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Diff for /src/share/man/man7/sysctl.7 between version 1.52 and 1.92

version 1.52, 2010/12/11 19:55:53 version 1.92, 2015/07/11 17:36:09
Line 29 
Line 29 
 .\"  .\"
 .\"     @(#)sysctl.3    8.4 (Berkeley) 5/9/95  .\"     @(#)sysctl.3    8.4 (Berkeley) 5/9/95
 .\"  .\"
 .Dd December 11, 2010  .Dd July 11, 2015
 .Dt SYSCTL 7  .Dt SYSCTL 7
 .Os  .Os
 .Sh NAME  .Sh NAME
Line 69  See the
Line 69  See the
 .Xr sysctl 3  .Xr sysctl 3
 manual page for programming examples.  manual page for programming examples.
 .Ss Top level names  .Ss Top level names
 The top level names are defined with a CTL_ prefix in  The top level names are defined with a
   .Va CTL_
   prefix in
 .In sys/sysctl.h ,  .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 security CTL_SECURITY "Next level names" "High kernel limits"  .Bl -column "security" ".Dv CTL_SECURITY" ".In uvm/uvm_param.h" "High kernel limits"
 .It Sy Name     Constant        Next level names        Description  .It Sy Name  Ta Sy Constant     Ta Sy Next level names Ta Sy Description
 .It kern        CTL_KERN        sys/sysctl.h    High kernel limits  .It kern     Ta Dv CTL_KERN     Ta In sys/sysctl.h     Ta High kernel limits
 .It vm  CTL_VM  uvm/uvm_param.h Virtual memory  .It vm       Ta Dv CTL_VM       Ta In uvm/uvm_param.h  Ta Virtual memory
 .It vfs CTL_VFS sys/mount.h     Filesystem  .It vfs      Ta Dv CTL_VFS      Ta In sys/mount.h      Ta Filesystem
 .It net CTL_NET sys/socket.h    Networking  .It net      Ta Dv CTL_NET      Ta In sys/socket.h     Ta Networking
 .It debug       CTL_DEBUG       sys/sysctl.h    Debugging  .It debug    Ta Dv CTL_DEBUG    Ta In sys/sysctl.h     Ta Debugging
 .It hw  CTL_HW  sys/sysctl.h    Generic CPU, I/O  .It hw       Ta Dv CTL_HW       Ta In sys/sysctl.h     Ta Generic CPU, I/O
 .It machdep     CTL_MACHDEP     sys/sysctl.h    Machine dependent  .It machdep  Ta Dv CTL_MACHDEP  Ta In sys/sysctl.h     Ta Machine dependent
 .It user        CTL_USER        sys/sysctl.h    User-level  .It user     Ta Dv CTL_USER     Ta In sys/sysctl.h     Ta User-level
 .It ddb CTL_DDB sys/sysctl.h    In-kernel debugger  .It ddb      Ta Dv CTL_DDB      Ta In sys/sysctl.h     Ta In-kernel debugger
 .It proc        CTL_PROC        sys/sysctl.h    Per-process  .It proc     Ta Dv CTL_PROC     Ta In sys/sysctl.h     Ta Per-process
 .It vendor      CTL_VENDOR      ?       Vendor specific  .It vendor   Ta Dv CTL_VENDOR   Ta ?                   Ta Vendor specific
 .It emul        CTL_EMUL        sys/sysctl.h    Emulation settings  .It emul     Ta Dv CTL_EMUL     Ta In sys/sysctl.h     Ta Emulation settings
 .It security    CTL_SECURITY    sys/sysctl.h    Security settings  .It security Ta Dv CTL_SECURITY Ta In sys/sysctl.h     Ta Security settings
 .El  .El
 .Ss The debug.* subtree  .Ss The debug.* subtree
 The debugging variables vary from system to system.  The debugging variables vary from system to system.
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  .Pp
 .Bd -literal -offset indent -compact  .Bd -literal -offset indent -compact
Line 130  See
Line 132  See
 for more information.  for more information.
 .Ss 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.
 It has the following third level identifiers:  It has the following third level identifiers:
 .Bl -tag -width compact  .Bl -tag -width "123456"
 .It vfs.generic.maxtypenum ( VFS_MAXTYPENUM )  .It Li vfs.generic.maxtypenum ( Dv VFS_MAXTYPENUM )
 The highest valid filesystem type number.  The highest valid file system type number.
 .It vfs.generic.conf ( VFS_CONF )  .It Li vfs.generic.conf ( Dv VFS_CONF )
 Returns configuration information about the file-system type given as a fourth  Returns configuration information about the file system type given as a fourth
 level identifier.  level identifier.
   .It Li vfs.generic.usermount ( Dv VFS_USERMOUNT )
   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  .El
 .Pp  .Pp
 The remaining second level identifiers are the file-system names, identified  The remaining second level identifiers are the file system names, identified
 by the type number returned by a  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.
 .Ss 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
Line 156  level is detailed below.
Line 188  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 "hw.machine_arch" "integer" "Changeable" -offset indent  .Bl -column "hw.machine_arch" "integer" "Changeable" -offset indent
 .It Sy Second level name        Type    Changeable  .It Sy Second level name        Sy Type Sy Changeable
 .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 166  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.alignbytes ( HW_ALIGNBYTES )  .It Li hw.alignbytes ( Dv 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 210  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.
 .It Li hw.pagesize ( HW_PAGESIZE )  .It Li hw.ncpuonline ( Dv HW_NCPUONLINE )
   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
 .Ss The kern.* subtree  .Ss The kern.* subtree
Line 238  The changeable column shows whether a pr
Line 272  The changeable column shows whether a pr
 privilege may change the value.  privilege may change the value.
 .Bl -column "kern.posix_reader_writer_locks" \  .Bl -column "kern.posix_reader_writer_locks" \
 "struct kinfo_drivers" "not applicable"  "struct kinfo_drivers" "not applicable"
 .It Sy Second level name        Type    Changeable  .It Sy Second level name        Sy Type Sy Changeable
 .It kern.aio_listio_max integer yes  .It kern.aio_listio_max integer yes
 .It kern.aio_max        integer yes  .It kern.aio_max        integer yes
 .It kern.arandom        integer no  .It kern.arandom        integer no
 .It kern.argmax integer no  .It kern.argmax integer no
 .It kern.boothowto      integer no  .It kern.boothowto      integer no
 .It kern.boottime       struct timeval  no  .It kern.boottime       struct timeval  no
   .It kern.buildinfo      string  no
 .\".It kern.bufq        node    not applicable  .\".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
Line 274  privilege may change the value.
Line 309  privilege may change the value.
 .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
Line 296  privilege may change the value.
Line 332  privilege may change the value.
 .It kern.ostype string  no  .It kern.ostype string  no
 .\".It kern.panic_now   integer yes  .\".It kern.panic_now   integer yes
 .It kern.pipe   node    not applicable  .It kern.pipe   node    not applicable
   .It kern.pool   struct pool_sysctl      no
 .\" .It kern.posix      node    not applicable  .\" .It kern.posix      node    not applicable
 .It kern.posix1version  integer no  .It kern.posix1version  integer no
 .It kern.posix_aio      integer no  .It kern.posix_aio      integer no
Line 324  privilege may change the value.
Line 361  privilege may change the value.
 .It kern.timecounter    node    not applicable  .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.usercrypto     integer yes
 .It kern.userasymcrypto integer yes  .It kern.userasymcrypto integer yes
Line 345  The maximum number of asynchronous I/O o
Line 383  The maximum number of asynchronous I/O o
 .It Li kern.arandom  .It Li kern.arandom
 This variable picks a random number each time it is queried.  This variable picks a random number each time it is queried.
 The used random number generator  The used random number generator
 .Pq Tn RNG  .Pf ( Tn RNG )
 is based on  is based on
 .Xr arc4random 3 .  .Xr arc4random 3 .
 .It Li kern.argmax ( KERN_ARGMAX )  .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.boothowto  .It Li kern.boothowto
 Flags passed from the boot loader; see  Flags passed from the boot loader; see
 .Xr reboot 2  .Xr reboot 2
 for the meanings of the flags.  for the meanings of the flags.
 .It Li kern.boottime ( KERN_BOOTTIME )  .It Li kern.boottime ( Dv 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.buildinfo
   When the kernel is built, the build environment may optionally provide
   arbitrary information to be stored in this variable.
 .\" .It Li kern.bufq  .\" .It Li kern.bufq
 .\" XXX: Undocumented.  .\" XXX: Undocumented.
 .It Li kern.ccpu ( KERN_CCPU )  .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
Line 374  skew rate.
Line 415  skew rate.
 Refer to  Refer to
 .Xr hz 9  .Xr hz 9
 for additional details.  for additional details.
 .It Li kern.consdev ( KERN_CONSDEV )  .It Li kern.consdev ( Dv KERN_CONSDEV )
 Console device.  Console device.
 .It Li kern.coredump  .It Li kern.coredump
 Settings related to set-id processes coredumps.  Settings related to set-id processes coredumps.
Line 387  The third level name is
Line 428  The third level name is
 .Dv kern.coredump.setid  .Dv kern.coredump.setid
 and fourth level variables are described below.  and fourth level variables are described below.
 .Bl -column "kern.coredump.setid.group" "integer" "Changeable" -offset indent  .Bl -column "kern.coredump.setid.group" "integer" "Changeable" -offset indent
 .It Sy Fourth level name        Type    Changeable  .It Sy Fourth level name        Sy Type Sy Changeable
 .It kern.coredump.setid.dump    integer yes  .It kern.coredump.setid.dump    integer yes
 .It kern.coredump.setid.group   integer yes  .It kern.coredump.setid.group   integer yes
 .It kern.coredump.setid.mode    integer yes  .It kern.coredump.setid.mode    integer yes
Line 410  coredump.
Line 451  coredump.
 The path to which set-id processes' coredumps will be saved to.  The path to which set-id processes' coredumps will be saved to.
 Same syntax as kern.defcorename.  Same syntax as kern.defcorename.
 .El  .El
 .It Li kern.cp_id ( KERN_CP_ID )  .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
Line 435  non-accelerated transforms (handling the
Line 478  non-accelerated transforms (handling the
 .It Dv \*[Gt] 0  .It Dv \*[Gt] 0
 Allow user requests only for transforms which are hardware-accelerated.  Allow user requests only for transforms which are hardware-accelerated.
 .El  .El
 .It Li kern.defcorename ( KERN_DEFCORENAME )  .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 444  and
Line 487  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
Line 452  and can be changed with the kernel confi
Line 495  and can be changed with the kernel confi
 ).  ).
 .It Li kern.detachall  .It Li kern.detachall
 Detach all devices at shutdown.  Detach all devices at shutdown.
 .It Li kern.domainname ( KERN_DOMAINNAME )  .It Li kern.domainname ( Dv KERN_DOMAINNAME )
 Get or set the YP domain name.  Get or set the YP domain name.
 .It Li kern.drivers ( KERN_DRIVERS )  .It Li kern.drivers ( Dv 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 465  field is always a NUL terminated string.
Line 508  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.dump_on_panic ( KERN_DUMP_ON_PANIC )  .It Li kern.dump_on_panic ( Dv KERN_DUMP_ON_PANIC )
 Perform a crash dump on system  Perform a crash dump on system
 .Xr panic 9 .  .Xr panic 9 .
 .It Li kern.file ( KERN_FILE )  .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 486  error to process.
Line 529  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.hostid ( Dv KERN_HOSTID )
 Get or set the host identifier.  Get or set the host identifier.
 This is aimed to replace the legacy  This is aimed to replace the legacy
 .Xr gethostid 3  .Xr gethostid 3
 and  and
 .Xr sethostid 3  .Xr sethostid 3
 system calls.  system calls.
 .It Li kern.hostname ( KERN_HOSTNAME )  .It Li kern.hostname ( Dv KERN_HOSTNAME )
 Get or set the  Get or set the
 .Xr hostname 1 .  .Xr hostname 1 .
 .It Li kern.iov_max ( KERN_IOV_MAX )  .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 517  structures that a process has available 
Line 562  structures that a process has available 
 .Xr sendmsg 2  .Xr sendmsg 2
 and  and
 .Xr writev 2 .  .Xr writev 2 .
 .It Li kern.ipc ( KERN_SYSVIPC )  .It Li kern.ipc ( Dv KERN_SYSVIPC )
 Return information about the SysV IPC parameters.  Return information about the SysV IPC parameters.
 The third level names for the ipc variables are detailed below.  The third level names for the ipc variables are detailed below.
 .Bl -column "kern.ipc.shm_use_phys" "integer" "Changeable" -offset indent  .Bl -column "kern.ipc.shm_use_phys" "integer" "Changeable" -offset indent
 .It Sy Third level name Type    Changeable  .It Sy Third level name Sy Type Sy Changeable
 .It kern.ipc.sysvmsg    integer no  .It kern.ipc.sysvmsg    integer no
 .It kern.ipc.sysvsem    integer no  .It kern.ipc.sysvsem    integer no
 .It kern.ipc.sysvshm    integer no  .It kern.ipc.sysvshm    integer no
Line 538  The third level names for the ipc variab
Line 583  The third level names for the ipc variab
 .It kern.ipc.semmnu     integer yes  .It kern.ipc.semmnu     integer yes
 .El  .El
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .It Li kern.ipc.sysvmsg ( KERN_SYSVIPC_MSG )  .It Li kern.ipc.sysvmsg ( Dv KERN_SYSVIPC_MSG )
 Returns 1 if System V style message queue functionality is available  Returns 1 if System V style message queue functionality is available
 on this system,  on this system,
 otherwise 0.  otherwise\ 0.
 .It Li kern.ipc.sysvsem ( KERN_SYSVIPC_SEM )  .It Li kern.ipc.sysvsem ( Dv KERN_SYSVIPC_SEM )
 Returns 1 if System V style semaphore functionality is available  Returns 1 if System V style semaphore functionality is available
 on this system,  on this system,
 otherwise 0.  otherwise\ 0.
 .It Li kern.ipc.sysvshm ( KERN_SYSVIPC_SHM )  .It Li kern.ipc.sysvshm ( Dv KERN_SYSVIPC_SHM )
 Returns 1 if System V style share memory functionality is available  Returns 1 if System V style share memory functionality is available
 on this system,  on this system,
 otherwise 0.  otherwise\ 0.
 .It Li kern.ipc.sysvipc_info ( KERN_SYSVIPC_INFO )  .It Li kern.ipc.sysvipc_info ( Dv KERN_SYSVIPC_INFO )
 Return System V style IPC configuration and run-time information.  Return System V style IPC configuration and run-time information.
 The fourth level name selects the System V style IPC facility.  The fourth level name selects the System V style IPC facility.
 .Bl -column "KERN_SYSVIPC_MSG_INFO" "struct shm_sysctl_info" -offset indent  .Bl -column "KERN_SYSVIPC_MSG_INFO" "struct shm_sysctl_info" -offset indent
 .It Sy Fourth level name        Type  .It Sy Fourth level name        Sy Type
 .It KERN_SYSVIPC_MSG_INFO       struct msg_sysctl_info  .It KERN_SYSVIPC_MSG_INFO       struct msg_sysctl_info
 .It KERN_SYSVIPC_SEM_INFO       struct sem_sysctl_info  .It KERN_SYSVIPC_SEM_INFO       struct sem_sysctl_info
 .It KERN_SYSVIPC_SHM_INFO       struct shm_sysctl_info  .It KERN_SYSVIPC_SHM_INFO       struct shm_sysctl_info
 .El  .El
 .Pp  
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .It Li KERN_SYSVIPC_MSG_INFO  .It Li KERN_SYSVIPC_MSG_INFO
 Return information on the System V style message facility.  Return information on the System V style message facility.
Line 580  The
Line 624  The
 structure is defined in  structure is defined in
 .In sys/shm.h .  .In sys/shm.h .
 .El  .El
 .It Li kern.ipc.shmmax ( KERN_SYSVIPC_SHMMAX )  .It Li kern.ipc.shmmax ( Dv KERN_SYSVIPC_SHMMAX )
 Max shared memory segment size in bytes.  Max shared memory segment size in bytes.
 .It Li kern.ipc.shmmni ( KERN_SYSVIPC_SHMMNI )  .It Li kern.ipc.shmmni ( Dv KERN_SYSVIPC_SHMMNI )
 Max number of shared memory identifiers.  Max number of shared memory identifiers.
 .It Li kern.ipc.shmseg ( KERN_SYSVIPC_SHMSEG )  .It Li kern.ipc.shmseg ( Dv KERN_SYSVIPC_SHMSEG )
 Max shared memory segments per process.  Max shared memory segments per process.
 .It Li kern.ipc.shmmaxpgs ( KERN_SYSVIPC_SHMMAXPGS )  .It Li kern.ipc.shmmaxpgs ( Dv KERN_SYSVIPC_SHMMAXPGS )
 Max amount of shared memory in pages.  Max amount of shared memory in pages.
 .It Li kern.ipc.shm_use_phys ( KERN_SYSVIPC_SHMUSEPHYS )  .It Li kern.ipc.shm_use_phys ( Dv KERN_SYSVIPC_SHMUSEPHYS )
 Locking of shared memory in physical memory.  Locking of shared memory in physical memory.
 If 0, memory can be swapped  If 0, memory can be swapped
 out, otherwise it will be locked in physical memory.  out, otherwise it will be locked in physical memory.
Line 603  Max number of number of semaphores in sy
Line 647  Max number of number of semaphores in sy
 .It Li kern.ipc.semmnu  .It Li kern.ipc.semmnu
 Max number of undo structures in system.  Max number of undo structures in system.
 .El  .El
 .It Li kern.job_control ( KERN_JOB_CONTROL )  .It Li kern.job_control ( Dv KERN_JOB_CONTROL )
 Return 1 if job control is available on this system, otherwise 0.  Return 1 if job control is available on this system, otherwise\ 0.
 .It Li kern.labeloffset ( KERN_LABELOFFSET )  .It Li kern.labeloffset ( Dv KERN_LABELOFFSET )
 The offset within the sector specified by KERN_LABELSECTOR of the  The offset within the sector specified by
   .Dv KERN_LABELSECTOR
   of the
 .Xr disklabel 5 .  .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 650  The third level names for the mbuf varia
Line 700  The third level names for the mbuf varia
 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" "integer" "Changeable" -offset indent  .Bl -column "kern.mbuf.nmbclusters" "integer" "Changeable" -offset indent
 .It Sy Third level name Type    Changeable  .It Sy Third level name Sy Type 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 661  privilege may change the value.
Line 711  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
   .St -p1003.1b-93
   Memory Protection Option is available on this system,
   otherwise\ 0.
 .It Li kern.module  .It Li kern.module
 Settings related to kernel modules.  Settings related to kernel modules.
 The third level names for the settings are described below.  The third level names for the settings are described below.
 .Bl -column "kern.module.autoload" "integer" "Changeable" -offset indent  .Bl -column "kern.module.autoload" "integer" "Changeable" -offset indent
 .It Sy Third level name Type    Changeable  .It Sy Third level name Sy Type Sy Changeable
 .It kern.module.autoload        integer yes  .It kern.module.autoload        integer yes
   .It kern.module.autotime        integer yes
 .It kern.module.verbose integer yes  .It kern.module.verbose integer yes
 .El  .El
 .Pp  .Pp
Line 700  The variables are as follows:
Line 754  The variables are as follows:
 .It Li kern.module.autoload  .It Li kern.module.autoload
 A boolean that controls whether kernel modules are loaded automatically.  A boolean that controls whether kernel modules are loaded automatically.
 See  See
 .Xr module 9  .Xr module 7
 for additional details.  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  .It Li kern.module.verbose
 A boolean that enables or disables verbose  A boolean that enables or disables verbose
 debug messages related to kernel modules.  debug messages related to kernel modules.
 .El  .El
 .It Li kern.monotonic_clock ( KERN_MONOTONIC_CLOCK )  .It Li kern.monotonic_clock ( Dv KERN_MONOTONIC_CLOCK )
 Returns the standard version the implementation of the POSIX 1003.1b  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.mqueue  .It Li kern.mqueue
 Settings related to  Settings related to
 .Tn POSIX  .Tn POSIX
Line 719  This node is created dynamically when
Line 778  This node is created dynamically when
 the corresponding kernel module is loaded.  the corresponding kernel module is loaded.
 The third level names for the settings are described below.  The third level names for the settings are described below.
 .Bl -column "kern.mqueue.mq_max_msgsize" "integer" "Changeable" -offset indent  .Bl -column "kern.mqueue.mq_max_msgsize" "integer" "Changeable" -offset indent
 .It Sy Third level name Type    Changeable  .It Sy Third level name Sy Type Sy Changeable
 .It kern.mqueue.mq_open_max     integer yes  .It kern.mqueue.mq_open_max     integer yes
 .It kern.mqueue.mq_prio_max     integer yes  .It kern.mqueue.mq_prio_max     integer yes
 .It kern.mqueue.mq_max_msgsize  integer yes  .It kern.mqueue.mq_max_msgsize  integer yes
Line 740  The default maximum message count.
Line 799  The default maximum message count.
 .It Li kern.mqueue.mq_max_maxmsg  .It Li kern.mqueue.mq_max_maxmsg
 The maximum number of messages in a message queue.  The maximum number of messages in a message queue.
 .El  .El
 .It Li kern.msgbuf ( KERN_MSGBUF )  .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.no_sa_support  .\" .It Li kern.no_sa_support
 .\" XXX: Undocumented.  .\" XXX: Undocumented.
 .It Li kern.ntptime ( KERN_NTPTIME )  .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.panic_now  .\".It Li kern.panic_now
 .\" XXX: Undocumented.  .\" XXX: Undocumented.
 .It Li kern.pipe ( KERN_PIPE )  .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.maxbigpipes" "integer" "Changeable" -offset indent  .Bl -column "kern.pipe.maxbigpipes" "integer" "Changeable" -offset indent
 .It Sy Third level name Type    Changeable  .It Sy Third level name Sy Type 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 781  privilege may change the value.
Line 840  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
   pipes.
   .El
   .It Li kern.pool
   Provides statistics about the
   .Xr pool 9
   and
   .Xr pool_cache 9
   subsystems.
 .\" XXX: Undocumented .It Li kern.posix ( ? )  .\" XXX: Undocumented .It Li kern.posix ( ? )
 .\"      This is a node in which the only variable is semmax.  .\"      This is a node in which the only variable is semmax.
 .It Li kern.posix1version ( KERN_POSIX1 )  .It Li kern.posix1version ( Dv KERN_POSIX1 )
 The version of ISO/IEC 9945 (POSIX 1003.1) with which the system  The version of ISO/IEC 9945
 attempts to comply.  .Pq St -p1003.1
   with which the system attempts to comply.
 .It Li kern.posix_aio  .It Li kern.posix_aio
 The version of  The version of
 .St -p1003.1  .St -p1003.1
 and its Asynchronous I/O option to which the system attempts to conform.  and its Asynchronous I/O option to which the system attempts to conform.
 .It Li kern.posix_barriers ( KERN_POSIX_BARRIERS )  .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_sched  .\".It Li kern.posix_sched
 .\" XXX: Undocumented.  .\" XXX: Undocumented.
 .It Li kern.posix_semaphores ( KERN_POSIX_SEMAPHORES )  .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 "KERN_PROC_SESSION" "Fourth level is:" -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 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
Line 864  The third and fourth level numeric names
Line 934  The third and fourth level numeric names
 .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 "KERN_PROG_NARGV" "The number of environ strings" -offset indent  .Bl -column "KERN_PROG_NARGV" "The number of environ strings" -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
 .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" "Changeable" -offset indent  .Bl -column "kern.profiling.gmonparam" "struct gmonparam" "Changeable" -offset indent
 .It Sy Third level name Type    Changeable  .It Sy Third level name Sy Type 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 904  privilege may change the value.
Line 977  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.pset  .\" .It Li kern.pset
 .\" XXX: Undocumented.  .\" XXX: Undocumented.
 .It Li kern.rawpartition ( KERN_RAWPARTITION )  .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 )
 See  See
 .Xr secmodel_securelevel 9 .  .Xr secmodel_securelevel 9 .
 .\" .It Li kern.sched  .\" .It Li kern.sched
 .\" XXX: Undocumented.  .\" XXX: Undocumented.
 .It Li kern.somaxkva ( KERN_SOMAXKVA )  .It Li kern.somaxkva ( Dv KERN_SOMAXKVA )
 Maximum amount of kernel memory to be used for socket buffers.  Maximum amount of kernel memory to be used for socket buffers.
 .\" XXX units?  .\" XXX units?
 .It Li kern.synchronized_io ( KERN_SYNCHRONIZED_IO )  .It Li kern.synchronized_io ( Dv KERN_SYNCHRONIZED_IO )
 Returns 1 if the POSIX 1003.1b Synchronized I/O Option is available  Returns 1 if the
 on this system,  .St -p1003.1b-93
 otherwise 0.  Synchronized I/O Option is available on this system,
   otherwise\ 0.
 .It Li kern.timecounter ( dynamic )  .It Li kern.timecounter ( dynamic )
 Display and control the timecounter source of the system.  Display and control the timecounter source of the system.
 .Bl -column "kern.timecounter.timestepwarnings" "integer" "Changeable" -offset indent  .Bl -column "kern.timecounter.timestepwarnings" "integer" "Changeable" -offset indent
 .It Sy Third level name Type    Changeable  .It Sy Third level name Sy Type Sy Changeable
 .It kern.timecounter.choice     string  no  .It kern.timecounter.choice     string  no
 .It kern.timecounter.hardware   string  yes  .It kern.timecounter.hardware   string  yes
 .It kern.timecounter.timestepwarnings   integer yes  .It kern.timecounter.timestepwarnings   integer yes
Line 965  The currently selected timecounter sourc
Line 1043  The currently selected timecounter sourc
 .It Li kern.timecounter.timestepwarnings ( dynamic )  .It Li kern.timecounter.timestepwarnings ( dynamic )
 If non-zero display a message each time the time is stepped.  If non-zero display a message each time the time is stepped.
 .El  .El
 .It Li kern.timex ( KERN_TIMEX )  .It Li kern.timex ( Dv 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 "kern.tkstat.cancc" "quad" "Changeable" -offset indent  .Bl -column "kern.tkstat.cancc" "quad" "Changeable" -offset indent
 .It Sy Third level name Type    Changeable  .It Sy Third level name Sy Type 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 983  with appropriate privilege may change th
Line 1061  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 Sy Type 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 Sy Type 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  .It Li kern.usercrypto
 When enabled, allows userland to  When enabled, allows userland to
Line 1010  system.
Line 1127  system.
 Runtime information for  Runtime information for
 .Xr veriexec 8 .  .Xr veriexec 8 .
 .Bl -column "kern.veriexec.algorithms" "integer" "Changeable" -offset indent  .Bl -column "kern.veriexec.algorithms" "integer" "Changeable" -offset indent
 .It Sy Third level name Type    Changeable  .It Sy Third level name Sy Type Sy Changeable
 .It kern.veriexec.algorithms    string  no  .It kern.veriexec.algorithms    string  no
 .It kern.veriexec.count node    not applicable  .It kern.veriexec.count node    not applicable
 .It kern.veriexec.strict        integer yes  .It kern.veriexec.strict        integer yes
Line 1025  Each mount will be under its own
Line 1142  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 1041  If 1, more messages will be printed (ie.
Line 1158  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 .
 .\" XXX: Undocumented: kern.lwp: no children?  .\" XXX: Undocumented: kern.lwp: no children?
 .El  .El
 .Ss The machdep.* subtree  .Ss 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 "machdep.booted_kernel" "Type" "Changeable" -offset indent  .Bl -column "machdep.booted_kernel" "Type" "Changeable" -offset indent
 .It Sy Second level name        Type    Changeable  .It Sy Second level name        Sy Type Sy Changeable
 .It Li machdep.booted_kernel    string  no  .It Li machdep.booted_kernel    string  no
 .El  .El
 .\" XXX: Document the above.  .\" XXX: Document the above.
Line 1072  privilege may change the value.
Line 1189  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 name" "IPsec key management values" "Changeable" -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        Sy Type 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 1088  The data is returned as a sequence of ro
Line 1204  The data is returned as a sequence of ro
 for the header file, format and meaning).  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 name" "Sixth level is:" -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 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" "Changeable" -offset 4n  .Bl -column "Protocol" "anonportalgo.available" "integer" "Changeable" -offset indent
 .It Sy Protocol name    Variable name   Type    Changeable  .It Sy Protocol Variable        Sy Type Sy Changeable
 .It arp down    integer yes  .It arp down    integer yes
 .It arp keep    integer yes  .It arp keep    integer yes
   .It arp log_movements   integer yes
   .It arp log_permanent_modify    integer yes
   .It arp log_unknown_network     integer yes
   .It arp log_wrong_iface integer yes
 .It arp prune   integer yes  .It arp prune   integer yes
 .It arp refresh integer yes  .It arp refresh integer yes
 .It carp        allow   integer yes  .It carp        allow   integer yes
Line 1120  The currently defined protocols and name
Line 1240  The currently defined protocols and name
 .It icmp        redirtimeout    integer yes  .It icmp        redirtimeout    integer yes
 .It icmp        bmcastecho      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
Line 1222  believes it can send advertisements more
Line 1345  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 1359  Number of ticks to delay sending an ACK.
Line 1489  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 1458  It has no effect unless tcp.abc.enable i
Line 1588  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" "do_loopback_cksum" "integer" "Changeable" -offset indent  .Bl -column "Protocol" "anonportalgo.available" "integer" "Changeable" -offset indent
 .It Sy Protocol name    Variable name   Type    Changeable  .It Sy Protocol Variable        Sy Type 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 1488  The currently defined protocols and name
Line 1618  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 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 1503  The currently defined protocols and name
Line 1636  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 1523  and autoconfigures address prefixes and 
Line 1660  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 1566  The number of IPv6 extension headers per
Line 1710  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 1600  The lowest port number to use for TCP an
Line 1744  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 1616  The maximum number of fragments the node
Line 1772  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.
   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 1734  Please refer to
Line 1894  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" "Changeable" -offset indent  .Bl -column "blockacq_lifetime" "integer" "Changeable" -offset indent
 .It Sy Variable name    Type    Changeable  .It Sy Variable Type    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 1757  The variables are as follows:
Line 1919  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 netkey/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 existance, show if
   IPsec is being used.
   Note that currenly 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 1803  value of PROC_PID_CORENAME is reset to t
Line 1979  value of PROC_PID_CORENAME is reset to t
 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 "proc.pid.corename" "string" "not applicable" -offset indent  .Bl -column "proc.pid.corename" "string" "not applicable" -offset indent
 .It Sy Third level name Type    Changeable  .It Sy Third level name Sy Type 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
Line 1811  points to the current process, or the PI
Line 1987  points to the current process, or the PI
 .It proc.pid.stopexit   int     yes  .It proc.pid.stopexit   int     yes
 .El  .El
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .It Li proc.pid.corename ( PROC_PID_CORENAME )  .It Li proc.pid.corename ( Dv 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.
 .It Li proc.pid.rlimit.sbsize ( PROC_PID_LIMIT_SBSIZE )  .It Li proc.pid.rlimit.sbsize ( Dv PROC_PID_LIMIT_SBSIZE )
 The maximum size (in bytes) of the socket buffers  The maximum size (in bytes) of the socket buffers
 set by the  set by the
 .Xr setsockopt 2  .Xr setsockopt 2
Line 1867  set by the
Line 2046  set by the
 and  and
 .Dv SO_SNDBUF  .Dv SO_SNDBUF
 options.  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.
Line 1889  apply to emulation specific system calls
Line 2075  apply to emulation specific system calls
 .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 next
 .Xr exec 3  .Xr exec 3
 call.  call.
Line 1902  This feature helps attaching a process w
Line 2088  This feature helps attaching a process w
 before it had the opportunity to actually do anything.  before it had 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 on when it has cause to exit,
 either by way of calling  either by way of calling
 .Xr exit 3 ,  .Xr exit 3 ,
Line 1920  before it disappears.
Line 2106  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.
 .El  .El
 .Ss 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_max" "integer" "Changeable" -offset indent  .Bl -column "user.coll_weights_max" "integer" "Changeable" -offset indent
 .It Sy Second level name        Type    Changeable  .It Sy Second level name        Sy Type 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 1952  privilege may change the value.
Line 2138  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"
 .It Li user.atexit_max ( USER_ATEXIT_MAX )  .It Li user.atexit_max ( Dv 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.
 .It Li user.stream_max ( USER_STREAM_MAX )  .It Li user.stream_max ( Dv 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
 .Ss 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 name" "struct uvmexp_sysctl" "Changeable" -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        Sy Type 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 2047  privilege may change the value.
Line 2237  privilege may change the value.
 .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
 .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 vm.user_va0_disable  .It vm.user_va0_disable
 A flag which controls whether user processes can map virtual address 0.  A flag which controls whether user processes can map virtual address\ 0.
 .It Li vm.uspace ( VM_USPACE )  .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 .
 .\" XXX vm.idlezero  .\" XXX vm.idlezero
 .El  .El
 .Ss The ddb.* subtree ( CTL_DDB )  .Ss The ddb.* subtree ( Dv CTL_DDB )
 The information available for the  The information available for the
 .Li ddb  .Li ddb
 level is detailed below.  level is detailed below.
Line 2110  The changeable column shows whether a pr
Line 2299  The changeable column shows whether a pr
 privilege may change the value.  privilege may change the value.
 .\" XXX sort  .\" XXX sort
 .Bl -column "Second level name" "integer" "Changeable" -offset indent  .Bl -column "Second level name" "integer" "Changeable" -offset indent
 .It Sy Second level name        Type    Changeable  .It Sy Second level name        Sy Type Sy Changeable
 .It ddb.radix   integer yes  .It ddb.radix   integer yes
 .It ddb.maxoff  integer yes  .It ddb.maxoff  integer yes
 .It ddb.maxwidth        integer yes  .It ddb.maxwidth        integer yes
Line 2121  privilege may change the value.
Line 2310  privilege may change the value.
 .It ddb.tee_msgbuf      integer yes  .It ddb.tee_msgbuf      integer yes
 .It ddb.commandonenter  string  yes  .It ddb.commandonenter  string  yes
 .El  .El
 .Pp  
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .It Li ddb.radix ( DDBCTL_RADIX )  .It Li ddb.radix ( Dv DDBCTL_RADIX )
 The input and output radix.  The input and output radix.
 .It Li ddb.maxoff ( DDBCTL_MAXOFF )  .It Li ddb.maxoff ( Dv DDBCTL_MAXOFF )
 The maximum symbol offset.  The maximum symbol offset.
 .It Li ddb.maxwidth ( DDBCTL_MAXWIDTH )  .It Li ddb.maxwidth ( Dv DDBCTL_MAXWIDTH )
 The maximum output line width.  The maximum output line width.
 .It Li ddb.lines ( DDBCTL_LINES )  .It Li ddb.lines ( Dv DDBCTL_LINES )
 Number of display lines.  Number of display lines.
 .It Li ddb.tabstops ( DDBCTL_TABSTOPS )  .It Li ddb.tabstops ( Dv DDBCTL_TABSTOPS )
 Tab width.  Tab width.
 .It Li ddb.onpanic ( DDBCTL_ONPANIC )  .It Li ddb.onpanic ( Dv DDBCTL_ONPANIC )
 If non-zero, DDB will be entered if the kernel panics.  If greater than zero, DDB will be entered if the kernel panics.
 .It Li ddb.fromconsole ( DDBCTL_FROMCONSOLE )  A value of 1 causes the system to enter DDB on panic, while a value of 2
   causes the kernel to attempt to print out a stack trace before entering DDB.
   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.fromconsole ( Dv DDBCTL_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.
 .It Li ddb.tee_msgbuf  .It Li ddb.tee_msgbuf
Line 2154  nodes are also available as variables fr
Line 2347  nodes are also available as variables fr
 See  See
 .Xr ddb 4  .Xr ddb 4
 for more details.  for more details.
 .Ss 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.
 The available second level names are:  The available second level names are:
 .Bl -column "Second level name" "integer" "Changeable" -offset indent  .Bl -column "Second level name" "integer" "Changeable" -offset indent
 .It Sy Second level name        Type    Changeable  .It Sy Second level name        Sy Type Sy Changeable
 .It Li security.curtain integer yes  .It Li security.curtain integer yes
 .It Li security.models  node    not applicable  .It Li security.models  node    not applicable
 .It Li security.pax     node    not applicable  .It Li security.pax     node    not applicable
 .El  .El
 .Pp  .Pp
 Available settings are detailed below.  Available settings are detailed below.
 .Pp  
 .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  If non-zero, will filter return objects according to the user
Line 2204  Settings for PaX -- exploit mitigation f
Line 2396  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 .
 The available third and fourth level names are:  The available third and fourth level names are:
 .Bl -column "security.pax.segvguard.suspend_timeout" "integer" "Changeable" \  .Bl -column "security.pax.segvguard.suspend_timeout" "integer" "Changeable" \
 -offset 2n  -offset 2n
Line 2222  The available third and fourth level nam
Line 2414  The available third and fourth level nam
 .It Li security.pax.segvguard.max_crashes       integer yes  .It Li security.pax.segvguard.max_crashes       integer yes
 .It Li security.pax.segvguard.suspend_timeout   integer yes  .It Li security.pax.segvguard.suspend_timeout   integer yes
 .El  .El
 .Pp  
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .It Li security.pax.aslr.enabled  .It Li security.pax.aslr.enabled
 Enable PaX ASLR (Address Space Layout Randomization).  Enable PaX ASLR (Address Space Layout Randomization).
Line 2237  Specifies the default global policy for 
Line 2428  Specifies the default global policy for 
 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 .
Line 2260  explicit enable/disable flag.
Line 2451  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 .
Line 2285  explicit enable/disable flag.
Line 2476  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 .
Line 2296  Number of seconds to suspend a user from
Line 2487  Number of seconds to suspend a user from
 limit was exceeded.  limit was exceeded.
 .El  .El
 .El  .El
 .Ss 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
Line 2307  Intended use is to store values under
Line 2498  Intended use is to store values under
 .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.1.52  
changed lines
  Added in v.1.92

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