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Diff for /src/share/man/man7/sysctl.7 between version 1.77 and 1.131

version 1.77, 2013/10/27 10:09:28 version 1.131, 2018/09/06 10:09:29
Line 29 
Line 29 
 .\"  .\"
 .\"     @(#)sysctl.3    8.4 (Berkeley) 5/9/95  .\"     @(#)sysctl.3    8.4 (Berkeley) 5/9/95
 .\"  .\"
 .Dd October 27, 2013  .Dd September 6, 2018
 .Dt SYSCTL 7  .Dt SYSCTL 7
 .Os  .Os
 .Sh NAME  .Sh NAME
Line 117  as a debugging variable, the following d
Line 117  as a debugging variable, the following d
 .Pp  .Pp
 .Bd -literal -offset indent -compact  .Bd -literal -offset indent -compact
 int dospecialcheck = 1;  int dospecialcheck = 1;
 struct ctldebug debug5 = { "dospecialcheck", \*[Am]dospecialcheck };  struct ctldebug debug5 = { "dospecialcheck", &dospecialcheck };
 .Ed  .Ed
 .Pp  .Pp
 Note that the dynamic implementation of  Note that the dynamic implementation of
Line 132  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 file systems.  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 "123456"  .Bl -tag -width "123456"
 .It Li vfs.generic.maxtypenum ( VFS_MAXTYPENUM )  .It Li vfs.generic.maxtypenum ( Dv VFS_MAXTYPENUM )
 The highest valid file system type number.  The highest valid file system type number.
 .It Li 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 ( VFS_USERMOUNT )  .It Li vfs.generic.usermount ( Dv VFS_USERMOUNT )
 Determines if non superuser mounts are allowed, defaults to  Determines if non superuser mounts are allowed, defaults to
 .Dv 0 .  .Dv 0 .
 .It Li vfs.generic.magiclinks ( VFS_MAGICLINKS )  .It Li vfs.generic.magiclinks ( Dv VFS_MAGICLINKS )
 Controls if expansion of variables is going to be performed on pathnames  Controls if expansion of variables is going to be performed on pathnames
 or not.  or not.
 Defaults to no variable expansion,  Defaults to no variable expansion,
Line 188  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 Ta Sy Type Ta 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 198  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
 .In 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 (4321, or 1234).  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
Line 242  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 270  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 Ta Sy Type Ta 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 312  privilege may change the value.
Line 315  privilege may change the value.
 .It kern.maxproc        integer yes  .It kern.maxproc        integer yes
 .It kern.maxptys        integer yes  .It kern.maxptys        integer yes
 .It kern.maxvnodes      integer yes  .It kern.maxvnodes      integer yes
   .It kern.messages       integer yes
 .It kern.mbuf   node    not applicable  .It kern.mbuf   node    not applicable
 .It kern.memlock        integer no  .It kern.memlock        integer no
 .It kern.memlock_range  integer no  .It kern.memlock_range  integer no
Line 329  privilege may change the value.
Line 333  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 350  privilege may change the value.
Line 355  privilege may change the value.
 .It kern.rtc_offset     integer yes  .It kern.rtc_offset     integer yes
 .It kern.saved_ids      integer no  .It kern.saved_ids      integer no
 .It kern.sbmax  integer yes  .It kern.sbmax  integer yes
 .\".It kern.sched       node    not applicable  .It kern.sched  node    not applicable
 .It kern.securelevel    integer raise only  .It kern.securelevel    integer raise only
 .It kern.somaxkva       integer yes  .It kern.somaxkva       integer yes
 .It kern.synchronized_io        integer no  .It kern.synchronized_io        integer no
Line 367  privilege may change the value.
Line 372  privilege may change the value.
 .El  .El
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .It Li kern.aio_listio_max  .It Li kern.aio_listio_max
 The maximum number of asynchronous  The maximum number of asynchronous I/O operations in a single list
 .Tn I/O  I/O call.
 operations in a single list I/O call.  
 Like with all variables related to  Like with all variables related to
 .Xr aio 3 ,  .Xr aio 3 ,
 the variable may be created and removed dynamically  the variable may be created and removed dynamically
Line 379  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
 .Pf ( Tn RNG )  .Pf ( 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
 .Vt 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.bufq  .It Li kern.bufq
 .\" XXX: Undocumented.  This variable contains information on the
 .It Li kern.ccpu ( KERN_CCPU )  .Xr bufq 9
   subsystem.
   Currently, the only third level name implemented is
   .Dv kern.bufq.strategies
   which provides a list of buffer queue strategies currently available.
   .It Li kern.buildinfo
   When the kernel is built, the build environment may optionally provide
   arbitrary information to be stored in this variable.
   .It Li kern.ccpu ( Dv KERN_CCPU )
 The scheduler exponential decay value.  The scheduler exponential decay value.
 .It Li kern.clockrate ( KERN_CLOCKRATE )  .It Li kern.clockrate ( Dv KERN_CLOCKRATE )
 A  A
 .Vt struct clockinfo  .Vt struct clockinfo
 structure is returned.  structure is returned.
Line 408  skew rate.
Line 420  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 421  The third level name is
Line 433  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 Ta Sy Type Ta 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 444  coredump.
Line 456  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  Returns an array of
 .Dv CPUSTATES  .Dv CPUSTATES
 .Vt uint64_t Ns s.  .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 463  in the
Line 475  in the
 system.  system.
 The available values are as follows:  The available values are as follows:
 .Bl -tag -width XX0 -offset indent  .Bl -tag -width XX0 -offset indent
 .It Dv \*[Lt] 0  .It Dv < 0
 Always force userlevel requests to use software transforms.  Always force userlevel requests to use software transforms.
 .It Dv = 0  .It Dv = 0
 If present, use hardware and grant userlevel requests for  If present, use hardware and grant userlevel requests for
 non-accelerated transforms (handling the latter in software).  non-accelerated transforms (handling the latter in software).
 .It Dv \*[Gt] 0  .It Dv > 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 488  and can be changed with the kernel confi
Line 500  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
 .Vt 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
Line 501  field is always a NUL terminated string.
Line 513  field is always a NUL terminated string.
 The  The
 .Va d_bmajor  .Va d_bmajor
 field will be set to \-1 if the driver doesn't have a block device.  field will be set to \-1 if the driver doesn't have a block device.
 .It Li kern.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
 .Vt struct filelist  .Vt struct filelist
 followed by an array of  followed by an array of
 .Vt 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 522  error to process.
Line 534  error to process.
 Useful to keep heavily forking runaway processes in bay.  Useful to keep heavily forking runaway processes in bay.
 Default zero (no sleep).  Default zero (no sleep).
 Maximum is 20 seconds.  Maximum is 20 seconds.
 .It Li kern.fscale ( KERN_FSCALE )  .It Li kern.fscale ( Dv KERN_FSCALE )
 The kernel fixed-point scale factor.  The kernel fixed-point scale factor.
 .It Li kern.fsync ( KERN_FSYNC )  .It Li kern.fsync ( Dv KERN_FSYNC )
 Return 1 if the  Return 1 if the
 .St -p1003.1b-93  .St -p1003.1b-93
 File Synchronization Option is available  File Synchronization Option is available
 on this system,  on this system,
 otherwise\ 0.  otherwise\ 0.
 .It Li kern.hardclock_ticks ( KERN_HARDCLOCK_TICKS )  .It Li kern.hardclock_ticks ( Dv KERN_HARDCLOCK_TICKS )
 Returns the number of  Returns the number of
 .Xr hardclock 9  .Xr hardclock 9
 ticks.  ticks.
 .It Li kern.hostid ( KERN_HOSTID )  .It Li kern.hist
   This variable contains kernel history data if the kernel was
   configured for any of the options
   .Dv UVHMIST ,
   .Dv USB_DEBUG ,
   .Dv BIOHIST ,
   or
   .Dv SCDEBUG .
   (See
   .Xr options 4
   for more details.)
   The third-level names correspond to each available history table.
   The values of the history tables are in an internal format, and can be
   decoded by the
   .Xr vmstat 1
   utility's
   .Fl U
   and
   .Fl u
   options;
   the
   .Fl l
   option can be used to see which tables are available.
   .It Li kern.hostid ( Dv KERN_HOSTID )
 Get or set the host identifier.  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
 .Vt iovec  .Vt iovec
 structures that a process has available for use with  structures that a process has available for use with
Line 555  structures that a process has available 
Line 590  structures that a process has available 
 .Xr sendmsg 2  .Xr sendmsg 2
 and  and
 .Xr writev 2 .  .Xr writev 2 .
 .It Li kern.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 Ta Sy Type Ta 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 576  The third level names for the ipc variab
Line 611  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 Ta 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 618  The
Line 652  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 641  Max number of number of semaphores in sy
Line 675  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  The offset within the sector specified by
 .Dv KERN_LABELSECTOR  .Dv KERN_LABELSECTOR
 of the  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  Returns 1 if the
 .St -p1003.1b-93  .St -p1003.1b-93
 Memory Mapped Files Option is available on this system,  Memory Mapped Files Option is available on this system,
 otherwise\ 0.  otherwise\ 0.
 .It Li kern.maxfiles ( KERN_MAXFILES )  .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.maxlwp  .It Li kern.maxlwp
 The maximum number of Lightweight Processes (threads) the system allows  The maximum number of Lightweight Processes (threads) the system allows
 per uid.  per uid.
 .It Li kern.maxphys ( KERN_MAXPHYS )  .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 694  The third level names for the mbuf varia
Line 728  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 Ta Sy Type Ta Sy Changeable
 .\" XXX Changeable? really?  .\" XXX Changeable? really?
 .It kern.mbuf.mblowat   integer yes  .It kern.mbuf.mblowat   integer yes
 .It kern.mbuf.mclbytes  integer yes  .It kern.mbuf.mclbytes  integer yes
Line 705  privilege may change the value.
Line 739  privilege may change the value.
 .Pp  .Pp
 The variables are as follows:  The variables are as follows:
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .It Li kern.mbuf.mblowat ( MBUF_MBLOWAT )  .It Li kern.mbuf.mblowat ( Dv MBUF_MBLOWAT )
 The mbuf low water mark.  The mbuf low water mark.
 .It Li kern.mbuf.mclbytes ( MBUF_MCLBYTES )  .It Li kern.mbuf.mclbytes ( Dv MBUF_MCLBYTES )
 The mbuf cluster size.  The mbuf cluster size.
 .It Li kern.mbuf.mcllowat ( MBUF_MCLLOWAT )  .It Li kern.mbuf.mcllowat ( Dv MBUF_MCLLOWAT )
 The mbuf cluster low water mark.  The mbuf cluster low water mark.
 .It Li kern.mbuf.msize ( MBUF_MSIZE )  .It Li kern.mbuf.msize ( Dv MBUF_MSIZE )
 The mbuf base size.  The mbuf base size.
 .It Li kern.mbuf.nmbclusters ( MBUF_NMBCLUSTERS )  .It Li kern.mbuf.nmbclusters ( Dv MBUF_NMBCLUSTERS )
 The limit on the number of mbuf clusters.  The limit on the number of mbuf clusters.
 The variable can only be increased, and only increased on machines with  The variable can only be increased, and only increased on machines with
 direct-mapped pool pages.  direct-mapped pool pages.
 .El  .El
 .It Li kern.memlock ( KERN_MEMLOCK )  .It Li kern.memlock ( Dv KERN_MEMLOCK )
 Returns 1 if the  Returns 1 if the
 .St -p1003.1b-93  .St -p1003.1b-93
 Process Memory Locking Option is available on this system,  Process Memory Locking Option is available on this system,
 otherwise\ 0.  otherwise\ 0.
 .It Li kern.memlock_range ( KERN_MEMLOCK_RANGE )  .It Li kern.memlock_range ( Dv KERN_MEMLOCK_RANGE )
 Returns 1 if the  Returns 1 if the
 .St -p1003.1b-93  .St -p1003.1b-93
 Range Memory Locking Option is available on this system,  Range Memory Locking Option is available on this system,
 otherwise\ 0.  otherwise\ 0.
 .It Li kern.memory_protection ( KERN_MEMORY_PROTECTION )  .It Li kern.memory_protection ( Dv KERN_MEMORY_PROTECTION )
 Returns 1 if the  Returns 1 if the
 .St -p1003.1b-93  .St -p1003.1b-93
 Memory Protection Option is available on this system,  Memory Protection Option is available on this system,
 otherwise\ 0.  otherwise\ 0.
   .It Li kern.messages
   Kernel console message verbosity.
   See
   .Aq Pa sys/reboot.h
   .Bl -column "verbosity" "setting" -offset indent
   .It Sy Value Ta Sy Verbosity Ta Sy sys/reboot.h equivalent
   .It 0 Ta Silent Ta Sy AB_SILENT
   .It 1 Ta Quiet Ta Sy AB_QUIET
   .It 2 Ta Normal Ta Sy AB_NORMAL
   .It 3 Ta Verbose Ta Sy AB_VERBOSE
   .It 4 Ta Debug Ta Sy AB_DEBUG
   .El
 .It Li kern.module  .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 Ta Sy Type Ta Sy Changeable
 .It kern.module.autoload        integer yes  .It kern.module.autoload        integer yes
 .It kern.module.verbose integer yes  .It kern.module.autotime        integer yes
   .It kern.module.verbose boolean yes
 .El  .El
 .Pp  .Pp
 The variables are as follows:  The variables are as follows:
Line 749  A boolean that controls whether kernel m
Line 796  A boolean that controls whether kernel m
 See  See
 .Xr module 7  .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  Returns the standard version the implementation of the
 .St -p1003.1b-93  .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 POSIX message queues; see
 .Tn POSIX  
 message queues; see  
 .Xr mqueue 3 .  .Xr mqueue 3 .
 This node is created dynamically when  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 Ta Sy Type Ta 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 788  The default maximum message count.
Line 837  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
 .Vt 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 Ta Sy Type Ta Sy Changeable
 .It kern.pipe.kvasiz    integer yes  .It kern.pipe.kvasiz    integer yes
 .It kern.pipe.maxbigpipes       integer yes  .It kern.pipe.maxbigpipes       integer yes
 .It kern.pipe.maxkvasz  integer yes  .It kern.pipe.maxkvasz  integer yes
Line 829  privilege may change the value.
Line 878  privilege may change the value.
 .Pp  .Pp
 The variables are as follows:  The variables are as follows:
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .It Li kern.pipe.kvasiz ( KERN_PIPE_KVASIZ )  .It Li kern.pipe.kvasiz ( Dv KERN_PIPE_KVASIZ )
 Amount of kernel memory consumed by pipe buffers.  Amount of kernel memory consumed by pipe buffers.
 .It Li kern.pipe.maxbigpipes ( KERN_PIPE_MAXBIGPIPES )  .It Li kern.pipe.maxbigpipes ( Dv KERN_PIPE_MAXBIGPIPES )
 Maximum number of  Maximum number of
 .Dq big  .Dq big
 pipes.  pipes.
 .It Li kern.pipe.maxkvasz ( KERN_PIPE_MAXKVASZ )  .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  Number of
 .Dq big  .Dq big
 pipes.  pipes.
 .El  .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  The version of ISO/IEC 9945
 .Pq St -p1003.1  .Pq St -p1003.1
 with which the system attempts to comply.  with which the system attempts to comply.
Line 854  with which the system attempts to comply
Line 909  with which the system attempts to comply
 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
Line 870  option to which the system attempts to c
Line 925  option to which the system attempts to c
 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
 .Vt struct kinfo_proc  .Vt struct kinfo_proc
Line 906  structures is returned,
Line 961  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 Ta Sy Fourth level is :
 .It KERN_PROC_ALL       None  .It KERN_PROC_ALL       None
 .It KERN_PROC_GID       A group ID  .It KERN_PROC_GID       A group ID
 .It KERN_PROC_PID       A process ID  .It KERN_PROC_PID       A process ID
Line 917  The third and fourth level numeric names
Line 972  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  As for
 .Dv KERN_PROC ,  .Dv KERN_PROC ,
 but an array of  but an array of
Line 926  structures are returned.
Line 981  structures are returned.
 The fifth level name is the size of the  The fifth level name is the size of the
 .Vt 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_PATHNAME" "The full pathname of the executable" -offset indent
 .It KERN_PROC_ARGV      The argv strings  .It Dv KERN_PROC_ARGV   The argv strings
 .It KERN_PROC_ENV       The environ strings  .It Dv KERN_PROC_ENV    The environ strings
 .It KERN_PROC_NARGV     The number of argv strings  .It Dv KERN_PROC_NARGV  The number of argv strings
 .It KERN_PROC_NENV      The number of environ strings  .It Dv KERN_PROC_NENV   The number of environ strings
   .It Dv KERN_PROC_PATHNAME       The full pathname of the executable
 .El  .El
 .It Li kern.profiling ( KERN_PROF )  .It Li kern.profiling ( Dv KERN_PROF )
 Return profiling information about the kernel.  Return profiling information about the kernel.
 If the kernel is not compiled for profiling,  If the kernel is not compiled for profiling,
 attempts to retrieve any of the  attempts to retrieve any of the
Line 950  is detailed below.
Line 1006  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 Ta Sy Type Ta Sy Changeable
 .It kern.profiling.count        u_short[\|]     yes  .It kern.profiling.count        u_short[\|]     yes
 .It kern.profiling.froms        u_short[\|]     yes  .It kern.profiling.froms        u_short[\|]     yes
 .It kern.profiling.gmonparam    struct gmonparam        no  .It kern.profiling.gmonparam    struct gmonparam        no
Line 960  privilege may change the value.
Line 1016  privilege may change the value.
 .Pp  .Pp
 The variables are as follows:  The variables are as follows:
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .It Li kern.profiling.count ( GPROF_COUNT )  .It Li kern.profiling.count ( Dv GPROF_COUNT )
 Array of statistical program counter counts.  Array of statistical program counter counts.
 .It Li kern.profiling.froms ( GPROF_FROMS )  .It Li kern.profiling.froms ( Dv GPROF_FROMS )
 Array indexed by program counter of call-from points.  Array indexed by program counter of call-from points.
 .It Li kern.profiling.gmonparams ( GPROF_GMONPARAM )  .It Li kern.profiling.gmonparams ( Dv GPROF_GMONPARAM )
 Structure giving the sizes of the above arrays.  Structure giving the sizes of the above arrays.
 .It Li kern.profiling.state ( GPROF_STATE )  .It Li kern.profiling.state ( Dv GPROF_STATE )
 Profiling state.  Profiling state.
 If set to  If set to
 .Dv GMON_PROF_ON ,  .Dv GMON_PROF_ON ,
Line 974  starts profiling.
Line 1030  starts profiling.
 If set to  If set to
 .Dv GMON_PROF_OFF ,  .Dv GMON_PROF_OFF ,
 stops profiling.  stops profiling.
 .It Li kern.profiling.tos ( GPROF_TOS )  .It Li kern.profiling.tos ( Dv GPROF_TOS )
 Array of  Array of
 .Vt 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 ( dynamic )
 .\" XXX: Undocumented.  Influence the scheduling of LWPs, their priorisation and how they are
 .It Li kern.somaxkva ( KERN_SOMAXKVA )  distributed on and moved between CPUs.
   .Bl -column "kern.sched.balance_period" "integer" "Changeable" -offset indent
   .It Sy Third level name    Sy Type       Sy Changeable
   .It kern.sched.cacheht_time        integer       yes
   .It kern.sched.balance_period      integer       yes
   .It kern.sched.average_weight      integer       yes
   .It kern.sched.min_catch           integer       yes
   .It kern.sched.timesoftints        integer       yes
   .It kern.sched.kpreempt_pri        integer       yes
   .It kern.sched.upreempt_pri        integer       yes
   .It kern.sched.maxts       integer       yes
   .It kern.sched.mints       integer       yes
   .It kern.sched.name        string        no
   .It kern.sched.rtts        integer       no
   .It kern.sched.pri_min     integer       no
   .It kern.sched.pri_max     integer       no
   .El
   .Pp
   The variables are as follows:
   .Bl -tag -width "123456"
   .It Li kern.sched.cacheht_time ( dynamic )
   Cache hotness time in which a LWP is kept on one particular CPU
   and not moved to another CPU.
   This reduces the overhead of flushing and reloading caches.
   Defaults to 3ms.
   Needs to be given in
   .Dq hz
   units, see
   .Xr mstohz 9 .
   .It Li kern.sched.balance_period ( dynamic )
   Interval at which the CPU queues are checked for re-balancing.
   Defaults to 300ms.
   Needs to be given in
   .Dq hz
   units, see
   .Xr mstohz 9 .
   .It Li kern.sched.average_weight ( dynamic )
   Can be used to influence how likely LWPs are to be migrated from
   one CPU's queue of LWPs that are ready to run to a different, idle CPU.
   The value gives the percentage for weighting the average count of
   migratable threads from the past against the current number of
   migratable threads.
   A small value gives more weight to the past, a larger values more weight
   on the current situation.
   Defaults to 50 and must be between 0 and 100.
   .It Li kern.sched.min_catch ( dynamic )
   Minimum count of migratable (runable) threads for catching (stealing)
   from another CPU.
   Defaults to 1 but can be increased to decrease chance of thread
   migration between CPUs.
   .It Li kern.sched.timesoftints ( dynamic )
   Enable tracking of CPU time for soft interrupts
   as part of a LWP's real execution time.
   Set to a non-zero value to enable,
   and see
   .Xr ps 1
   for printing CPU times.
   .It Li kern.sched.kpreempt_pri ( dynamic )
   Minimum priority to trigger kernel preemption.
   .It Li kern.sched.upreempt_pri ( dynamic )
   Minimum priority to trigger user preemption.
   .It Li kern.sched.maxts ( dynamic )
   Scheduler specific maximal time quantum (in milliseconds).
   Must be set to a value larger than
   .Dq mints
   and between 10 and
   .Dq hz
   as given by the
   .Dv kern.clockrate
   sysctl.
   Provided by the M2 scheduler.
   .It Li kern.sched.mints ( dynamic )
   Scheduler specific minimal time quantum (in milliseconds).
   Must be set to a value smaller than
   .Dq maxts
   and between 1 and
   .Dq hz
   as given by the
   .Dq kern.clockrate
   sysctl.
   Provided by the M2 scheduler.
   .It Li kern.sched.name ( dynamic )
   Scheduler name.
   Provided both by the M2 and the 4BSD scheduler.
   .It Li kern.sched.rtts ( dynamic )
   Fixed scheduler specific round-robin time quantum in milliseconds.
   Provided both by the M2 and the 4BSD scheduler.
   .It Li kern.sched.pri_min ( dynamic )
   Minimal POSIX real-time priority.
   See
   .Xr sched 3 .
   .It Li kern.sched.pri_max ( dynamic )
   Maximal POSIX real-time priority.
   See
   .Xr sched 3 .
   .El
   .It Li kern.somaxkva ( Dv KERN_SOMAXKVA )
 Maximum amount of kernel memory to be used for socket buffers.  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  Returns 1 if the
 .St -p1003.1b-93  .St -p1003.1b-93
 Synchronized I/O Option is available on this system,  Synchronized I/O Option is available on this system,
Line 1011  otherwise\ 0.
Line 1163  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 Ta Sy Type Ta 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 1026  The currently selected timecounter sourc
Line 1178  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 Ta Sy Type Ta Sy Changeable
 .It kern.tkstat.cancc   quad    no  .It kern.tkstat.cancc   quad    no
 .It kern.tkstat.nin     quad    no  .It kern.tkstat.nin     quad    no
 .It kern.tkstat.nout    quad    no  .It kern.tkstat.nout    quad    no
Line 1044  with appropriate privilege may change th
Line 1196  with appropriate privilege may change th
 .Pp  .Pp
 The variables are as follows:  The variables are as follows:
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .It Li kern.tkstat.cancc ( KERN_TKSTAT_CANCC )  .It Li kern.tkstat.cancc ( Dv KERN_TKSTAT_CANCC )
 The number of canonical input characters.  The number of canonical input characters.
 .It Li kern.tkstat.nin ( KERN_TKSTAT_NIN )  .It Li kern.tkstat.nin ( Dv KERN_TKSTAT_NIN )
 The total number of input characters.  The total number of input characters.
 .It Li kern.tkstat.nout ( KERN_TKSTAT_NOUT )  .It Li kern.tkstat.nout ( Dv KERN_TKSTAT_NOUT )
 The total number of output characters.  The total number of output characters.
 .It Li kern.tkstat.rawcc ( KERN_TKSTAT_RAWCC )  .It Li kern.tkstat.rawcc ( Dv KERN_TKSTAT_RAWCC )
 The number of raw input characters.  The number of raw input characters.
 .El  .El
 .It Li kern.tty  .It Li kern.tty
Line 1058  The third level names for the tty setup 
Line 1210  The third level names for the tty setup 
 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.tty.qsize" "int" "Changeable" -offset indent  .Bl -column "kern.tty.qsize" "int" "Changeable" -offset indent
 .It Sy Third level name Type    Changeable  .It Sy Third level name Ta Sy Type Ta Sy Changeable
 .It kern.tty.qsize      int     yes  .It kern.tty.qsize      int     yes
 .El  .El
 .Pp  .Pp
Line 1075  and
Line 1227  and
 .It Li kern.uidinfo  .It Li kern.uidinfo
 Resource usage for the current user.  Resource usage for the current user.
 .Bl -column "kern.uidinfo.proccnt" "integer" "Changeable" -offset indent  .Bl -column "kern.uidinfo.proccnt" "integer" "Changeable" -offset indent
 .It Sy Third level name Type    Changeable  .It Sy Third level name Ta Sy Type Ta Sy Changeable
 .It kern.uidinfo.proccnt        integer no  .It kern.uidinfo.proccnt        integer no
 .It kern.uidinfo.lwpcnt integer no  .It kern.uidinfo.lwpcnt integer no
 .It kern.uidinfo.lockcnt        integer no  .It kern.uidinfo.lockcnt        integer no
Line 1092  Number of locks held by the current user
Line 1244  Number of locks held by the current user
 .It Li kern.uidinfo.sbsize  .It Li kern.uidinfo.sbsize
 Number of bytes in socket buffers allocated to the current user.  Number of bytes in socket buffers allocated to the current user.
 .El  .El
 .It Li kern.urandom ( KERN_URND )  .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 1110  system.
Line 1262  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 Ta Sy Type Ta 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 1141  If 1, more messages will be printed (ie.
Line 1293  If 1, more messages will be printed (ie.
 fingerprint is accessed).  fingerprint is accessed).
 Verbose level 2 is debug mode.  Verbose level 2 is debug mode.
 .El  .El
 .It Li kern.version ( KERN_VERSION )  .It Li kern.version ( Dv KERN_VERSION )
 The system version string.  The system version string.
 .It Li kern.vnode ( KERN_VNODE )  .It Li kern.vnode ( Dv KERN_VNODE )
 Return the entire vnode table.  Return the entire vnode table.
 Note, the vnode table is not necessarily a consistent snapshot of  Note, the vnode table is not necessarily a consistent snapshot of
 the system.  the system.
Line 1159  followed by the vnode itself
Line 1311  followed by the vnode itself
 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 Ta Sy Type Ta 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 1172  privilege may change the value.
Line 1324  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 Ta Sy Type Ta Sy Changeable
 .It net.route   routing messages        no  .It net.route   routing messages        no
 .It net.inet    IPv4 values     yes  .It net.inet    IPv4 values     yes
 .It net.inet6   IPv6 values     yes  .It net.inet6   IPv6 values     yes
 .It net.key     IPsec key management values     yes  .It net.key     IPsec key management values     yes
 .El  .El
 .Pp  
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .It Li net.route ( PF_ROUTE )  .It Li net.route ( Dv PF_ROUTE )
 .\" XXX really?  .\" XXX really?
 Return the entire routing table or a subset of it.  Return the entire routing table or a subset of it.
 The data is returned as a sequence of routing messages (see  The data is returned as a sequence of routing messages (see
Line 1193  The fourth level name is an address fami
Line 1344  The fourth level name is an address fami
 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 Ta Sy Sixth level is :
 .It NET_RT_FLAGS        rtflags  .It NET_RT_FLAGS        rtflags
 .It NET_RT_DUMP None  .It NET_RT_DUMP None
 .It NET_RT_IFLIST       None  .It NET_RT_IFLIST       None
 .El  .El
 .It Li net.inet ( PF_INET )  .It Li net.inet ( Dv PF_INET )
 Get or set various global information about the IPv4  Get or set various global information about the IPv4
 .Pq Internet Protocol version 4 .  .Pq Internet Protocol version 4 .
 The third level name is the protocol.  The third level name is the protocol.
 The fourth level name is the variable name.  The fourth level name is the variable name.
 The currently defined protocols and names are:  The currently defined protocols and names are:
 .Bl -column "Protocol name" "sack.globalmaxholes" "integer" "Changeable" -offset 4n  .Bl -column "Protocol" "anonportalgo.available" "integer" "Changeable" -offset indent
 .It Sy Protocol name    Variable name   Type    Changeable  .It Sy Protocol Variable Ta Sy Type Ta Sy Changeable
 .It arp down    integer yes  .It arp down    integer yes
 .It arp keep    integer yes  .It arp keep    integer yes
 .It arp log_movements   integer yes  .It arp log_movements   integer yes
 .It arp log_permanent_modify    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 log_wrong_iface integer yes
 .It arp prune   integer yes  
 .It arp refresh integer yes  
 .It carp        allow   integer yes  .It carp        allow   integer yes
 .It carp        preempt integer yes  .It carp        preempt integer yes
 .It carp        log     integer yes  .It carp        log     integer yes
Line 1229  The currently defined protocols and name
Line 1379  The currently defined protocols and name
 .It ip  anonportmax     integer yes  .It ip  anonportmax     integer yes
 .It ip  anonportmin     integer yes  .It ip  anonportmin     integer yes
 .It ip  checkinterface  integer yes  .It ip  checkinterface  integer yes
   .It ip  dad_count       integer yes
 .It ip  directed-broadcast      integer yes  .It ip  directed-broadcast      integer yes
 .It ip  do_loopback_cksum       integer yes  .It ip  do_loopback_cksum       integer yes
 .It ip  forwarding      integer yes  .It ip  forwarding      integer yes
Line 1259  The currently defined protocols and name
Line 1410  The currently defined protocols and name
 .It tcp mss_ifmtu       integer yes  .It tcp mss_ifmtu       integer yes
 .It tcp win_scale       integer yes  .It tcp win_scale       integer yes
 .It tcp timestamps      integer yes  .It tcp timestamps      integer yes
 .It tcp compat_42       integer yes  
 .It tcp cwm     integer yes  .It tcp cwm     integer yes
 .It tcp cwm_burstsize   integer yes  .It tcp cwm_burstsize   integer yes
 .It tcp ack_on_push     integer yes  .It tcp ack_on_push     integer yes
Line 1294  The variables are as follows:
Line 1444  The variables are as follows:
 Failed ARP entry lifetime.  Failed ARP entry lifetime.
 .It Li arp.keep  .It Li arp.keep
 Valid ARP entry lifetime.  Valid ARP entry lifetime.
 .It Li arp.prune  
 ARP cache pruning interval.  
 .It Li arp.refresh  
 ARP entry refresh interval.  
 .It Li carp.allow  .It Li carp.allow
 If set to 0, incoming  If set to 0, incoming
 .Xr carp 4  .Xr carp 4
Line 1346  This cannot be set to less than 1024 or 
Line 1492  This cannot be set to less than 1024 or 
 .It Li ip.checkinterface  .It Li ip.checkinterface
 If set to non-zero, the host will reject packets addressed to it  If set to non-zero, the host will reject packets addressed to it
 that arrive on an interface not bound to that address.  that arrive on an interface not bound to that address.
 Currently, this must be disabled if ipnat is used to translate the  Currently, this must be disabled if NAT is used to translate the
 destination address to another local interface, or if addresses  destination address to another local interface, or if addresses
 are added to the loopback interface instead of the interface where  are added to the loopback interface instead of the interface where
 the packets for those packets are received.  the packets for those packets are received.
   .It Li ip.dad_count
   The number of
   .Xr arp 4
   probes sent for Address Conflict Detection.
   Set to 0 to disable this.
 .It Li ip.directed-broadcast  .It Li ip.directed-broadcast
 If set to 1, enables directed broadcast behavior for the host.  If set to 1, enables directed broadcast behavior for the host.
 .It Li ip.do_loopback_cksum  .It Li ip.do_loopback_cksum
Line 1451  This can avoid losing a round trip time 
Line 1602  This can avoid losing a round trip time 
 but has the caveat of potentially defeating TCP's delayed ACK algorithm.  but has the caveat of potentially defeating TCP's delayed ACK algorithm.
 Use of this option is generally not recommended, but  Use of this option is generally not recommended, but
 the variable exists in case your configuration really needs it.  the variable exists in case your configuration really needs it.
 .It Li tcp.compat_42  
 If set to 1, enables work-arounds for bugs in the 4.2BSD TCP implementation.  
 Use of this option is not recommended, although it may be  
 required in order to communicate with extremely old TCP implementations.  
 .It Li tcp.cwm  .It Li tcp.cwm
 If set to 1, enables use of the Hughes/Touch/Heidemann Congestion Window  If set to 1, enables use of the Hughes/Touch/Heidemann Congestion Window
 Monitoring algorithm.  Monitoring algorithm.
Line 1473  Perform TCP checksum on loopback.
Line 1620  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.
 The valid range  The valid range
 is 0 to 10 (maximum specified by draft-ietf-tcpm-initcwnd-08.txt),  is 0 to 10 (maximum specified by RFC6928),
 with a default of 4 (approximately 4K per RFC3390).  with a default of 4 (approximately 4K per RFC3390).
 .It Li tcp.init_win_local  .It Li tcp.init_win_local
 Like  Like
Line 1579  The default UDP send buffer size.
Line 1726  The default UDP send buffer size.
 .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 Ta Sy Type Ta Sy Changeable
 .It icmp6       errppslimit     integer yes  .It icmp6       errppslimit     integer yes
 .It icmp6       mtudisc_hiwat   integer yes  .It icmp6       mtudisc_hiwat   integer yes
 .It icmp6       mtudisc_lowat   integer yes  .It icmp6       mtudisc_lowat   integer yes
Line 1601  The currently defined protocols and name
Line 1748  The currently defined protocols and name
 .It icmp6       rediraccept     integer yes  .It icmp6       rediraccept     integer yes
 .It icmp6       redirtimeout    integer yes  .It icmp6       redirtimeout    integer yes
 .It ip6 accept_rtadv    integer yes  .It ip6 accept_rtadv    integer yes
   .It ip6 addctlpolicy    struct in6_addrpolicy   no
 .It ip6 anonportalgo.selected   string  yes  .It ip6 anonportalgo.selected   string  yes
 .It ip6 anonportalgo.available  string  yes  .It ip6 anonportalgo.available  string  yes
 .It ip6 anonportalgo.reserve    struct  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 1756  The maximum number of fragments the node
Line 1904  The maximum number of fragments the node
 \-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  .It Li ip6.neighborgcthresh
 Maximum number of entries in neighbor cache.  Maximum number of entries in neighbor cache per interface.
 Set to negative to disable.  Set to negative to disable.
 The default value is 2048.  The default value is 2048.
 .It Li ip6.redirect  .It Li ip6.redirect
Line 1866  Default UDP receive buffer size.
Line 2014  Default UDP receive buffer size.
 Default UDP send buffer size.  Default UDP send buffer size.
 .El  .El
 .Pp  .Pp
 We reuse net.*.tcp for  We reuse net.*.tcp for TCP over IPv6,
 .Tn TCP  
 over  
 .Tn IPv6 ,  
 and therefore we do not have variables net.*.tcp6.  and therefore we do not have variables net.*.tcp6.
 Variables net.inet6.udp6 have identical meaning to net.inet.udp.  Variables net.inet6.udp6 have identical meaning to net.inet.udp.
 Please refer to  Please refer to
Line 1877  Please refer to
Line 2022  Please refer to
 section above.  section above.
 For variables net.*.ipsec6, please refer to  For variables net.*.ipsec6, please refer to
 .Xr ipsec 4 .  .Xr ipsec 4 .
 .It Li net.key ( PF_KEY )  .It Li net.key ( Dv PF_KEY )
 Get or set various global information about the IPsec key management.  Get or set various global information about the IPsec key management.
 The third level name is the variable name.  The third level name is the variable name.
 The currently defined variable and names are:  The currently defined variable and names are:
 .Bl -column "blockacq_lifetime" "integer" "Changeable" -offset indent  .Bl -column "blockacq_lifetime" "integer" "Changeable" -offset indent
 .It Sy Variable name    Type    Changeable  .It Sy Variable Type Ta Sy Changeable
 .It debug       integer yes  .It debug       integer yes
   .It enabled     integer yes
   .It used        integer no
 .It spi_try     integer yes  .It spi_try     integer yes
 .It spi_min_value       integer yes  .It spi_min_value       integer yes
 .It spi_max_value       integer yes  .It spi_max_value       integer yes
Line 1894  The currently defined variable and names
Line 2041  The currently defined variable and names
 .It esp_auth    integer yes  .It esp_auth    integer yes
 .It ah_keymin   integer yes  .It ah_keymin   integer yes
 .El  .El
 .Pp  
 The variables are as follows:  The variables are as follows:
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .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
 .In netkey/key_debug.h .  .In netipsec/key_debug.h .
   .It Li enabled
   Control processing of IPsec control messages.
   .Bl -tag -width indent
   .It 0
   Never allow IPsec processing
   .It 1
   Allow IPsec processing when SPD policies are present.
   .It 2
   Force IPsec processing even when SPD policies are not present.
   .El
   .It Li used
   Based on if IPsec is enabled, and SPD rule existence, show if
   IPsec is being used.
   Note that currently once IPsec is being used, it cannot be disabled.
 .It Li spi_try  .It Li spi_try
 The number of times the kernel will try to obtain an unique SPI  The number of times the kernel will try to obtain an unique SPI
 when it generates it from random number generator.  when it generates it from random number generator.
Line 1930  Minimum AH key length, in bits,
Line 2090  Minimum AH key length, in bits,
 The value is used when the kernel creates proposal payload  The value is used when the kernel creates proposal payload
 on ACQUIRE PF_KEY message.  on ACQUIRE PF_KEY message.
 .El  .El
   .It Li net.local ( Dv PF_LOCAL )
   Get or set various global information about
   .Dv AF_LOCAL
   type sockets.
   For some variables, the third level name is the variable name:
   .Bl -column "Variable" "integer" "Changeable" -offset indent
   .It Sy Variable Type Ta Sy Changeable
   .It inflight    integer no
   .It deferred    integer no
   .El
   The variables are as follows:
   .Bl -tag -width "123456"
   .It Li inflight
   The number of file descriptors currently passed between processes,
   .Qq in flight .
   .It Li deferred
   The number of file descriptors passed between processes that have been
   deferred for cleanup by a kernel task.
   .El
   .Pp
   Other variables are specific to a socket type:
   .Bl -column "seqpacket" "sendspace" "integer" "Changeable" -offset indent
   .It Sy "Socket Type"    Sy Variable     Type Ta Sy Changeable
   .It dgram       pcblist struct  no
   .It dgram       recvspace       integer yes
   .It dgram       sendspace       integer yes
   .It seqpacket   pcblist struct  no
   .It stream      pcblist struct  no
   .It stream      recvspace       integer yes
   .It stream      sendspace       integer yes
   .El
   The variables are as follows:
   .Bl -tag -width "123456"
   .It Li dgram.pcblist
   The Protocol Control Block list structure for datagram sockets.
   Parsed by
   .Xr netstat 8
   or
   .Xr sockstat 8 .
   .It Li dgram.recvspace
   The default datagram receive buffer size.
   .It Li dgram.sendspace
   The default datagram send buffer size.
   .It Li seqpacket.pcblist
   The Protocol Control Block list structure for Sequential Packet sockets.
   Parsed by
   .Xr netstat 8
   or
   .Xr sockstat 8 .
   .It Li stream.pcblist
   The Protocol Control Block list structure for stream sockets.
   Parsed by
   .Xr netstat 8
   or
   .Xr sockstat 8 .
   .It Li stream.recvspace
   The default stream receive buffer size.
   .It Li stream.sendspace
   The default stream send buffer size.
   .El
 .El  .El
 .Ss The proc.* subtree  .Ss The proc.* subtree
 The string and integer information available for the  The string and integer information available for the
Line 1946  value of PROC_PID_CORENAME is reset to t
Line 2166  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 Ta Sy Type Ta Sy Changeable
 .It proc.pid.corename   string  yes  .It proc.pid.corename   string  yes
 .It proc.pid.rlimit     node    not applicable  .It proc.pid.rlimit     node    not applicable
 .It proc.pid.stopfork   int     yes  .It proc.pid.stopfork   int     yes
 .It proc.pid.stopexec   int     yes  .It proc.pid.stopexec   int     yes
 .It proc.pid.stopexit   int     yes  .It proc.pid.stopexit   int     yes
   .It proc.pid.paxflags   int     no
 .El  .El
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .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).
Line 1965  or end with the suffix
Line 2186  or end with the suffix
 (the super-user may set arbitrary names).  (the super-user may set arbitrary names).
 By default it points to  By default it points to
 .Dv KERN_DEFCORENAME .  .Dv KERN_DEFCORENAME .
 .It Li proc.pid.rlimit ( PROC_PID_LIMIT )  .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
Line 1973  and
Line 2194  and
 system calls.  system calls.
 The fourth level name is one of:  The fourth level name is one of:
 .Bl -tag -width "123456"  .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 2013  set by the
Line 2234  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 )  .Li soft ( Dv PROC_PID_LIMIT_TYPE_SOFT )
 or  or
 .Li hard ( PROC_PID_LIMIT_TYPE_HARD ) ,  .Li hard ( Dv PROC_PID_LIMIT_TYPE_HARD ) ,
 to select respectively the soft or hard limit.  to select respectively the soft or hard limit.
 Both are of type integer.  Both are of type integer.
 .It Li proc.pid.stopfork ( PROC_PID_STOPFORK )  .It Li proc.pid.stopfork ( Dv PROC_PID_STOPFORK )
 If non zero, the process' children will be stopped after  If non zero, the process' children will be stopped after
 .Xr fork 2  .Xr fork 2
 calls.  calls.
 The children is created in the SSTOP state and is never scheduled  The children are created in the SSTOP state and are never scheduled
 for running before being stopped.  for running before being stopped.
 This feature helps attaching a process with a debugger such as  This feature enables attaching to a process with a debugger such as
 .Xr gdb 1  .Xr gdb 1
 before it had the opportunity to actually do anything.  before the process has the opportunity to actually do anything.
 .Pp  .Pp
 This value is inherited by the process's children, and it also  This value is inherited by the process's children, and it also
 apply to emulation specific system calls that fork a new process, such as  applies to emulation specific system calls that fork a new process, such as
 .Fn sproc  .Fn sproc
 or  or
 .Fn clone .  .Fn clone .
 .It Li proc.pid.stopexec ( PROC_PID_STOPEXEC )  .It Li proc.pid.stopexec ( Dv PROC_PID_STOPEXEC )
 If non zero, the process will be stopped on next  If non zero, the process will be stopped on the next
 .Xr exec 3  .Xr exec 3
 call.  call.
 The process created by  The process created by
 .Xr exec 3  .Xr exec 3
 is created in the SSTOP state and is never scheduled for running  is created in the SSTOP state and is never scheduled for running
 before being stopped.  before being stopped.
 This feature helps attaching a process with a debugger such as  This feature enables attaching to a process with a debugger such as
 .Xr gdb 1  .Xr gdb 1
 before it had the opportunity to actually do anything.  before the process has the opportunity to actually do anything.
 .Pp  .Pp
 This value is inherited by the process's children.  This value is inherited by the process's children.
 .It Li proc.pid.stopexit ( PROC_PID_STOPEXIT )  .It Li proc.pid.stopexit ( Dv PROC_PID_STOPEXIT )
 If non zero, the process will be stopped on when it has cause to exit,  If non zero, the process will be stopped when it has cause to exit,
 either by way of calling  either by way of calling
 .Xr exit 3 ,  .Xr exit 3 ,
 .Xr _exit 2 ,  .Xr _exit 2 ,
 or by the receipt of a specific signal.  or by the receipt of a specific signal.
 The process is stopped before any of its resources or vm space is  The process is stopped before any of its resources or vm space is
 released allowing examination of the termination state of a process  released allowing examination of the termination state of the process
 before it disappears.  before it disappears.
 This feature can be used to examine the final conditions of the  This feature can be used to examine the final conditions of the
 process's vmspace via  process's vmspace via
Line 2066  or its resource settings with
Line 2293  or its resource settings with
 before it disappears.  before it disappears.
 .Pp  .Pp
 This value is also inherited by the process's children.  This value is also inherited by the process's children.
   .It Li proc.pid.paxflags ( Dv PROC_PID_PAXFLAGS )
   This read-only variable returns the current value of the process's pax
   flags (see
   .Xr paxctl 8 ) .
 .El  .El
 .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 Ta Sy Type Ta Sy Changeable
 .It user.atexit_max     integer no  .It user.atexit_max     integer no
 .It user.bc_base_max    integer no  .It user.bc_base_max    integer no
 .It user.bc_dim_max     integer no  .It user.bc_dim_max     integer no
Line 2099  privilege may change the value.
Line 2330  privilege may change the value.
 .It user.tzname_max     integer no  .It user.tzname_max     integer no
 .El  .El
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .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  all operations described in
 .St -p1003.2 ,  .St -p1003.2 ,
 otherwise\ 0.  otherwise\ 0.
 .It Li user.posix2_c_bind ( USER_POSIX2_C_BIND )  .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  The version of
 .St -p1003.2  .St -p1003.2
 with which the system attempts to comply.  with which the system attempts to comply.
 .It Li user.re_dup_max ( USER_RE_DUP_MAX )  .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 Ta Sy Type Ta Sy Changeable
 .It vm.anonmax  int     yes  .It vm.anonmax  int     yes
 .It vm.anonmin  int     yes  .It vm.anonmin  int     yes
 .It vm.bufcache int     yes  .It vm.bufcache int     yes
Line 2197  privilege may change the value.
Line 2428  privilege may change the value.
 .It vm.uvmexp   struct uvmexp   no  .It vm.uvmexp   struct uvmexp   no
 .It vm.uvmexp2  struct uvmexp_sysctl    no  .It vm.uvmexp2  struct uvmexp_sysctl    no
 .It vm.vmmeter  struct vmtotal  no  .It vm.vmmeter  struct vmtotal  no
   .It vm.proc.map struct kinfo_vmentry    no
   .It vm.guard_size       unsigned int    no
   .It vm.thread_guard_size        unsigned int    yes
 .El  .El
 .Pp  
 .Bl -tag -width "123456"  .Bl -tag -width "123456"
 .It Li vm.anonmax ( VM_ANONMAX )  .It Li vm.anonmax ( Dv VM_ANONMAX )
 The percentage of physical memory which will be reclaimed  The percentage of physical memory which will be reclaimed
 from other types of memory usage to store anonymous application data.  from other types of memory usage to store anonymous application data.
 .It Li vm.anonmin ( VM_ANONMIN )  .It Li vm.anonmin ( Dv VM_ANONMIN )
 The percentage of physical memory which will be always be available for  The percentage of physical memory which will be always be available for
 anonymous application data.  anonymous application data.
 .It Li vm.bufcache ( VM_BUFCACHE )  .It Li vm.bufcache ( Dv VM_BUFCACHE )
 The percentage of physical memory which will be available  The percentage of physical memory which will be available
 for the buffer cache.  for the buffer cache.
 .It Li vm.bufmem ( VM_BUFMEM )  .It Li vm.bufmem ( Dv VM_BUFMEM )
 The amount of kernel memory that is being used by the buffer cache.  The amount of kernel memory that is being used by the buffer cache.
 .It Li vm.bufmem_lowater ( VM_BUFMEM_LOWATER )  .It Li vm.bufmem_lowater ( Dv VM_BUFMEM_LOWATER )
 The minimum amount of kernel memory to reserve for the  The minimum amount of kernel memory to reserve for the
 buffer cache.  buffer cache.
 .It Li vm.bufmem_hiwater ( VM_BUFMEM_HIWATER )  .It Li vm.bufmem_hiwater ( Dv VM_BUFMEM_HIWATER )
 The maximum amount of kernel memory to be used for the  The maximum amount of kernel memory to be used for the
 buffer cache.  buffer cache.
 .It Li vm.execmax ( VM_EXECMAX )  .It Li vm.execmax ( Dv VM_EXECMAX )
 The percentage of physical memory which will be reclaimed  The percentage of physical memory which will be reclaimed
 from other types of memory usage to store cached executable data.  from other types of memory usage to store cached executable data.
 .It Li vm.execmin ( VM_EXECMIN )  .It Li vm.execmin ( Dv VM_EXECMIN )
 The percentage of physical memory which will be always be available for  The percentage of physical memory which will be always be available for
 cached executable data.  cached executable data.
 .It Li vm.filemax ( VM_FILEMAX )  .It Li vm.filemax ( Dv VM_FILEMAX )
 The percentage of physical memory which will be reclaimed  The percentage of physical memory which will be reclaimed
 from other types of memory usage to store cached file data.  from other types of memory usage to store cached file data.
 .It Li vm.filemin ( VM_FILEMIN )  .It Li vm.filemin ( Dv VM_FILEMIN )
 The percentage of physical memory which will be always be available for  The percentage of physical memory which will be always be available for
 cached file data.  cached file data.
 .It Li vm.loadavg ( VM_LOADAVG )  .It Li vm.loadavg ( Dv VM_LOADAVG )
 Return the load average history.  Return the load average history.
 The returned data consists of a  The returned data consists of a
 .Vt 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
 .Vt 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.proc.map ( Dv VM_PROC )
   The third level is
   .Dv VM_PROC_MAP ,
   the fourth is the pid of the process to display the vm object entries for, and
   the fifth is the size of
   .Vt struct kinfo_vmentry .
   Returns an array of
   .Vt struct kinfo_vmentry
   objects.
   .It Li vm.uspace ( Dv VM_USPACE )
 The number of bytes allocated for each kernel stack.  The number of bytes allocated for each kernel stack.
 .It Li vm.uvmexp ( VM_UVMEXP )  .It Li vm.uvmexp ( Dv VM_UVMEXP )
 Return system wide virtual memory statistics.  Return system wide virtual memory statistics.
 The returned data consists of a  The returned data consists of a
 .Vt 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
 .Vt struct uvmexp_sysctl .  .Vt struct uvmexp_sysctl .
   .It Li vm.guard_size
   Return system wide guard size for the main thread of a program.
   .It Li vm.thread_guard_size
   Return system wide default size for the guard area of all other threads
   of a program.
 .\" XXX vm.idlezero  .\" XXX vm.idlezero
 .El  .El
 .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.
 The changeable column shows whether a process with appropriate  The changeable column shows whether a process with appropriate
 privilege may change the value.  privilege may change the value.
 .\" XXX sort  
 .Bl -column "Second level name" "integer" "Changeable" -offset indent  .Bl -column "Second level name" "integer" "Changeable" -offset indent
 .It Sy Second level name        Type    Changeable  .It Sy Second level name Ta Sy Type Ta Sy Changeable
 .It ddb.radix   integer yes  .It ddb.commandonenter  string  yes
   .It ddb.dumpstack       integer yes
   .It ddb.fromconsole     integer yes
   .It ddb.lines   integer yes
 .It ddb.maxoff  integer yes  .It ddb.maxoff  integer yes
 .It ddb.maxwidth        integer yes  .It ddb.maxwidth        integer yes
 .It ddb.lines   integer yes  
 .It ddb.tabstops        integer yes  
 .It ddb.onpanic integer yes  .It ddb.onpanic integer yes
 .It ddb.fromconsole     integer yes  .It ddb.panicstackframes        integer yes
   .It ddb.radix   integer yes
   .It ddb.tabstops        integer yes
 .It ddb.tee_msgbuf      integer yes  .It ddb.tee_msgbuf      integer 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.commandonenter
 The input and output radix.  If not empty, the string is used as the DDB command to be executed each time
 .It Li ddb.maxoff ( DDBCTL_MAXOFF )  DDB is entered.
   .It Li ddb.dumpstack
   A value of 1 causes a stack trace to be printed on entering ddb from a panic.
   A value of 0 disables this behaviour.
   The default value is 1.
   .It Li ddb.fromconsole ( Dv DDBCTL_FROMCONSOLE )
   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.
   .It Li ddb.lines ( Dv DDBCTL_LINES )
   Number of display lines.
   .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.onpanic ( Dv DDBCTL_ONPANIC )
 Number of display lines.  
 .It Li ddb.tabstops ( DDBCTL_TABSTOPS )  
 Tab width.  
 .It Li ddb.onpanic ( DDBCTL_ONPANIC )  
 If greater than zero, DDB will be entered if the kernel panics.  If greater than zero, DDB will be entered if the kernel panics.
 A value of 1 causes the system to enter DDB on panic, while a value of 2  A value of 1 causes the system to enter DDB on panic.
 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  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  reboot, while a value of \-1 means neither a stack trace will be printed
 nor DDB entered.  nor DDB entered.
 .It Li ddb.fromconsole ( DDBCTL_FROMCONSOLE )  .It Li ddb.panicstackframes
 If not zero, DDB may be entered by sending a break on a serial  Number of stack frames to display on panic.
 console or by a special key sequence on a graphics console.  Useful to avoid scrolling away the interesting frames on a glass tty.
   Default value is
   .Dv 65535
   (all frames), useful value around
   .Dv 10 .
   .It Li ddb.radix ( Dv DDBCTL_RADIX )
   The input and output radix.
   .It Li ddb.tabstops ( Dv DDBCTL_TABSTOPS )
   Tab width.
 .It Li ddb.tee_msgbuf  .It Li ddb.tee_msgbuf
 If not zero, DDB will output also to the kernel message buffer.  If not zero, DDB will output also to the kernel message buffer.
 .It Li ddb.commandonenter  
 If not empty, a command to be executed on each enter to the  
 .Tn DDB .  
 .\"  
 .\" XXX: (a) ddb.commandonenter is missing in ddb(4);  
 .\"      (b) No DDBCTL definitions for tee_msgbuf and commandonenter.  
 .El  .El
 .Pp  .Pp
 Some of these  Some of these MIB
 .Tn MIB  
 nodes are also available as variables from within the debugger.  nodes are also available as variables from within the debugger.
 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 Ta Sy Type Ta 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 ID
 .Tn ID  requesting information about them, preventing users from
 requesting information about them, preventing from users any  accessing any objects they do not own.
 access to objects they do not own.  
 .Pp  .Pp
 At the moment, it affects  At the moment, it affects
 .Xr ps 1 ,  .Xr ps 1 ,
Line 2372  The available third and fourth level nam
Line 2623  The available third and fourth level nam
 .\".It Li security.pax.aslr.stack_len   integer yes  .\".It Li security.pax.aslr.stack_len   integer yes
 .It Li security.pax.mprotect.enabled    integer yes  .It Li security.pax.mprotect.enabled    integer yes
 .It Li security.pax.mprotect.global     integer yes  .It Li security.pax.mprotect.global     integer yes
   .It Li security.pax.mprotect.ptrace     integer yes
 .It Li security.pax.segvguard.enabled   integer yes  .It Li security.pax.segvguard.enabled   integer yes
 .It Li security.pax.segvguard.expiry_timeout    integer yes  .It Li security.pax.segvguard.expiry_timeout    integer yes
 .It Li security.pax.segvguard.global    integer yes  .It Li security.pax.segvguard.global    integer yes
 .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 2420  except those exempted with
Line 2671  except those exempted with
 Otherwise, all programs will not get the PaX MPROTECT restrictions,  Otherwise, all programs will not get the PaX MPROTECT restrictions,
 except those specifically marked as such with  except those specifically marked as such with
 .Xr paxctl 8 .  .Xr paxctl 8 .
   .It Li security.pax.mprotect.ptrace
   This variable allows
   .Xr ptrace 2
   to override PaX MPROTECT permissions.
   It can have the following values:
   .Bl -tag -width XX -compact
   .It 0
   Does not let override any permissions.
   .It 1
   Disables PaX MPROTECT from processes that start executing while traced (default).
   .It 2
   Bypasses PaX MPROTECT for all processes being traced.
   .El
 .It Li security.pax.segvguard.enabled  .It Li security.pax.segvguard.enabled
 Enable PaX Segvguard.  Enable PaX Segvguard.
 .Pp  .Pp
Line 2452  Number of seconds to suspend a user from
Line 2716  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
 have their own private MIB tree.  have their own private MIB tree.
 Intended use is to store values under  Intended use is to store values under
 .Dq vendor.\*[Lt]yourname\*[Gt].* .  .Dq vendor.<yourname>.* .
 .Sh SEE ALSO  .Sh SEE ALSO
 .Xr sysctl 3 ,  .Xr sysctl 3 ,
 .Xr ipsec 4 ,  .Xr ipsec 4 ,

Legend:
Removed from v.1.77  
changed lines
  Added in v.1.131

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