string        no
 .It kern.ipc.sysvshm    integer         no  .It kern.sched.rtts        integer       no
 .It kern.ipc.sysvipc_info       struct          no  .It kern.sched.pri_min     integer       no
 .It kern.ipc.shmmax     integer         yes  .It kern.sched.pri_max     integer       no
 .It kern.ipc.shmmni     integer         yes  
 .It kern.ipc.shmseg     integer         yes  
 .It kern.ipc.shmmaxpgs  integer         yes  
 .It kern.ipc.shm_use_phys       integer         yes  
 .It kern.ipc.msgmni     integer         yes  
 .It kern.ipc.msgseg     integer         yes  
 .It kern.ipc.semmni     integer         yes  
 .It kern.ipc.semmns     integer         yes  
 .It kern.ipc.semmnu     integer         yes  
 .El  .El
   .Pp
   The variables are as follows:
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .It Li kern.ipc.sysvmsg ( KERN_SYSVIPC_MSG )  .It Li kern.sched.cacheht_time ( dynamic )
 Returns 1 if System V style message queue functionality is available  Cache hotness time in which a LWP is kept on one particular CPU
 on this system,  and not moved to another CPU.
 otherwise 0.  This reduces the overhead of flushing and reloading caches.
 .It Li kern.ipc.sysvsem ( KERN_SYSVIPC_SEM )  Defaults to 3ms.
 Returns 1 if System V style semaphore functionality is available  Needs to be given in
 on this system,  .Dq hz
 otherwise 0.  units, see
 .It Li kern.ipc.sysvshm ( KERN_SYSVIPC_SHM )  .Xr mstohz 9 .
 Returns 1 if System V style share memory functionality is available  .It Li kern.sched.balance_period ( dynamic )
 on this system,  Interval at which the CPU queues are checked for re-balancing.
 otherwise 0.  Defaults to 300ms.
 .It Li kern.ipc.sysvipc_info ( KERN_SYSVIPC_INFO )  Needs to be given in
 Return System V style IPC configuration and run-time information.  .Dq hz
 The fourth level name selects the System V style IPC facility.  units, see
 .Bl -column "KERN_SYSVIPC_MSG_INFOXXX" "struct shm_sysctl_infoXXX" -offset indent  .Xr mstohz 9 .
 .It Sy Fourth level name        Type  .It Li kern.sched.average_weight ( dynamic )
 .It KERN\_SYSVIPC\_MSG\_INFO    struct msg_sysctl_info  Can be used to influence how likely LWPs are to be migrated from
 .It KERN\_SYSVIPC\_SEM\_INFO    struct sem_sysctl_info  one CPU's queue of LWPs that are ready to run to a different, idle CPU.
 .It KERN\_SYSVIPC\_SHM\_INFO    struct shm_sysctl_info  The value gives the percentage for weighting the average count of
   migratable threads from the past against the current number of
   migratable threads.
   A small value gives more weight to the past, a larger values more weight
   on the current situation.
   Defaults to 50 and must be between 0 and 100.
   .It Li kern.sched.min_catch ( dynamic )
   Minimum count of migratable (runable) threads for catching (stealing)
   from another CPU.
   Defaults to 1 but can be increased to decrease chance of thread
   migration between CPUs.
   .It Li kern.sched.timesoftints ( dynamic )
   Enable tracking of CPU time for soft interrupts
   as part of a LWP's real execution time.
   Set to a non-zero value to enable,
   and see
   .Xr ps 1
   for printing CPU times.
   .It Li kern.sched.kpreempt_pri ( dynamic )
   Minimum priority to trigger kernel preemption.
   .It Li kern.sched.upreempt_pri ( dynamic )
   Minimum priority to trigger user preemption.
   .It Li kern.sched.maxts ( dynamic )
   Scheduler specific maximal time quantum (in milliseconds).
   Must be set to a value larger than
   .Dq mints
   and between 10 and
   .Dq hz
   as given by the
   .Dv kern.clockrate
   sysctl.
   Provided by the M2 scheduler.
   .It Li kern.sched.mints ( dynamic )
   Scheduler specific minimal time quantum (in milliseconds).
   Must be set to a value smaller than
   .Dq maxts
   and between 1 and
   .Dq hz
   as given by the
   .Dq kern.clockrate
   sysctl.
   Provided by the M2 scheduler.
   .It Li kern.sched.name ( dynamic )
   Scheduler name.
   Provided both by the M2 and the 4BSD scheduler.
   .It Li kern.sched.rtts ( dynamic )
   Fixed scheduler specific round-robin time quantum in milliseconds.
   Provided both by the M2 and the 4BSD scheduler.
   .It Li kern.sched.pri_min ( dynamic )
   Minimal POSIX real-time priority.
   See
   .Xr sched 3 .
   .It Li kern.sched.pri_max ( dynamic )
   Maximal POSIX real-time priority.
   See
   .Xr sched 3 .
   .El
   .It Li kern.somaxkva ( Dv KERN_SOMAXKVA )
   Maximum amount of kernel memory to be used for socket buffers.
   .\" XXX units?
   .It Li kern.synchronized_io ( Dv KERN_SYNCHRONIZED_IO )
   Returns 1 if the
   .St -p1003.1b-93
   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
   .It Sy Third level name Ta Sy Type Ta Sy Changeable
   .It kern.timecounter.choice     string  no
   .It kern.timecounter.hardware   string  yes
   .It kern.timecounter.timestepwarnings   integer yes
 .El  .El
 .Pp  .Pp
   The variables are as follows:
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .It Li KERN_SYSVIPC_MSG_INFO  .It Li kern.timecounter.choice ( dynamic )
 Return information on the System V style message facility.  The list of available timecounters with their quality and frequency.
 The  .It Li kern.timecounter.hardware ( dynamic )
 .Sy msg_sysctl_info  The currently selected timecounter source.
 structure is defined in  .It Li kern.timecounter.timestepwarnings ( dynamic )
 .Aq Pa sys/msg.h .  If non-zero display a message each time the time is stepped.
 .It Li KERN_SYSVIPC_SEM_INFO  
 Return information on the System V style semaphore facility.  
 The  
 .Sy sem_sysctl_info  
 structure is defined in  
 .Aq Pa sys/sem.h .  
 .It Li KERN_SYSVIPC_SHM_INFO  
 Return information on the System V style shared memory facility.  
 The  
 .Sy shm_sysctl_info  
 structure is defined in  
 .Aq Pa sys/shm.h .  
 .El  .El
 .It Li kern.ipc.shmmax ( KERN_SYSVIPC_SHMMAX )  .It Li kern.timex ( Dv KERN_TIMEX )
 Max shared memory segment size in bytes.  
 .It Li kern.ipc.shmmni ( KERN_SYSVIPC_SHMMNI )  
 Max number of shared memory identifiers.  
 .It Li kern.ipc.shmseg ( KERN_SYSVIPC_SHMSEG )  
 Max shared memory segments per process.  
 .It Li kern.ipc.shmmaxpgs ( KERN_SYSVIPC_SHMMAXPGS )  
 Max amount of shared memory in pages.  
 .It Li kern.ipc.shm_use_phys ( KERN_SYSVIPC_SHMUSEPHYS )  
 Locking of shared memory in physical memory.  
 If 0, memory can be swapped  
 out, otherwise it will be locked in physical memory.  
 .It Li kern.ipc.msgmni  
 Max number of message queue identifiers.  
 .It Li kern.ipc.msgseg  
 Max number of number of message segments.  
 .It Li kern.ipc.semmni  
 Max number of number of semaphore identifiers.  
 .It Li kern.ipc.semmns  
 Max number of number of semaphores in system.  
 .It Li kern.ipc.semmnu  
 Max number of undo structures in system.  
 .El  
 .It Li kern.timex ( KERN_TIMEX )  
 Not available.  Not available.
 .It Li kern.tkstat ( KERN_TKSTAT )  .It Li kern.tkstat ( Dv KERN_TKSTAT )
 Return information about the number of characters sent and received  Return information about the number of characters sent and received
 on ttys.  on ttys.
 The third level names for the tty statistic variables are detailed below.  The third level names for the tty statistic variables are detailed below.
 The changeable column shows whether a process  The changeable column shows whether a process
 with appropriate privilege may change the value.  with appropriate privilege may change the value.
 .Bl -column "KERNXTKSTATXRAWCCXXX" "struct integerXXX" -offset indent  .Bl -column "kern.tkstat.cancc" "quad" "Changeable" -offset indent
 .It Sy Third level name Type    Changeable  .It Sy Third level name Ta Sy Type Ta Sy Changeable
 .It kern.tkstat.cancc   quad    no  .It kern.tkstat.cancc   quad    no
 .It kern.tkstat.nin     quad    no  .It kern.tkstat.nin     quad    no
 .It kern.tkstat.nout    quad    no  .It kern.tkstat.nout    quad    no
Line 825  with appropriate privilege may change th
Line 1196  with appropriate privilege may change th
 .Pp  .Pp
 The variables are as follows:  The variables are as follows:
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .It Li kern.tkstat.cancc ( KERN_TKSTAT_CANCC )  .It Li kern.tkstat.cancc ( Dv KERN_TKSTAT_CANCC )
 The number of canonical input characters.  The number of canonical input characters.
 .It Li kern.tkstat.nin ( KERN_TKSTAT_NIN )  .It Li kern.tkstat.nin ( Dv KERN_TKSTAT_NIN )
 The total number of input characters.  The total number of input characters.
 .It Li kern.tkstat.nout ( KERN_TKSTAT_NOUT )  .It Li kern.tkstat.nout ( Dv KERN_TKSTAT_NOUT )
 The total number of output characters.  The total number of output characters.
 .It Li kern.tkstat.rawcc ( KERN_TKSTAT_RAWCC )  .It Li kern.tkstat.rawcc ( Dv KERN_TKSTAT_RAWCC )
 The number of raw input characters.  The number of raw input characters.
 .El  .El
 .It Li kern.urandom ( KERN_URND )  .It Li kern.tty
   The third level names for the tty setup variables are detailed below.
   The changeable column shows whether a process
   with appropriate privilege may change the value.
   .Bl -column "kern.tty.qsize" "int" "Changeable" -offset indent
   .It Sy Third level name Ta Sy Type Ta Sy Changeable
   .It kern.tty.qsize      int     yes
   .El
   .Pp
   The variables are as follows:
   .Bl -tag -width "123456"
   .It Li kern.tty.qsize
   Control/display the size of the default input and output queues selected
   during tty creation.
   Is converted to a power of two and its range is between
   .Dv 1024
   and
   .Dv 65536 .
   .El
   .It Li kern.uidinfo
   Resource usage for the current user.
   .Bl -column "kern.uidinfo.proccnt" "integer" "Changeable" -offset indent
   .It Sy Third level name Ta Sy Type Ta Sy Changeable
   .It kern.uidinfo.proccnt        integer no
   .It kern.uidinfo.lwpcnt integer no
   .It kern.uidinfo.lockcnt        integer no
   .It kern.uidinfo.sbsize integer no
   .El
   .Bl -tag -width "123456"
   .It Li kern.uidinfo.proccnt
   Returns the number of active processes for the current user.
   .It Li kern.uidinfo.lwpcnt
   Returns the number of active threads for the current user; the first thread
   of each process is not counted.
   .It Li kern.uidinfo.lockcnt
   Number of locks held by the current user.
   .It Li kern.uidinfo.sbsize
   Number of bytes in socket buffers allocated to the current user.
   .El
   .It Li kern.urandom ( Dv KERN_URND )
 Random integer value.  Random integer value.
   .It Li kern.usercrypto
   When enabled, allows userland to
   .Xr open 2
   the
   .Pa /dev/crypto
   special device, used by the
   .Xr crypto 4
   system.
   .It Li kern.userasymcrypto
   Enables or disables the use of software asymmetric crypto support in the
   .Xr crypto 4
   system.
 .It Li kern.veriexec  .It Li kern.veriexec
 Tunings for Verixec.  Runtime information for
   .Xr veriexec 8 .
   .Bl -column "kern.veriexec.algorithms" "integer" "Changeable" -offset indent
   .It Sy Third level name Ta Sy Type Ta Sy Changeable
   .It kern.veriexec.algorithms    string  no
   .It kern.veriexec.count node    not applicable
   .It kern.veriexec.strict        integer yes
   .It kern.veriexec.verbose       integer yes
   .El
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .It Li kern.veriexec.algorithms  .It Li kern.veriexec.algorithms
 Returns a string with the supported algorithms in Veriexec.  Returns a string with the supported algorithms in Veriexec.
Line 847  Each mount will be under its own
Line 1277  Each mount will be under its own
 .No tableN  .No tableN
 node.  node.
 Under each node there will be three variables, indicating the mount  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  .It Li kern.veriexec.strict
 Controls the strict level of Veriexec.  Controls the strict level of Veriexec.
 See  See
 .Xr security 8  .Xr security 7
 for more information on each level's implications.  for more information on each level's implications.
 .It Li kern.veriexec.verbose  .It Li kern.veriexec.verbose
 Controls the verbosity level of Veriexec.  Controls the verbosity level of Veriexec.
Line 863  If 1, more messages will be printed (ie.
Line 1293  If 1, more messages will be printed (ie.
 fingerprint is accessed).  fingerprint is accessed).
 Verbose level 2 is debug mode.  Verbose level 2 is debug mode.
 .El  .El
 .It Li kern.version ( KERN_VERSION )  .It Li kern.version ( Dv KERN_VERSION )
 The system version string.  The system version string.
 .It Li kern.vnode ( KERN_VNODE )  .It Li kern.vnode ( Dv KERN_VNODE )
 Return the entire vnode table.  Return the entire vnode table.
 Note, the vnode table is not necessarily a consistent snapshot of  Note, the vnode table is not necessarily a consistent snapshot of
 the system.  the system.
 The returned data consists of an array whose size depends on the  The returned data consists of an array whose size depends on the
 current number of such objects in the system.  current number of such objects in the system.
 Each element of the array contains the kernel address of a vnode  Each element of the array contains the kernel address of a vnode
 .Va struct vnode *  .Vt struct vnode *
 followed by the vnode itself  followed by the vnode itself
 .Va struct vnode .  .Vt struct vnode .
 .It Li kern.coredump.setid  .\" XXX: Undocumented: kern.lwp: no children?
 Settings related to set-id processes coredumps.  
 By default, set-id processes do not dump core in situations where  
 other processes would.  
 The settings in this node allows an administrator to change this  
 behavior.  
 .Pp  
 .Bl -tag -width "123456"  
 .It Li kern.coredump.setid.dump  
 If non-zero, set-id processes will dump core.  
 .It Li kern.coredump.setid.group  
 The group-id for the set-id processes' coredump.  
 .It Li kern.coredump.setid.mode  
 The mode for the set-id processes' coredump.  
 See  
 .Xr chmod 1 .  
 .It Li kern.coredump.setid.owner  
 The user-id that will be used as the owner of the set-id processes'  
 coredump.  
 .It Li kern.coredump.setid.path  
 The path to which set-id processes' coredumps will be saved to.  
 Same syntax as kern.defcorename.  
 .El  .El
 .\" XXX kern.lwp  .Ss The machdep.* subtree
 .El  
 .Sh The machdep.* subtree  
 The set of variables defined is architecture dependent.  The set of variables defined is architecture dependent.
 Most architectures define at least the following variables.  Most architectures define at least the following variables.
 .Bl -column "CONSOLE_DEVICEXXX" "integerXXX" -offset indent  .Bl -column "machdep.booted_kernel" "Type" "Changeable" -offset indent
 .It Sy Second level name        Type    Changeable  .It Sy Second level name Ta Sy Type Ta Sy Changeable
 .It Li CPU_CONSDEV      dev_t   no  .It Li machdep.booted_kernel    string  no
 .El  .El
 .Sh The net.* subtree  .\" XXX: Document the above.
   .Ss The net.* subtree
 The string and integer information available for the  The string and integer information available for the
 .Li net  .Li net
 level is detailed below.  level is detailed below.
Line 915  The changeable column shows whether a pr
Line 1323  The changeable column shows whether a pr
 privilege may change the value.  privilege may change the value.
 The second and third levels are typically the protocol family and  The second and third levels are typically the protocol family and
 protocol number, though this is not always the case.  protocol number, though this is not always the case.
 .Bl -column "Second level nameX" "IPsec key management valuesX" -offset indent  .Bl -column "Second level name" "IPsec key management values" "Changeable" -offset indent
 .It Sy Second level name        Type    Changeable  .It Sy Second level name Ta Sy Type Ta Sy Changeable
 .It net.route   routing messages        no  .It net.route   routing messages        no
 .It net.inet    IPv4 values     yes  .It net.inet    IPv4 values     yes
 .It net.inet6   IPv6 values     yes  .It net.inet6   IPv6 values     yes
 .It net.key     IPsec key management values     yes  .It net.key     IPsec key management values     yes
 .El  .El
 .Pp  
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .It Li net.route ( PF_ROUTE )  .It Li net.route ( Dv PF_ROUTE )
 .\" XXX really?  .\" XXX really?
 Return the entire routing table or a subset of it.  Return the entire routing table or a subset of it.
 The data is returned as a sequence of routing messages (see  The data is returned as a sequence of routing messages (see
Line 932  The data is returned as a sequence of ro
Line 1339  The data is returned as a sequence of ro
 for the header file, format and meaning).  for the header file, format and meaning).
 The length of each message is contained in the message header.  The length of each message is contained in the message header.
 .Pp  .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  The fourth level name is an address family, which may be set to 0 to
 select all address families.  select all address families.
 The fifth and sixth level names are as follows:  The fifth and sixth level names are as follows:
 .Bl -column "Fifth level nameXXXXXX" "Sixth level is:XXX" -offset indent  .Bl -column "Fifth level name" "Sixth level is:" -offset indent
 .It Sy Fifth level name Sixth level is:  .It Sy Fifth level name Ta Sy Sixth level is :
 .It NET\_RT\_FLAGS      rtflags  .It NET_RT_FLAGS        rtflags
 .It NET\_RT\_DUMP       None  .It NET_RT_DUMP None
 .It NET\_RT\_IFLIST     None  .It NET_RT_IFLIST       None
 .El  .El
 .It Li net.inet ( PF_INET )  .It Li net.inet ( Dv PF_INET )
 Get or set various global information about the IPv4  Get or set various global information about the IPv4
 .Pq Internet Protocol version 4 .  .Pq Internet Protocol version 4 .
 The third level name is the protocol.  The third level name is the protocol.
 The fourth level name is the variable name.  The fourth level name is the variable name.
 The currently defined protocols and names are:  The currently defined protocols and names are:
 .Bl -column "Protocol name" "sack.globalmaxholes" "integer" -offset 4n  .Bl -column "Protocol" "anonportalgo.available" "integer" "Changeable" -offset indent
 .It Sy Protocol name    Variable name   Type    Changeable  .It Sy Protocol Variable Ta Sy Type Ta Sy Changeable
 .It arp down    integer yes  .It arp down    integer yes
 .It arp keep    integer yes  .It arp keep    integer yes
 .It arp prune   integer yes  .It arp log_movements   integer yes
 .It arp refresh integer yes  .It arp log_permanent_modify    integer yes
   .It arp log_unknown_network     integer yes
   .It arp log_wrong_iface integer yes
 .It carp        allow   integer yes  .It carp        allow   integer yes
 .It carp        preempt integer yes  .It carp        preempt integer yes
 .It carp        log     integer yes  .It carp        log     integer yes
Line 962  The currently defined protocols and name
Line 1371  The currently defined protocols and name
 .It icmp        maskrepl        integer yes  .It icmp        maskrepl        integer yes
 .It icmp        rediraccept     integer yes  .It icmp        rediraccept     integer yes
 .It icmp        redirtimeout    integer yes  .It icmp        redirtimeout    integer yes
   .It icmp        bmcastecho      integer yes
 .It ip  allowsrcrt      integer yes  .It ip  allowsrcrt      integer yes
   .It ip  anonportalgo.selected   string  yes
   .It ip  anonportalgo.available  string  yes
   .It ip  anonportalgo.reserve    struct  yes
 .It ip  anonportmax     integer yes  .It ip  anonportmax     integer yes
 .It ip  anonportmin     integer yes  .It ip  anonportmin     integer yes
 .It ip  checkinterface  integer yes  .It ip  checkinterface  integer yes
   .It ip  dad_count       integer yes
 .It ip  directed-broadcast      integer yes  .It ip  directed-broadcast      integer yes
 .It ip  do_loopback_cksum       integer yes  .It ip  do_loopback_cksum       integer yes
 .It ip  forwarding      integer yes  .It ip  forwarding      integer yes
Line 996  The currently defined protocols and name
Line 1410  The currently defined protocols and name
 .It tcp mss_ifmtu       integer yes  .It tcp mss_ifmtu       integer yes
 .It tcp win_scale       integer yes  .It tcp win_scale       integer yes
 .It tcp timestamps      integer yes  .It tcp timestamps      integer yes
 .It tcp compat_42       integer yes  
 .It tcp cwm     integer yes  .It tcp cwm     integer yes
 .It tcp cwm_burstsize   integer yes  .It tcp cwm_burstsize   integer yes
 .It tcp ack_on_push     integer yes  .It tcp ack_on_push     integer yes
Line 1031  The variables are as follows:
Line 1444  The variables are as follows:
 Failed ARP entry lifetime.  Failed ARP entry lifetime.
 .It Li arp.keep  .It Li arp.keep
 Valid ARP entry lifetime.  Valid ARP entry lifetime.
 .It Li arp.prune  
 ARP cache pruning interval.  
 .It Li arp.refresh  
 ARP entry refresh interval.  
 .It Li carp.allow  .It Li carp.allow
 If set to 0, incoming  If set to 0, incoming
 .Xr carp 4  .Xr carp 4
Line 1065  believes it can send advertisements more
Line 1474  believes it can send advertisements more
 Disabled by default.  Disabled by default.
 .It Li ip.allowsrcrt  .It Li ip.allowsrcrt
 If set to 1, the host accepts source routed packets.  If set to 1, the host accepts source routed packets.
   .It Li ip.anonportalgo.available
   The available RFC 6056 port randomization algorithms.
   .It Li ip.anonportalgo.reserve
   A bitmask of ports that will not be used during anonymous or privileged
   port selection.
   .It Li ip.anonportalgo.selected
   The currently selected RFC 6056 port randomization algorithm.
 .It Li ip.anonportmax  .It Li ip.anonportmax
 The highest port number to use for TCP and UDP ephemeral port allocation.  The highest port number to use for TCP and UDP ephemeral port allocation.
 This cannot be set to less than 1024 or greater than 65535, and must  This cannot be set to less than 1024 or greater than 65535, and must
Line 1076  This cannot be set to less than 1024 or 
Line 1492  This cannot be set to less than 1024 or 
 .It Li ip.checkinterface  .It Li ip.checkinterface
 If set to non-zero, the host will reject packets addressed to it  If set to non-zero, the host will reject packets addressed to it
 that arrive on an interface not bound to that address.  that arrive on an interface not bound to that address.
 Currently, this must be disabled if ipnat is used to translate the  Currently, this must be disabled if NAT is used to translate the
 destination address to another local interface, or if addresses  destination address to another local interface, or if addresses
 are added to the loopback interface instead of the interface where  are added to the loopback interface instead of the interface where
 the packets for those packets are received.  the packets for those packets are received.
   .It Li ip.dad_count
   The number of
   .Xr arp 4
   probes sent for Address Conflict Detection.
   Set to 0 to disable this.
 .It Li ip.directed-broadcast  .It Li ip.directed-broadcast
 If set to 1, enables directed broadcast behavior for the host.  If set to 1, enables directed broadcast behavior for the host.
 .It Li ip.do_loopback_cksum  .It Li ip.do_loopback_cksum
Line 1171  ICMP redirect.
Line 1592  ICMP redirect.
 This defaults to 600 seconds.  This defaults to 600 seconds.
 .It Li icmp.returndatabytes  .It Li icmp.returndatabytes
 Number of bytes to return in an ICMP error message.  Number of bytes to return in an ICMP error message.
   .It Li icmp.bmcastecho
   If set to 1, enables responding to ICMP echo or timestamp request to the
   broadcast address.
 .It Li tcp.ack_on_push  .It Li tcp.ack_on_push
 If set to 1, TCP is to immediately transmit an ACK upon reception of  If set to 1, TCP is to immediately transmit an ACK upon reception of
 a packet with PUSH set.  a packet with PUSH set.
Line 1178  This can avoid losing a round trip time 
Line 1602  This can avoid losing a round trip time 
 but has the caveat of potentially defeating TCP's delayed ACK algorithm.  but has the caveat of potentially defeating TCP's delayed ACK algorithm.
 Use of this option is generally not recommended, but  Use of this option is generally not recommended, but
 the variable exists in case your configuration really needs it.  the variable exists in case your configuration really needs it.
 .It Li tcp.compat_42  
 If set to 1, enables work-arounds for bugs in the 4.2BSD TCP implementation.  
 Use of this option is not recommended, although it may be  
 required in order to communicate with extremely old TCP implementations.  
 .It Li tcp.cwm  .It Li tcp.cwm
 If set to 1, enables use of the Hughes/Touch/Heidemann Congestion Window  If set to 1, enables use of the Hughes/Touch/Heidemann Congestion Window
 Monitoring algorithm.  Monitoring algorithm.
Line 1199  Number of ticks to delay sending an ACK.
Line 1619  Number of ticks to delay sending an ACK.
 Perform TCP checksum on loopback.  Perform TCP checksum on loopback.
 .It Li tcp.init_win  .It Li tcp.init_win
 A value indicating the TCP initial congestion window.  A value indicating the TCP initial congestion window.
 If this value is 0, an auto-tuning algorithm designed to use an initial  The valid range
 window of approximately 4K bytes is in use.  is 0 to 10 (maximum specified by RFC6928),
 Otherwise, this value indicates a fixed number of packets.  with a default of 4 (approximately 4K per RFC3390).
 .It Li tcp.init_win_local  .It Li tcp.init_win_local
 Like  Like
 .Li tcp.init_win ,  .Li tcp.init_win ,
Line 1298  It has no effect unless tcp.abc.enable i
Line 1718  It has no effect unless tcp.abc.enable i
 If set to 1, UDP checksums are being computed.  If set to 1, UDP checksums are being computed.
 Received non-zero UDP checksums are always checked.  Received non-zero UDP checksums are always checked.
 Disabling UDP checksums is strongly discouraged.  Disabling UDP checksums is strongly discouraged.
 .It Li udp.sendspace  
 The default UDP send buffer size.  
 .It Li udp.recvspace  .It Li udp.recvspace
 The default UDP receive buffer size.  The default UDP receive buffer size.
   .It Li udp.sendspace
   The default UDP send buffer size.
 .El  .El
 .Pp  .Pp
 For variables net.*.ipsec, please refer to  For variables net.*.ipsec, please refer to
 .Xr ipsec 4 .  .Xr ipsec 4 .
 .It Li net.inet6 ( PF_INET6 )  .It Li net.inet6 ( Dv PF_INET6 )
 Get or set various global information about the IPv6  Get or set various global information about the IPv6
 .Pq Internet Protocol version 6 .  .Pq Internet Protocol version 6 .
 The third level name is the protocol.  The third level name is the protocol.
 The fourth level name is the variable name.  The fourth level name is the variable name.
 The currently defined protocols and names are:  The currently defined protocols and names are:
 .Bl -column "Protocol name" "Variable nameXX" "integer" "yes" -offset indent  .Bl -column "Protocol" "anonportalgo.available" "integer" "Changeable" -offset indent
 .It Sy Protocol name    Variable name   Type    Changeable  .It Sy Protocol Variable Ta Sy Type Ta Sy Changeable
 .It icmp6       errppslimit     integer yes  .It icmp6       errppslimit     integer yes
 .It icmp6       mtudisc_hiwat   integer yes  .It icmp6       mtudisc_hiwat   integer yes
 .It icmp6       mtudisc_lowat   integer yes  .It icmp6       mtudisc_lowat   integer yes
Line 1328  The currently defined protocols and name
Line 1748  The currently defined protocols and name
 .It icmp6       rediraccept     integer yes  .It icmp6       rediraccept     integer yes
 .It icmp6       redirtimeout    integer yes  .It icmp6       redirtimeout    integer yes
 .It ip6 accept_rtadv    integer yes  .It ip6 accept_rtadv    integer yes
   .It ip6 addctlpolicy    struct in6_addrpolicy   no
   .It ip6 anonportalgo.selected   string  yes
   .It ip6 anonportalgo.available  string  yes
   .It ip6 anonportalgo.reserve    struct  yes
 .It ip6 anonportmax     integer yes  .It ip6 anonportmax     integer yes
 .It ip6 anonportmin     integer yes  .It ip6 anonportmin     integer yes
 .It ip6 auto_flowlabel  integer yes  .It ip6 auto_flowlabel  integer yes
Line 1343  The currently defined protocols and name
Line 1767  The currently defined protocols and name
 .It ip6 log_interval    integer yes  .It ip6 log_interval    integer yes
 .It ip6 lowportmax      integer yes  .It ip6 lowportmax      integer yes
 .It ip6 lowportmin      integer yes  .It ip6 lowportmin      integer yes
   .It ip6 maxdynroutes    integer yes
   .It ip6 maxifprefixes   integer yes
   .It ip6 maxifdefrouters integer yes
 .It ip6 maxflows        integer yes  .It ip6 maxflows        integer yes
 .It ip6 maxfragpackets  integer yes  .It ip6 maxfragpackets  integer yes
 .It ip6 maxfrags        integer yes  .It ip6 maxfrags        integer yes
   .It ip6 neighborgcthresh        integer yes
 .It ip6 redirect        integer yes  .It ip6 redirect        integer yes
 .It ip6 rr_prune        integer yes  .It ip6 rr_prune        integer yes
 .It ip6 use_deprecated  integer yes  .It ip6 use_deprecated  integer yes
Line 1363  and autoconfigures address prefixes and 
Line 1791  and autoconfigures address prefixes and 
 The node must be a host  The node must be a host
 .Pq not a router  .Pq not a router
 for the option to be meaningful.  for the option to be meaningful.
   .It Li ip6.anonportalgo.available
   The available RFC 6056 port randomization algorithms.
   .It Li ip6.anonportalgo.reserve
   A bitmask of ports that will not be used during anonymous or privileged
   port selection.
   .It Li ip6.anonportalgo.selected
   The currently selected RFC 6056 port randomization algorithm.
 .It Li ip6.anonportmax  .It Li ip6.anonportmax
 The highest port number to use for TCP and UDP ephemeral port allocation.  The highest port number to use for TCP and UDP ephemeral port allocation.
 This cannot be set to less than 1024 or greater than 65535, and must  This cannot be set to less than 1024 or greater than 65535, and must
Line 1406  The number of IPv6 extension headers per
Line 1841  The number of IPv6 extension headers per
 If set to 0, the node will accept as many extension headers as possible.  If set to 0, the node will accept as many extension headers as possible.
 .It Li ip6.hashsize  .It Li ip6.hashsize
 The size of IPv6 Fast Forward hash table.  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.  A larger hash table size results in fewer collisions.
 Also see  Also see
 .Li ip6.maxflows .  .Li ip6.maxflows .
Line 1440  The lowest port number to use for TCP an
Line 1875  The lowest port number to use for TCP an
 This cannot be set to less than 0 or greater than 1024, and must  This cannot be set to less than 0 or greater than 1024, and must
 be smaller than  be smaller than
 .Li ip6.lowportmax .  .Li ip6.lowportmax .
   .It Li ip6.maxdynroutes
   Maximum number of routes created by redirect.
   Set it to negative to disable.
   The default value is 4096.
   .It Li ip6.maxifprefixes
   Maximum number of prefixes created by route advertisements per interface.
   Set it to negative to disable.
   The default value is 16.
   .It Li ip6.maxifdefrouters 16
   Maximum number of default routers created by route advertisements per interface.
   Set it to negative to disable.
   The default value is 16.
 .It Li ip6.maxflows  .It Li ip6.maxflows
 IPv6 Fast Forwarding is enabled by default.  IPv6 Fast Forwarding is enabled by default.
 If set to 0, IPv6 Fast Forwarding is disabled.  If set to 0, IPv6 Fast Forwarding is disabled.
Line 1456  The maximum number of fragments the node
Line 1903  The maximum number of fragments the node
 0 means that the node will not accept any fragments.  0 means that the node will not accept any fragments.
 \-1 means that the node will accept as many fragments as it receives.  \-1 means that the node will accept as many fragments as it receives.
 The flag is provided basically for avoiding possible DoS attacks.  The flag is provided basically for avoiding possible DoS attacks.
   .It Li ip6.neighborgcthresh
   Maximum number of entries in neighbor cache per interface.
   Set to negative to disable.
   The default value is 2048.
 .It Li ip6.redirect  .It Li ip6.redirect
 If set to 1, ICMPv6 redirects may be sent by the node.  If set to 1, ICMPv6 redirects may be sent by the node.
 This option is ignored unless the node is routing IP packets,  This option is ignored unless the node is routing IP packets,
Line 1563  Default UDP receive buffer size.
Line 2014  Default UDP receive buffer size.
 Default UDP send buffer size.  Default UDP send buffer size.
 .El  .El
 .Pp  .Pp
 We reuse net.*.tcp for  We reuse net.*.tcp for TCP over IPv6,
 .Tn TCP  
 over  
 .Tn IPv6 ,  
 and therefore we do not have variables net.*.tcp6.  and therefore we do not have variables net.*.tcp6.
 Variables net.inet6.udp6 have identical meaning to net.inet.udp.  Variables net.inet6.udp6 have identical meaning to net.inet.udp.
 Please refer to  Please refer to
Line 1574  Please refer to
Line 2022  Please refer to
 section above.  section above.
 For variables net.*.ipsec6, please refer to  For variables net.*.ipsec6, please refer to
 .Xr ipsec 4 .  .Xr ipsec 4 .
 .It Li net.key ( PF_KEY )  .It Li net.key ( Dv PF_KEY )
 Get or set various global information about the IPsec key management.  Get or set various global information about the IPsec key management.
 The third level name is the variable name.  The third level name is the variable name.
 The currently defined variable and names are:  The currently defined variable and names are:
 .Bl -column "blockacq_lifetime" "integer" "yes" -offset indent  .Bl -column "blockacq_lifetime" "integer" "Changeable" -offset indent
 .It Sy Variable name    Type    Changeable  .It Sy Variable Type Ta Sy Changeable
 .It debug       integer yes  .It debug       integer yes
   .It enabled     integer yes
   .It used        integer no
 .It spi_try     integer yes  .It spi_try     integer yes
 .It spi_min_value       integer yes  .It spi_min_value       integer yes
 .It spi_max_value       integer yes  .It spi_max_value       integer yes
Line 1596  The variables are as follows:
Line 2046  The variables are as follows:
 .It Li debug  .It Li debug
 Turn on debugging message from within the kernel.  Turn on debugging message from within the kernel.
 The value is a bitmap, as defined in  The value is a bitmap, as defined in
 .Pa /usr/include/netkey/key_debug.h .  .In netipsec/key_debug.h .
   .It Li enabled
   Control processing of IPsec control messages.
   .Bl -tag -width indent
   .It 0
   Never allow IPsec processing
   .It 1
   Allow IPsec processing when SPD policies are present.
   .It 2
   Force IPsec processing even when SPD policies are not present.
   .El
   .It Li used
   Based on if IPsec is enabled, and SPD rule existence, show if
   IPsec is being used.
   Note that currently once IPsec is being used, it cannot be disabled.
 .It Li spi_try  .It Li spi_try
 The number of times the kernel will try to obtain an unique SPI  The number of times the kernel will try to obtain an unique SPI
 when it generates it from random number generator.  when it generates it from random number generator.
Line 1626  Minimum AH key length, in bits,
Line 2090  Minimum AH key length, in bits,
 The value is used when the kernel creates proposal payload  The value is used when the kernel creates proposal payload
 on ACQUIRE PF_KEY message.  on ACQUIRE PF_KEY message.
 .El  .El
   .It Li net.local ( Dv PF_LOCAL )
   Get or set various global information about
   .Dv AF_LOCAL
   type sockets.
   For some variables, the third level name is the variable name:
   .Bl -column "Variable" "integer" "Changeable" -offset indent
   .It Sy Variable Type Ta Sy Changeable
   .It inflight    integer no
   .It deferred    integer no
   .El
   The variables are as follows:
   .Bl -tag -width "123456"
   .It Li inflight
   The number of file descriptors currently passed between processes,
   .Qq in flight .
   .It Li deferred
   The number of file descriptors passed between processes that have been
   deferred for cleanup by a kernel task.
   .El
   .Pp
   Other variables are specific to a socket type:
   .Bl -column "seqpacket" "sendspace" "integer" "Changeable" -offset indent
   .It Sy "Socket Type"    Sy Variable     Type Ta Sy Changeable
   .It dgram       pcblist struct  no
   .It dgram       recvspace       integer yes
   .It dgram       sendspace       integer yes
   .It seqpacket   pcblist struct  no
   .It stream      pcblist struct  no
   .It stream      recvspace       integer yes
   .It stream      sendspace       integer yes
   .El
   The variables are as follows:
   .Bl -tag -width "123456"
   .It Li dgram.pcblist
   The Protocol Control Block list structure for datagram sockets.
   Parsed by
   .Xr netstat 8
   or
   .Xr sockstat 8 .
   .It Li dgram.recvspace
   The default datagram receive buffer size.
   .It Li dgram.sendspace
   The default datagram send buffer size.
   .It Li seqpacket.pcblist
   The Protocol Control Block list structure for Sequential Packet sockets.
   Parsed by
   .Xr netstat 8
   or
   .Xr sockstat 8 .
   .It Li stream.pcblist
   The Protocol Control Block list structure for stream sockets.
   Parsed by
   .Xr netstat 8
   or
   .Xr sockstat 8 .
   .It Li stream.recvspace
   The default stream receive buffer size.
   .It Li stream.sendspace
   The default stream send buffer size.
   .El
 .El  .El
 .Sh The proc.* subtree  .Ss The proc.* subtree
 The string and integer information available for the  The string and integer information available for the
 .Li proc  .Li proc
 level is detailed below.  level is detailed below.
Line 1641  When a set-user-ID or set-group-ID binar
Line 2165  When a set-user-ID or set-group-ID binar
 value of PROC_PID_CORENAME is reset to the system default value.  value of PROC_PID_CORENAME is reset to the system default value.
 The second level name is either the magic value PROC_CURPROC, which  The second level name is either the magic value PROC_CURPROC, which
 points to the current process, or the PID of the target process.  points to the current process, or the PID of the target process.
 .Bl -column "USER_COLL_WEIGHTS_MAXXXX" "integerXXX" "yes" -offset indent  .Bl -column "proc.pid.corename" "string" "not applicable" -offset indent
 .It Sy Third level name Type    Changeable  .It Sy Third level name Ta Sy Type Ta Sy Changeable
 .It proc.pid.corename   string  yes  .It proc.pid.corename   string  yes
 .It proc.pid.rlimit     node    not applicable  .It proc.pid.rlimit     node    not applicable
 .It proc.pid.stopfork   int     yes  .It proc.pid.stopfork   int     yes
 .It proc.pid.stopexec   int     yes  .It proc.pid.stopexec   int     yes
 .It proc.pid.stopexit   int     yes  .It proc.pid.stopexit   int     yes
   .It proc.pid.paxflags   int     no
 .El  .El
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .Pp  .It Li proc.pid.corename ( Dv PROC_PID_CORENAME )
 .It Li proc.pid.corename ( PROC_PID_CORENAME )  
 The template used for the core dump file name (see  The template used for the core dump file name (see
 .Xr core 5  .Xr core 5
 for details).  for details).
 The base name must either be  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
 .It Li proc.pid.rlimit ( PROC_PID_LIMIT )  (the super-user may set arbitrary names).
   By default it points to
   .Dv KERN_DEFCORENAME .
   .It Li proc.pid.rlimit ( Dv PROC_PID_LIMIT )
 Return resources limits, as defined for the  Return resources limits, as defined for the
 .Xr getrlimit 2  .Xr getrlimit 2
 and  and
 .Xr setrlimit 2  .Xr setrlimit 2
 system calls.  system calls.
 The fourth level name is one of:  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 )  .It Li proc.pid.rlimit.cputime ( Dv PROC_PID_LIMIT_CPU )
 The maximum amount of CPU time (in seconds) to be used by each process.  The maximum amount of CPU time (in seconds) to be used by each process.
 .It Li proc.pid.rlimit.filesize ( PROC_PID_LIMIT_FSIZE )  .It Li proc.pid.rlimit.filesize ( Dv PROC_PID_LIMIT_FSIZE )
 The largest size (in bytes) file that may be created.  The largest size (in bytes) file that may be created.
 .It Li proc.pid.rlimit.datasize ( PROC_PID_LIMIT_DATA )  .It Li proc.pid.rlimit.datasize ( Dv PROC_PID_LIMIT_DATA )
 The maximum size (in bytes) of the data segment for a process;  The maximum size (in bytes) of the data segment for a process;
 this defines how far a program may extend its break with the  this defines how far a program may extend its break with the
 .Xr sbrk 2  .Xr sbrk 2
 system call.  system call.
 .It Li proc.pid.rlimit.stacksize ( PROC_PID_LIMIT_STACK )  .It Li proc.pid.rlimit.stacksize ( Dv PROC_PID_LIMIT_STACK )
 The maximum size (in bytes) of the stack segment for a process;  The maximum size (in bytes) of the stack segment for a process;
 this defines how far a program's stack segment may be extended.  this defines how far a program's stack segment may be extended.
 Stack extension is performed automatically by the system.  Stack extension is performed automatically by the system.
 .It Li proc.pid.rlimit.coredumpsize ( PROC_PID_LIMIT_CORE )  .It Li proc.pid.rlimit.coredumpsize ( Dv PROC_PID_LIMIT_CORE )
 The largest size (in bytes)  The largest size (in bytes)
 .Pa core  .Pa core
 file that may be created.  file that may be created.
 .It Li proc.pid.rlimit.memoryuse ( PROC_PID_LIMIT_RSS )  .It Li proc.pid.rlimit.memoryuse ( Dv PROC_PID_LIMIT_RSS )
 The maximum size (in bytes) to which a process's resident set size may  The maximum size (in bytes) to which a process's resident set size may
 grow.  grow.
 This imposes a limit on the amount of physical memory to be given to  This imposes a limit on the amount of physical memory to be given to
 a process; if memory is tight, the system will prefer to take memory  a process; if memory is tight, the system will prefer to take memory
 from processes that are exceeding their declared resident set size.  from processes that are exceeding their declared resident set size.
 .It Li proc.pid.rlimit.memorylocked ( PROC_PID_LIMIT_MEMLOCK )  .It Li proc.pid.rlimit.memorylocked ( Dv PROC_PID_LIMIT_MEMLOCK )
 The maximum size (in bytes) which a process may lock into memory  The maximum size (in bytes) which a process may lock into memory
 using the  using the
 .Xr mlock 2  .Xr mlock 2
 function.  function.
 .It Li proc.pid.rlimit.maxproc ( PROC_PID_LIMIT_NPROC )  .It Li proc.pid.rlimit.maxproc ( Dv PROC_PID_LIMIT_NPROC )
 The maximum number of simultaneous processes for this user id.  The maximum number of simultaneous processes for this user id.
 .It Li proc.pid.rlimit.descriptors ( PROC_PID_LIMIT_NOFILE )  .It Li proc.pid.rlimit.descriptors ( Dv PROC_PID_LIMIT_NOFILE )
 The maximum number of open files for this process.  The maximum number of open files for this process.
 .\" XXX proc.pid.rlimit.sbsize  .It Li proc.pid.rlimit.sbsize ( Dv PROC_PID_LIMIT_SBSIZE )
   The maximum size (in bytes) of the socket buffers
   set by the
   .Xr setsockopt 2
   .Dv SO_RCVBUF
   and
   .Dv SO_SNDBUF
   options.
   .It Li proc.pid.rlimit.vmemoryuse ( Dv PROC_PID_LIMIT_AS )
   The maximum size (in bytes) which a process can obtain.
   .It Li proc.pid.rlimit.maxlwp ( Dv PROC_PID_LIMIT_NTHR )
   The maximum number of threads that cen be created and running at one time in
   the process.
   The first thread of each process is not counted against this.
 .El  .El
 .Pp  .Pp
 The fifth level name is one of  The fifth level name is one of
 .Li soft ( PROC_PID_LIMIT_TYPE_SOFT ) or  .Li soft ( Dv PROC_PID_LIMIT_TYPE_SOFT )
 .Li hard ( PROC_PID_LIMIT_TYPE_HARD ) ,  or
   .Li hard ( Dv PROC_PID_LIMIT_TYPE_HARD ) ,
 to select respectively the soft or hard limit.  to select respectively the soft or hard limit.
 Both are of type integer.  Both are of type integer.
 .It Li proc.pid.stopfork ( PROC_PID_STOPFORK )  .It Li proc.pid.stopfork ( Dv PROC_PID_STOPFORK )
 If non zero, the process' children will be stopped after  If non zero, the process' children will be stopped after
 .Xr fork 2  .Xr fork 2
 calls.  calls.
 The children is created in the SSTOP state and is never scheduled  The children are created in the SSTOP state and are never scheduled
 for running before being stopped.  for running before being stopped.
 This feature helps attaching a process with a debugger such as  This feature enables attaching to a process with a debugger such as
 .Xr gdb 1  .Xr gdb 1
 before it had the opportunity to actually do anything.  before the process has the opportunity to actually do anything.
 .Pp  .Pp
 This value is inherited by the process's children, and it also  This value is inherited by the process's children, and it also
 apply to emulation specific system calls that fork a new process, such as  applies to emulation specific system calls that fork a new process, such as
 .Fn sproc  .Fn sproc
 or  or
 .Fn clone .  .Fn clone .
 .It Li proc.pid.stopexec ( PROC_PID_STOPEXEC )  .It Li proc.pid.stopexec ( Dv PROC_PID_STOPEXEC )
 If non zero, the process will be stopped on next  If non zero, the process will be stopped on the next
 .Xr exec 3  .Xr exec 3
 call.  call.
 The process created by  The process created by
 .Xr exec 3  .Xr exec 3
 is created in the SSTOP state and is never scheduled for running  is created in the SSTOP state and is never scheduled for running
 before being stopped.  before being stopped.
 This feature helps attaching a process with a debugger such as  This feature enables attaching to a process with a debugger such as
 .Xr gdb 1  .Xr gdb 1
 before it had the opportunity to actually do anything.  before the process has the opportunity to actually do anything.
 .Pp  .Pp
 This value is inherited by the process's children.  This value is inherited by the process's children.
 .It Li proc.pid.stopexit ( PROC_PID_STOPEXIT )  .It Li proc.pid.stopexit ( Dv PROC_PID_STOPEXIT )
 If non zero, the process will be stopped on when it has cause to exit,  If non zero, the process will be stopped when it has cause to exit,
 either by way of calling  either by way of calling
 .Xr exit 3 ,  .Xr exit 3 ,
 .Xr _exit 2 ,  .Xr _exit 2 ,
 or by the receipt of a specific signal.  or by the receipt of a specific signal.
 The process is stopped before any of its resources or vm space is  The process is stopped before any of its resources or vm space is
 released allowing examination of the termination state of a process  released allowing examination of the termination state of the process
 before it disappears.  before it disappears.
 This feature can be used to examine the final conditions of the  This feature can be used to examine the final conditions of the
 process's vmspace via  process's vmspace via
Line 1752  or its resource settings with
Line 2293  or its resource settings with
 before it disappears.  before it disappears.
 .Pp  .Pp
 This value is also inherited by the process's children.  This value is also inherited by the process's children.
   .It Li proc.pid.paxflags ( Dv PROC_PID_PAXFLAGS )
   This read-only variable returns the current value of the process's pax
   flags (see
   .Xr paxctl 8 ) .
 .El  .El
 .Sh The user.* subtree ( CTL_USER )  .Ss The user.* subtree ( Dv CTL_USER )
 The string and integer information available for the  The string and integer information available for the
 .Li user  .Li user
 level is detailed below.  level is detailed below.
 The changeable column shows whether a process with appropriate  The changeable column shows whether a process with appropriate
 privilege may change the value.  privilege may change the value.
 .Bl -column "USER_COLL_WEIGHTS_MAXXXX" "integerXXX" -offset indent  .Bl -column "user.coll_weights_max" "integer" "Changeable" -offset indent
 .It Sy Second level name        Type    Changeable  .It Sy Second level name Ta Sy Type Ta Sy Changeable
 .It user.atexit_max     integer no  .It user.atexit_max     integer no
 .It user.bc_base_max    integer no  .It user.bc_base_max    integer no
 .It user.bc_dim_max     integer no  .It user.bc_dim_max     integer no
Line 1785  privilege may change the value.
Line 2330  privilege may change the value.
 .It user.tzname_max     integer no  .It user.tzname_max     integer no
 .El  .El
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .Pp  .It Li user.atexit_max ( Dv USER_ATEXIT_MAX )
 .It Li user.atexit_max ( USER_ATEXIT_MAX )  
 The maximum number of functions that may be registered with  The maximum number of functions that may be registered with
 .Xr atexit 3 .  .Xr atexit 3 .
 .It Li user.bc_base_max ( USER_BC_BASE_MAX )  .It Li user.bc_base_max ( Dv USER_BC_BASE_MAX )
 The maximum ibase/obase values in the  The maximum ibase/obase values in the
 .Xr bc 1  .Xr bc 1
 utility.  utility.
 .It Li user.bc_dim_max ( USER_BC_DIM_MAX )  .It Li user.bc_dim_max ( Dv USER_BC_DIM_MAX )
 The maximum array size in the  The maximum array size in the
 .Xr bc 1  .Xr bc 1
 utility.  utility.
 .It Li user.bc_scale_max ( USER_BC_SCALE_MAX )  .It Li user.bc_scale_max ( Dv USER_BC_SCALE_MAX )
 The maximum scale value in the  The maximum scale value in the
 .Xr bc 1  .Xr bc 1
 utility.  utility.
 .It Li user.bc_string_max ( USER_BC_STRING_MAX )  .It Li user.bc_string_max ( Dv USER_BC_STRING_MAX )
 The maximum string length in the  The maximum string length in the
 .Xr bc 1  .Xr bc 1
 utility.  utility.
 .It Li user.coll_weights_max ( USER_COLL_WEIGHTS_MAX )  .It Li user.coll_weights_max ( Dv USER_COLL_WEIGHTS_MAX )
 The maximum number of weights that can be assigned to any entry of  The maximum number of weights that can be assigned to any entry of
 the LC_COLLATE order keyword in the locale definition file.  the LC_COLLATE order keyword in the locale definition file.
 .It Li user.cs_path ( USER_CS_PATH )  .It Li user.cs_path ( USER_CS_PATH )
 Return a value for the  Return a value for the
 .Ev PATH  .Ev PATH
 environment variable that finds all the standard utilities.  environment variable that finds all the standard utilities.
 .It Li user.expr_nest_max ( USER_EXPR_NEST_MAX )  .It Li user.expr_nest_max ( Dv USER_EXPR_NEST_MAX )
 The maximum number of expressions that can be nested within  The maximum number of expressions that can be nested within
 parenthesis by the  parenthesis by the
 .Xr expr 1  .Xr expr 1
 utility.  utility.
 .It Li user.line_max ( USER_LINE_MAX )  .It Li user.line_max ( Dv USER_LINE_MAX )
 The maximum length in bytes of a text-processing utility's input  The maximum length in bytes of a text-processing utility's input
 line.  line.
 .It Li user.posix2_char_term ( USER_POSIX2_CHAR_TERM )  .It Li user.posix2_char_term ( Dv USER_POSIX2_CHAR_TERM )
 Return 1 if the system supports at least one terminal type capable of  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
 .It Li user.posix2_c_bind ( USER_POSIX2_C_BIND )  .St -p1003.2 ,
   otherwise\ 0.
   .It Li user.posix2_c_bind ( Dv USER_POSIX2_C_BIND )
 Return 1 if the system's C-language development facilities support the  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 )  .It Li user.posix2_c_dev ( Dv USER_POSIX2_C_DEV )
 Return 1 if the system supports the C-Language Development Utilities Option,  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 )  .It Li user.posix2_fort_dev ( Dv USER_POSIX2_FORT_DEV )
 Return 1 if the system supports the FORTRAN Development Utilities Option,  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 )  .It Li user.posix2_fort_run ( Dv USER_POSIX2_FORT_RUN )
 Return 1 if the system supports the FORTRAN Runtime Utilities Option,  Return 1 if the system supports the FORTRAN Runtime Utilities Option,
 otherwise 0.  otherwise\ 0.
 .It Li user.posix2_localedef ( USER_POSIX2_LOCALEDEF )  .It Li user.posix2_localedef ( Dv 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 )  .It Li user.posix2_sw_dev ( Dv USER_POSIX2_SW_DEV )
 Return 1 if the system supports the Software Development Utilities Option,  Return 1 if the system supports the Software Development Utilities Option,
 otherwise 0.  otherwise\ 0.
 .It Li user.posix2_upe ( USER_POSIX2_UPE )  .It Li user.posix2_upe ( Dv USER_POSIX2_UPE )
 Return 1 if the system supports the User Portability Utilities Option,  Return 1 if the system supports the User Portability Utilities Option,
 otherwise 0.  otherwise\ 0.
 .It Li user.posix2_version ( USER_POSIX2_VERSION )  .It Li user.posix2_version ( Dv USER_POSIX2_VERSION )
 The version of POSIX 1003.2 with which the system attempts to comply.  The version of
 .It Li user.re_dup_max ( USER_RE_DUP_MAX )  .St -p1003.2
   with which the system attempts to comply.
   .It Li user.re_dup_max ( Dv USER_RE_DUP_MAX )
 The maximum number of repeated occurrences of a regular expression  The maximum number of repeated occurrences of a regular expression
 permitted when using interval notation.  permitted when using interval notation.
 .ne 1i  .It Li user.stream_max ( Dv USER_STREAM_MAX )
 .It Li user.stream_max ( USER_STREAM_MAX )  
 The minimum maximum number of streams that a process may have open  The minimum maximum number of streams that a process may have open
 at any one time.  at any one time.
 .It Li user.tzname_max ( USER_TZNAME_MAX )  .It Li user.tzname_max ( Dv USER_TZNAME_MAX )
 The minimum maximum number of types supported for the name of a  The minimum maximum number of types supported for the name of a
 timezone.  timezone.
 .El  .El
 .Sh The vm.* subtree ( CTL_VM )  .Ss The vm.* subtree ( Dv CTL_VM )
 The string and integer information available for the  The string and integer information available for the
 .Li vm  .Li vm
 level is detailed below.  level is detailed below.
 The changeable column shows whether a process with appropriate  The changeable column shows whether a process with appropriate
 privilege may change the value.  privilege may change the value.
 .Bl -column "Second level nameXXXXXX" "struct uvmexp_sysctlXXX" -offset indent  .Bl -column "Second level name" "struct uvmexp_sysctl" "Changeable" -offset indent
 .It Sy Second level name        Type    Changeable  .It Sy Second level name Ta Sy Type Ta Sy Changeable
 .It vm.anonmax  int     yes  .It vm.anonmax  int     yes
 .It vm.anonmin  int     yes  .It vm.anonmin  int     yes
 .It vm.bufcache int     yes  .It vm.bufcache int     yes
Line 1881  privilege may change the value.
Line 2428  privilege may change the value.
 .It vm.uvmexp   struct uvmexp   no  .It vm.uvmexp   struct uvmexp   no
 .It vm.uvmexp2  struct uvmexp_sysctl    no  .It vm.uvmexp2  struct uvmexp_sysctl    no
 .It vm.vmmeter  struct vmtotal  no  .It vm.vmmeter  struct vmtotal  no
   .It vm.proc.map struct kinfo_vmentry    no
   .It vm.guard_size       unsigned int    no
   .It vm.thread_guard_size        unsigned int    yes
 .El  .El
 .Pp  
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .It Li vm.anonmax ( VM_ANONMAX )  .It Li vm.anonmax ( Dv VM_ANONMAX )
 The percentage of physical memory which will be reclaimed  The percentage of physical memory which will be reclaimed
 from other types of memory usage to store anonymous application data.  from other types of memory usage to store anonymous application data.
 .It Li vm.anonmin ( VM_ANONMIN )  .It Li vm.anonmin ( Dv VM_ANONMIN )
 The percentage of physical memory which will be always be available for  The percentage of physical memory which will be always be available for
 anonymous application data.  anonymous application data.
 .It Li vm.bufcache ( VM_BUFCACHE )  .It Li vm.bufcache ( Dv VM_BUFCACHE )
 The percentage of physical memory which will be available  The percentage of physical memory which will be available
 for the buffer cache.  for the buffer cache.
 .It Li vm.bufmem ( VM_BUFMEM )  .It Li vm.bufmem ( Dv VM_BUFMEM )
 The amount of kernel memory that is being used by the buffer cache.  The amount of kernel memory that is being used by the buffer cache.
 .It Li vm.bufmem_lowater ( VM_BUFMEM_LOWATER )  .It Li vm.bufmem_lowater ( Dv VM_BUFMEM_LOWATER )
 The minimum amount of kernel memory to reserve for the  The minimum amount of kernel memory to reserve for the
 buffer cache.  buffer cache.
 .It Li vm.bufmem_hiwater ( VM_BUFMEM_HIWATER )  .It Li vm.bufmem_hiwater ( Dv VM_BUFMEM_HIWATER )
 The maximum amount of kernel memory to be used for the  The maximum amount of kernel memory to be used for the
 buffer cache.  buffer cache.
 .It Li vm.execmax ( VM_EXECMAX )  .It Li vm.execmax ( Dv VM_EXECMAX )
 The percentage of physical memory which will be reclaimed  The percentage of physical memory which will be reclaimed
 from other types of memory usage to store cached executable data.  from other types of memory usage to store cached executable data.
 .It Li vm.execmin ( VM_EXECMIN )  .It Li vm.execmin ( Dv VM_EXECMIN )
 The percentage of physical memory which will be always be available for  The percentage of physical memory which will be always be available for
 cached executable data.  cached executable data.
 .It Li vm.filemax ( VM_FILEMAX )  .It Li vm.filemax ( Dv VM_FILEMAX )
 The percentage of physical memory which will be reclaimed  The percentage of physical memory which will be reclaimed
 from other types of memory usage to store cached file data.  from other types of memory usage to store cached file data.
 .It Li vm.filemin ( VM_FILEMIN )  .It Li vm.filemin ( Dv VM_FILEMIN )
 The percentage of physical memory which will be always be available for  The percentage of physical memory which will be always be available for
 cached file data.  cached file data.
 .It Li vm.loadavg ( VM_LOADAVG )  .It Li vm.loadavg ( Dv VM_LOADAVG )
 Return the load average history.  Return the load average history.
 The returned data consists of a  The returned data consists of a
 .Va struct loadavg .  .Vt struct loadavg .
 .It Li vm.maxslp ( VM_MAXSLP )  .It Li vm.maxslp ( Dv VM_MAXSLP )
 The value of the maxslp kernel global variable.  The value of the maxslp kernel global variable.
 .It Li vm.vmmeter ( VM_METER )  .It Li vm.vmmeter ( Dv VM_METER )
 Return system wide virtual memory statistics.  Return system wide virtual memory statistics.
 The returned data consists of a  The returned data consists of a
 .Va struct vmtotal .  .Vt struct vmtotal .
 .It Li vm.uspace ( VM_USPACE )  .It vm.user_va0_disable
   A flag which controls whether user processes can map virtual address\ 0.
   .It Li vm.proc.map ( Dv VM_PROC )
   The third level is
   .Dv VM_PROC_MAP ,
   the fourth is the pid of the process to display the vm object entries for, and
   the fifth is the size of
   .Vt struct kinfo_vmentry .
   Returns an array of
   .Vt struct kinfo_vmentry
   objects.
   .It Li vm.uspace ( Dv VM_USPACE )
 The number of bytes allocated for each kernel stack.  The number of bytes allocated for each kernel stack.
 .It Li vm.uvmexp ( VM_UVMEXP )  .It Li vm.uvmexp ( Dv VM_UVMEXP )
 Return system wide virtual memory statistics.  Return system wide virtual memory statistics.
 The returned data consists of a  The returned data consists of a
 .Va struct uvmexp .  .Vt struct uvmexp .
 .It Li vm.uvmexp2 ( VM_UVMEXP2 )  .It Li vm.uvmexp2 ( Dv VM_UVMEXP2 )
 Return system wide virtual memory statistics.  Return system wide virtual memory statistics.
 The returned data consists of a  The returned data consists of a
 .Va struct uvmexp_sysctl .  .Vt struct uvmexp_sysctl .
   .It Li vm.guard_size
   Return system wide guard size for the main thread of a program.
   .It Li vm.thread_guard_size
   Return system wide default size for the guard area of all other threads
   of a program.
 .\" XXX vm.idlezero  .\" XXX vm.idlezero
 .El  .El
 .Sh The ddb.* subtree ( CTL_DDB )  .Ss The ddb.* subtree ( Dv CTL_DDB )
 The integer information available for the  The information available for the
 .Li ddb  .Li ddb
 level is detailed below.  level is detailed below.
 The changeable column shows whether a process with appropriate  The changeable column shows whether a process with appropriate
 privilege may change the value.  privilege may change the value.
 .\" XXX sort  .Bl -column "Second level name" "integer" "Changeable" -offset indent
 .Bl -column "ddb.fromconsoleXXX" "integerXXX" -offset indent  .It Sy Second level name Ta Sy Type Ta Sy Changeable
 .It Sy Second level name        Type    Changeable  .It ddb.commandonenter  string  yes
 .It ddb.radix   integer yes  .It ddb.dumpstack       integer yes
 .It ddb.maxoff  integer yes  .It ddb.fromconsole     integer yes
 .It ddb.lines   integer yes  .It ddb.lines   integer yes
 .It ddb.tabstops        integer yes  .It ddb.maxoff  integer yes
   .It ddb.maxwidth        integer yes
 .It ddb.onpanic integer yes  .It ddb.onpanic integer yes
 .It ddb.fromconsole     integer yes  .It ddb.panicstackframes        integer yes
   .It ddb.radix   integer yes
   .It ddb.tabstops        integer yes
   .It ddb.tee_msgbuf      integer yes
 .El  .El
 .Pp  
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .It Li ddb.radix ( DBCTL_RADIX )  .It Li ddb.commandonenter
 The input and output radix.  If not empty, the string is used as the DDB command to be executed each time
 .It Li ddb.maxoff ( DBCTL_MAXOFF )  DDB is entered.
 The maximum symbol offset.  .It Li ddb.dumpstack
 .It Li ddb.lines ( DBCTL_LINES )  A value of 1 causes a stack trace to be printed on entering ddb from a panic.
 Number of display lines.  A value of 0 disables this behaviour.
 .It Li ddb.tabstops ( DBCTL_TABSTOPS )  The default value is 1.
 Tab width.  .It Li ddb.fromconsole ( Dv DDBCTL_FROMCONSOLE )
 .It Li ddb.onpanic ( DBCTL_ONPANIC )  
 If non-zero, DDB will be entered when the kernel panics.  
 .It Li ddb.fromconsole ( DBCTL_FROMCONSOLE )  
 If not zero, DDB may be entered by sending a break on a serial  If not zero, DDB may be entered by sending a break on a serial
 console or by a special key sequence on a graphics console.  console or by a special key sequence on a graphics console.
 .\" XXX tee_msgbuf maxwidth commandonenter  .It Li ddb.lines ( Dv DDBCTL_LINES )
   Number of display lines.
   .It Li ddb.maxoff ( Dv DDBCTL_MAXOFF )
   The maximum symbol offset.
   .It Li ddb.maxwidth ( Dv DDBCTL_MAXWIDTH )
   The maximum output line width.
   .It Li ddb.onpanic ( Dv DDBCTL_ONPANIC )
   If greater than zero, DDB will be entered if the kernel panics.
   A value of 1 causes the system to enter DDB on panic.
   A value of 0 causes the kernel to attempt to print a stack trace, then
   reboot, while a value of \-1 means neither a stack trace will be printed
   nor DDB entered.
   .It Li ddb.panicstackframes
   Number of stack frames to display on panic.
   Useful to avoid scrolling away the interesting frames on a glass tty.
   Default value is
   .Dv 65535
   (all frames), useful value around
   .Dv 10 .
   .It Li ddb.radix ( Dv DDBCTL_RADIX )
   The input and output radix.
   .It Li ddb.tabstops ( Dv DDBCTL_TABSTOPS )
   Tab width.
   .It Li ddb.tee_msgbuf
   If not zero, DDB will output also to the kernel message buffer.
 .El  .El
 .Pp  .Pp
 These MIB nodes are also available as variables from within the DDB.  Some of these MIB
   nodes are also available as variables from within the debugger.
 See  See
 .Xr ddb 4  .Xr ddb 4
 for more details.  for more details.
 .Sh The security.* subtree ( CTL_SECURITY )  .Ss The security.* subtree ( Dv CTL_SECURITY )
 The  The
 .Li security  .Li security
 level contains various security-related settings for  level contains various security-related settings for
 the system.  the system.
 Available settings are detailed below.  The available second level names are:
   .Bl -column "Second level name" "integer" "Changeable" -offset indent
   .It Sy Second level name Ta Sy Type Ta Sy Changeable
   .It Li security.curtain integer yes
   .It Li security.models  node    not applicable
   .It Li security.pax     node    not applicable
   .El
 .Pp  .Pp
   Available settings are detailed below.
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .It Li security.curtain  .It Li security.curtain
 If non-zero, will filter return objects according to the user-id  If non-zero, will filter return objects according to the user ID
 requesting information about them, preventing from users any  requesting information about them, preventing users from
 access to objects they don't own.  accessing any objects they do not own.
 .Pp  .Pp
 At the moment, it affects  At the moment, it affects
 .Xr ps 1 ,  .Xr ps 1 ,
Line 1999  PCBs), and
Line 2596  PCBs), and
 .It Li security.models  .It Li security.models
 .Nx  .Nx
 supports pluggable security models.  supports pluggable security models.
 Every security model used, whether if loaded as an LKM or built with the system,  Every security model used, whether if loaded as a module or built with the system,
 is required to add an entry to this node with at least one element,  is required to add an entry to this node with at least one element,
 .Dq name ,  .Dq name ,
 indicating the name of the security model.  indicating the name of the security model.
Line 2014  Settings for PaX -- exploit mitigation f
Line 2611  Settings for PaX -- exploit mitigation f
 For more information on any of the PaX features, please see  For more information on any of the PaX features, please see
 .Xr paxctl 8  .Xr paxctl 8
 and  and
 .Xr security 8 .  .Xr security 7 .
 .Pp  The available third and fourth level names are:
   .Bl -column "security.pax.segvguard.suspend_timeout" "integer" "Changeable" \
   -offset 2n
   .It Sy Third and fourth level names Ta Sy Type Ta Sy Changeable
   .It Li security.pax.aslr.enabled        integer yes
   .\".It Li security.pax.aslr.exec_len    integer yes
   .It Li security.pax.aslr.global integer yes
   .\".It Li security.pax.aslr.mmap_len    integer yes
   .\".It Li security.pax.aslr.stack_len   integer yes
   .It Li security.pax.mprotect.enabled    integer yes
   .It Li security.pax.mprotect.global     integer yes
   .It Li security.pax.mprotect.ptrace     integer yes
   .It Li security.pax.segvguard.enabled   integer yes
   .It Li security.pax.segvguard.expiry_timeout    integer yes
   .It Li security.pax.segvguard.global    integer yes
   .It Li security.pax.segvguard.max_crashes       integer yes
   .It Li security.pax.segvguard.suspend_timeout   integer yes
   .El
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .It Li security.pax.aslr.enable  .It Li security.pax.aslr.enabled
 Enable PaX ASLR (Address Space Layout Randomization).  Enable PaX ASLR (Address Space Layout Randomization).
 .Pp  .Pp
 The value of this  The value of this
 knob must be non-zero for PaX ASLR to be enabled, even if a program is set to  knob must be non-zero for PaX ASLR to be enabled, even if a program is set to
 explicit enable.  explicit enable.
   .\".It Li security.pax.aslr.exec_len
   .\" XXX: Undocumented.
 .It Li security.pax.aslr.global  .It Li security.pax.aslr.global
 Specifies the default global policy for programs without an  Specifies the default global policy for programs without an
 explicit enable/disable flag.  explicit enable/disable flag.
 .Pp  .Pp
 When non-zero, all programs will get PaX ASLR, except those exempted with  When non-zero, all programs will get PaX ASLR, except those exempted with
 .Xr paxctl 8  .  .Xr paxctl 8 .
 Otherwise, all programs will not get PaX ASLR, except those specifically  Otherwise, all programs will not get PaX ASLR, except those specifically
 marked as such with  marked as such with
 .Xr paxctl 8 .  .Xr paxctl 8 .
 .It Li security.pax.mprotect.enable  .\".It Li security.pax.aslr.mmap_len
   .\" XXX: Undocumented.
   .\" .It Li security.pax.aslr.stack_len
   .\" XXX: Undocumented.
   .It Li security.pax.mprotect.enabled
 Enable PaX MPROTECT restrictions.  Enable PaX MPROTECT restrictions.
 .Pp  .Pp
 These are  These are
Line 2047  explicit enable/disable flag.
Line 2667  explicit enable/disable flag.
 .Pp  .Pp
 When non-zero, all programs will get the PaX MPROTECT restrictions,  When non-zero, all programs will get the PaX MPROTECT restrictions,
 except those exempted with  except those exempted with
 .Xr paxctl 8  .  .Xr paxctl 8 .
 Otherwise, all programs will not get the PaX MPROTECT restrictions,  Otherwise, all programs will not get the PaX MPROTECT restrictions,
 except those specifically marked as such with  except those specifically marked as such with
 .Xr paxctl 8 .  .Xr paxctl 8 .
 .It Li security.pax.segvguard.enable  .It Li security.pax.mprotect.ptrace
   This variable allows
   .Xr ptrace 2
   to override PaX MPROTECT permissions.
   It can have the following values:
   .Bl -tag -width XX -compact
   .It 0
   Does not let override any permissions.
   .It 1
   Disables PaX MPROTECT from processes that start executing while traced (default).
   .It 2
   Bypasses PaX MPROTECT for all processes being traced.
   .El
   .It Li security.pax.segvguard.enabled
 Enable PaX Segvguard.  Enable PaX Segvguard.
 .Pp  .Pp
 PaX Segvguard can detect and prevent certain exploitation attempts, where  PaX Segvguard can detect and prevent certain exploitation attempts, where
Line 2063  The
Line 2696  The
 .Nx  .Nx
 interface and implementation of the Segvguard is still experimental, and may  interface and implementation of the Segvguard is still experimental, and may
 change in future releases.  change in future releases.
   .It Li security.pax.segvguard.expiry_timeout
   If the max number was not reached within this timeout (in seconds), the entry
   will expire.
 .It Li security.pax.segvguard.global  .It Li security.pax.segvguard.global
 Specifies the default global policy for programs without an  Specifies the default global policy for programs without an
 explicit enable/disable flag.  explicit enable/disable flag.
 .Pp  .Pp
 When non-zero, all programs will get the PaX Segvguard,  When non-zero, all programs will get the PaX Segvguard,
 except those exempted with  except those exempted with
 .Xr paxctl 8  .  .Xr paxctl 8 .
 Otherwise, no program will get the PaX Segvguard restrictions,  Otherwise, no program will get the PaX Segvguard restrictions,
 except those specifically marked as such with  except those specifically marked as such with
 .Xr paxctl 8 .  .Xr paxctl 8 .
 .It Li security.pax.segvguard.expiry_timeout  .It Li security.pax.segvguard.max_crashes
 If the max number was not reached within this timeout (in seconds), the entry  The maximum number of segfaults a program can receive before suspension.
 will expire.  
 .It Li security.pax.segvguard.suspend_timeout  .It Li security.pax.segvguard.suspend_timeout
 Number of seconds to suspend a user from running a faulting program when the  Number of seconds to suspend a user from running a faulting program when the
 limit was exceeded.  limit was exceeded.
 .It Li security.pax.segvguard.max_crashes  
 Max number of segfaults a program can receive before suspension.  
 .El  .El
 .El  .El
 .Sh The vendor.* subtree ( CTL_VENDOR )  .Ss The vendor.* subtree ( Dv CTL_VENDOR )
 The  The
 .Li vendor  .Li vendor
 toplevel name is reserved to be used by vendors who wish to  toplevel name is reserved to be used by vendors who wish to
 have their own private MIB tree.  have their own private MIB tree.
 Intended use is to store values under  Intended use is to store values under
 .Dq vendor.\*[Lt]yourname\*[Gt].* .  .Dq vendor.<yourname>.* .
 .Sh SEE ALSO  .Sh SEE ALSO
 .Xr sysctl 3 ,  .Xr sysctl 3 ,
 .Xr ipsec 4 ,  .Xr ipsec 4 ,
 .Xr tcp 4 ,  .Xr tcp 4 ,
 .Xr security 8 ,  .Xr security 7 ,
 .Xr sysctl 8  .Xr sysctl 8
 .Sh HISTORY  .Sh HISTORY
 The  The

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Removed from v.1.16  
changed lines
  Added in v.1.131

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