--- /dev/null
+++ Libc/Libc-1044.1.2/gen/FreeBSD/sysctl.3
@@ -0,0 +1,727 @@
+.\" Copyright (c) 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)sysctl.3	8.4 (Berkeley) 5/9/95
+.\" $FreeBSD$
+.\"
+.Dd May 17, 2013
+.Dt SYSCTL 3
+.Os
+.Sh NAME
+.Nm sysctl ,
+.Nm sysctlbyname ,
+.Nm sysctlnametomib
+.Nd get or set system information
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/sysctl.h
+.Ft int
+.Fn sysctl "int *name" "u_int namelen" "void *oldp" "size_t *oldlenp" "void *newp" "size_t newlen"
+.Ft int
+.Fn sysctlbyname "const char *name" "void *oldp" "size_t *oldlenp" "void *newp" "size_t newlen"
+.Ft int
+.Fn sysctlnametomib "const char *name" "int *mibp" "size_t *sizep"
+.Sh DESCRIPTION
+The
+.Fn sysctl
+function retrieves system information and allows processes with
+appropriate privileges to set system information.
+The information available from
+.Fn sysctl
+consists of integers, strings, and tables.
+Information may be retrieved and set from the command interface
+using the
+.Xr sysctl 8
+utility.
+.Pp
+Unless explicitly noted below,
+.Fn sysctl
+returns a consistent snapshot of the data requested.
+Consistency is obtained by locking the destination
+buffer into memory so that the data may be copied out without blocking.
+Calls to
+.Fn sysctl
+are serialized to avoid deadlock.
+.Pp
+The state is described using a ``Management Information Base'' (MIB)
+style name, listed in
+.Fa name ,
+which is a
+.Fa namelen
+length array of integers.
+.Pp
+The
+.Fn sysctlbyname
+function accepts an ASCII representation of the name and internally
+looks up the integer name vector.
+Apart from that, it behaves the same
+as the standard
+.Fn sysctl
+function.
+.Pp
+The information is copied into the buffer specified by
+.Fa oldp .
+The size of the buffer is given by the location specified by
+.Fa oldlenp
+before the call,
+and that location gives the amount of data copied after a successful call
+and after a call that returns with the error code
+.Er ENOMEM .
+If the amount of data available is greater
+than the size of the buffer supplied,
+the call supplies as much data as fits in the buffer provided
+and returns with the error code
+.Er ENOMEM .
+If the old value is not desired,
+.Fa oldp
+and
+.Fa oldlenp
+should be set to NULL.
+.Pp
+The size of the available data can be determined by calling
+.Fn sysctl
+with the
+.Dv NULL
+argument for
+.Fa oldp .
+The size of the available data will be returned in the location pointed to by
+.Fa oldlenp .
+For some operations, the amount of space may change often.
+For these operations,
+the system attempts to round up so that the returned size is
+large enough for a call to return the data shortly thereafter.
+.Pp
+To set a new value,
+.Fa newp
+is set to point to a buffer of length
+.Fa newlen
+from which the requested value is to be taken.
+If a new value is not to be set,
+.Fa newp
+should be set to NULL and
+.Fa newlen
+set to 0.
+.Pp
+The
+.Fn sysctlnametomib
+function accepts an ASCII representation of the name,
+looks up the integer name vector,
+and returns the numeric representation in the mib array pointed to by
+.Fa mibp .
+The number of elements in the mib array is given by the location specified by
+.Fa sizep
+before the call,
+and that location gives the number of entries copied after a successful call.
+The resulting
+.Fa mib
+and
+.Fa size
+may be used in subsequent
+.Fn sysctl
+calls to get the data associated with the requested ASCII name.
+This interface is intended for use by applications that want to
+repeatedly request the same variable (the
+.Fn sysctl
+function runs in about a third the time as the same request made via the
+.Fn sysctlbyname
+function).
+.Pp
+The top level names are defined with a CTL_ prefix in
+.In sys/sysctl.h ,
+and are as follows.
+The next and subsequent levels down are found in the include files
+listed here, and described in separate sections below.
+.Bl -column CTLXMACHDEPXXX "Next level namesXXXXXX" -offset indent
+.It Sy "Name	Next level names	Description"
+.It "CTL_DEBUG	sys/sysctl.h	Debugging"
+.It "CTL_VFS	sys/mount.h	File system"
+.It "CTL_HW	sys/sysctl.h	Generic CPU, I/O"
+.It "CTL_KERN	sys/sysctl.h	High kernel limits"
+.It "CTL_MACHDEP	sys/sysctl.h	Machine dependent"
+.It "CTL_NET	sys/socket.h	Networking"
+.It "CTL_USER	sys/sysctl.h	User-level"
+.It "CTL_VM	sys/resources.h	Virtual memory (struct loadavg)"
+.El
+.Pp
+For example, the following retrieves the maximum number of processes allowed
+in the system:
+.Pp
+.Bd -literal -offset indent -compact
+int maxproc;
+size_t len = sizeof(maxproc);
+sysctlbyname("kern.maxproc", &maxproc, &len, NULL, 0);
+.Ed
+.Pp
+To retrieve the standard search path for the system utilities:
+.Pp
+.Bd -literal -offset indent -compact
+char *p;
+size_t len;
+sysctlbyname("user.cs_path", NULL, &len, NULL, 0);
+p = malloc(len);
+sysctlbyname("user.cs_path", p, &len, NULL, 0);
+.Ed
+.Ss CTL_VFS
+A distinguished second level name, VFS_GENERIC,
+is used to get general information about all file systems.
+One of its third level identifiers is VFS_MAXTYPENUM
+that gives the highest valid file system type number.
+Its other third level identifier is VFS_CONF that
+returns configuration information about the file system
+type given as a fourth level identifier (see
+.Xr getvfsbyname 3
+as an example of its use).
+The remaining second level identifiers are the
+file system type number returned by a
+.Xr statfs 2
+call or from VFS_CONF.
+The third level identifiers available for each file system
+are given in the header file that defines the mount
+argument structure for that file system.
+.Ss CTL_HW
+The string and integer information available for the CTL_HW level
+is detailed below.
+The changeable column shows whether a process with appropriate
+privilege may change the value.
+.Bl -column "xxxxxxxxxxxxxxxxxxxxxxxxx" "xxxxxxxxxx" -offset indent
+.It Sy "Name	Type	Changeable"
+.It "hw.activecpu	int32_t	no"
+.It "hw.byteorder	int32_t	no"
+.It "hw.cacheconfig	uint64_t[] 	no"
+.It "hw.cachelinesize	int64_t	no"
+.It "hw.cachesize	uint64_t[] 	no"
+.It "hw.cpu64bit_capable	int32_t	no"
+.It "hw.cpufamily	int32_t	no"
+.It "hw.cpufrequency	int64_t	no"
+.It "hw.cpufrequency_max	int64_t	no"
+.It "hw.cpufrequency_min	int64_t	no"
+.It "hw.cpusubtype	int32_t	no"
+.It "hw.cputhreadtype	int32_t	no"
+.It "hw.cputype	int32_t	no"
+.It "hw.l1dcachesize	int64_t	no"
+.It "hw.l1icachesize	int64_t	no"
+.It "hw.l2cachesize	int64_t	no"
+.It "hw.l3cachesize	int64_t	no"
+.It "hw.logicalcpu	int32_t	no"
+.It "hw.logicalcpu_max	int32_t	no"
+.It "hw.machine	char[]	no"
+.It "hw.memsize	int64_t	no"
+.It "hw.model	char[]	no"
+.It "hw.ncpu	int32_t	no"
+.It "hw.packages	int32_t	no"
+.It "hw.pagesize	int64_t	no"
+.It "hw.physicalcpu	int32_t	no"
+.It "hw.physicalcpu_max	int32_t	no"
+.It "hw.tbfrequency	int64_t	no"
+.El
+.Bl -tag -width 6n
+.It Li "hw.byteorder"
+The byte order (4321 or 1234).
+.It Li "hw.model"
+The machine model.
+.It Li "hw.ncpu"
+The number of cpus. This attribute is deprecated and it is recommended that
+.Va "hw.logicalcpu" ,
+.Va "hw.logicalcpu_max" ,
+.Va "hw.physicalcpu" ,
+or
+.Va "hw.physicalcpu_max"
+be used instead.
+.It Li "hw.logicalcpu"
+The number of logical processors available in the current power management mode.
+.It Li "hw.logicalcpu_max"
+The maximum number of logical processors that could be available this boot.
+.It Li "hw.physicalcpu"
+The number of physical processors available in the current power management mode.
+.It Li "hw.physicalcpu_max"
+The maximum number of physical processors that could be available this boot.
+.It Li "hw.pagesize"
+The software page size in bytes.
+.El
+.Ss CTL_KERN
+The string and integer information available for the CTL_KERN level
+is detailed below.
+The changeable column shows whether a process with appropriate
+privilege may change the value.
+The types of data currently available are process information,
+system vnodes, the open file entries, routing table entries,
+virtual memory statistics, load average history, and clock rate
+information.
+.Bl -column "xxxxxxxxxxxxxxxxxxxxxxxxx" "xxxxxxxxxxxxxxxxxxxx" -offset indent
+.It Sy "Name	Type	Changeable"
+.It "kern.argmax	int32_t	no"
+.It "kern.bootargs	char[]	no"
+.It "kern.boottime	struct timeval	no"
+.It "kern.check_openevt	int32_t	yes"
+.It "kern.clockrate	struct clockinfo	no"
+.It "kern.coredump	int32_t	yes"
+.It "kern.corefile	char[]	yes"
+.It "kern.flush_cache_on_write	int32_t	yes"
+.It "kern.hostid	int32_t	yes"
+.It "kern.hostname	char[]	yes"
+.It "kern.job_control	int32_t	no"
+.It "kern.maxfiles	int32_t	yes"
+.It "kern.maxfilesperproc	int32_t	yes"
+.It "kern.maxnbuf	int32_t	yes"
+.It "kern.maxproc	int32_t	yes"
+.It "kern.maxprocperuid	int32_t	yes"
+.It "kern.maxvnodes	int32_t	yes"
+.It "kern.msgbuf	int32_t	yes"
+.It "kern.nbuf	int32_t	no"
+.It "kern.netboot	int32_t	no"
+.It "kern.ngroups	int32_t	no"
+.It "kern.nisdomainname	char[]	yes"
+.It "kern.num_files	int32_t	no"
+.It "kern.num_tasks	int32_t	no"
+.It "kern.num_taskthreads	int32_t	no"
+.It "kern.num_threads	int32_t	no"
+.It "kern.num_vnodes	int32_t	no"
+.It "kern.nx	int32_t	yes"
+.It "kern.osrelease	char[]	no"
+.It "kern.osrevision	int32_t	no"
+.It "kern.ostype	char[]	no"
+.It "kern.osversion	char[]	yes"
+.It "kern.posix1version	int32_t	no"
+.It "kern.procname	char[]	yes"
+.It "kern.safeboot	int32_t	no"
+.It "kern.saved_ids	int32_t	no"
+.It "kern.secure_kernel	int32_t	no"
+.It "kern.securelevel	int32_t	yes"
+.It "kern.singleuser	int32_t	no"
+.It "kern.sleeptime	struct timeval	no"
+.It "kern.slide	int32_t	no"
+.It "kern.stack_depth_max	int32_t	no"
+.It "kern.stack_size	int32_t	no"
+.It "kern.sugid_coredump	int32_t	yes"
+.It "kern.sugid_scripts	int32_t	yes"
+.It "kern.symfile	char[]	no"
+.It "kern.usrstack	int32_t	no"
+.It "kern.usrstack64	int64_t	no"
+.It "kern.uuid	char[]	no"
+.It "kern.version	char[]	no"
+.It "kern.waketime	struct timeval	no"
+.El
+.Bl -tag -width 6n
+.It Li "kern.argmax"
+The maximum bytes of argument to
+.Xr execve 2 .
+.It Li "kern.boottime"
+A
+.Va struct timeval
+structure is returned.
+This structure contains the time that the system was booted.
+.It Li "kern.clockrate"
+A
+.Va struct clockinfo
+structure is returned.
+This structure contains the clock, statistics clock and profiling clock
+frequencies, the number of micro-seconds per hz tick and the skew rate.
+.It Li "kern.hostid"
+Get or set the host id.
+.It Li "kern.hostname"
+Get or set the hostname.
+.It Li "kern.job_control"
+Return 1 if job control is available on this system, otherwise 0.
+.It Li "kern.maxfiles"
+The maximum number of files that may be open in the system.
+.It Li "kern.maxfilesperproc"
+The maximum number of files that may be open for a single process.
+This limit only applies to processes with an effective uid of nonzero
+at the time of the open request.
+Files that have already been opened are not affected if the limit
+or the effective uid is changed.
+.It Li "kern.maxproc"
+The maximum number of concurrent processes the system will allow.
+.It Li "kern.maxprocperuid"
+The maximum number of concurrent processes the system will allow
+for a single effective uid.
+This limit only applies to processes with an effective uid of nonzero
+at the time of a fork request.
+Processes that have already been started are not affected if the limit
+is changed.
+.It Li "kern.maxvnodes"
+The maximum number of vnodes available on the system.
+.It Li "kern.ngroups"
+The maximum number of supplemental groups.
+.It Li "kern.nisdomainname"
+The name of the current YP/NIS domain.
+.It Li "kern.osrelease"
+The system release string.
+.It Li "kern.osrevision"
+The system revision number.
+.It Li "kern.ostype"
+The system type string.
+.It Li "kern.posix1version"
+The version of
+.St -p1003.1
+with which the system
+attempts to comply.
+.It Li "kern.saved_ids"
+Returns 1 if saved set-group and saved set-user ID is available.
+.It Li "kern.securelevel"
+The system security level.
+This level may be raised by processes with appropriate privilege.
+It may not be lowered.
+.It Li "kern.version"
+The system version string.
+.El
+.Ss CTL_MACHDEP
+The set of variables defined is architecture dependent.
+The following variables are defined for the i386 architecture.
+.Bl -column "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" "xxxxxxxxxx" -offset indent
+.It Sy "Name	Type	Changeable"
+.It "machdep.cpu.address_bits.physical	int32_t	no"
+.It "machdep.cpu.address_bits.virtual	int32_t	no"
+.It "machdep.cpu.brand	int32_t	no"
+.It "machdep.cpu.brand_string	char[]	no"
+.It "machdep.cpu.cache.L2_associativity	int32_t	no"
+.It "machdep.cpu.cache.linesize	int32_t	no"
+.It "machdep.cpu.cache.size	int32_t	no"
+.It "machdep.cpu.core_count	int32_t	no"
+.It "machdep.cpu.cores_per_package	int32_t	no"
+.It "machdep.cpu.extfamily	int32_t	no"
+.It "machdep.cpu.extfeature_bits	int64_t	no"
+.It "machdep.cpu.extfeatures	char[]	no"
+.It "machdep.cpu.extmodel	int32_t	no"
+.It "machdep.cpu.family	int32_t	no"
+.It "machdep.cpu.feature_bits	int64_t	no"
+.It "machdep.cpu.features	char[]	no"
+.It "machdep.cpu.leaf7_feature_bits	uint32_t	no"
+.It "machdep.cpu.leaf7_features	char[]	no"
+.It "machdep.cpu.logical_per_package	int32_t	no"
+.It "machdep.cpu.max_basic	uint32_t	no"
+.It "machdep.cpu.max_ext	uint32_t	no"
+.It "machdep.cpu.microcode_version	int32_t	no"
+.It "machdep.cpu.model	int32_t	no"
+.It "machdep.cpu.processor_flag	int32_t	no"
+.It "machdep.cpu.signature	int32_t	no"
+.It "machdep.cpu.stepping	int32_t	no"
+.It "machdep.cpu.thread_count	int32_t	no"
+.It "machdep.cpu.tlb.data.large	int32_t	no"
+.It "machdep.cpu.tlb.data.large_level1	int32_t	no"
+.It "machdep.cpu.tlb.data.small	int32_t	no"
+.It "machdep.cpu.tlb.data.small_level1	int32_t	no"
+.It "machdep.cpu.tlb.inst.large	int32_t	no"
+.It "machdep.cpu.tlb.inst.small	int32_t	no"
+.It "machdep.cpu.tlb.shared	int32_t	no"
+.It "machdep.cpu.ucupdate	int32_t	yes"
+.It "machdep.cpu.vendor	char[]	no"
+.It "machdep.cpu.xsave.extended_state	uint32_t	no"
+.It "machdep.tsc.deep_idle_rebase	uint32_t	yes"
+.It "machdep.tsc.frequency	int64_t	no"
+.It "machdep.tsc.nanotime.generation	uint32_t	no"
+.It "machdep.tsc.nanotime.shift	uint32_t	no"
+.El
+.Ss CTL_NET
+The string and integer information available for the CTL_NET level
+is detailed below.
+The changeable column shows whether a process with appropriate
+privilege may change the value.
+.Bl -column "Second level nameXXXXXX" "routing messagesXXX" -offset indent
+.It Sy "Second level name	Type	Changeable"
+.It "PF_ROUTE	routing messages	no"
+.It "PF_INET	IPv4 values	yes"
+.It "PF_INET6	IPv6 values	yes"
+.El
+.Bl -tag -width 6n
+.It Li PF_ROUTE
+Return the entire routing table or a subset of it.
+The data is returned as a sequence of routing messages (see
+.Xr route 4
+for the header file, format and meaning).
+The length of each message is contained in the message header.
+.Pp
+The third level name is a protocol number, which is currently always 0.
+The fourth level name is an address family, which may be set to 0 to
+select all address families.
+The fifth, sixth, and seventh level names are as follows:
+.Bl -column -offset indent "Fifth level      Sixth level" "Seventh level"
+.It Sy "Fifth level      Sixth level" Ta Sy "Seventh level"
+.It "NET_RT_FLAGS     rtflags" Ta "None"
+.It "NET_RT_DUMP      None" Ta "None or fib number"
+.It "NET_RT_IFLIST    0 or if_index" Ta None
+.It "NET_RT_IFMALIST  0 or if_index" Ta None
+.It "NET_RT_IFLISTL   0 or if_index" Ta None
+.El
+.Pp
+The
+.Dv NET_RT_IFMALIST
+name returns information about multicast group memberships on all interfaces
+if 0 is specified, or for the interface specified by
+.Va if_index .
+.It Li PF_INET
+Get or set various global information about the IPv4
+(Internet Protocol version 4).
+The third level name is the protocol.
+The fourth level name is the variable name.
+The currently defined protocols and names are:
+.Bl -column ProtocolXX VariableXX TypeXX ChangeableXX
+.It Sy "Protocol	Variable	Type	Changeable"
+.It "icmp	bmcastecho	integer	yes"
+.It "icmp	maskrepl	integer	yes"
+.It "ip	forwarding	integer	yes"
+.It "ip	redirect	integer	yes"
+.It "ip	ttl	integer	yes"
+.It "udp	checksum	integer	yes"
+.El
+.Pp
+The variables are as follows:
+.Bl -tag -width 6n
+.It Li icmp.bmcastecho
+Returns 1 if an ICMP echo request to a broadcast or multicast address is
+to be answered.
+.It Li icmp.maskrepl
+Returns 1 if ICMP network mask requests are to be answered.
+.It Li ip.forwarding
+Returns 1 when IP forwarding is enabled for the host,
+meaning that the host is acting as a router.
+.It Li ip.redirect
+Returns 1 when ICMP redirects may be sent by the host.
+This option is ignored unless the host is routing IP packets,
+and should normally be enabled on all systems.
+.It Li ip.ttl
+The maximum time-to-live (hop count) value for an IP packet sourced by
+the system.
+This value applies to normal transport protocols, not to ICMP.
+.It Li udp.checksum
+Returns 1 when UDP checksums are being computed and checked.
+Disabling UDP checksums is strongly discouraged.
+.Pp
+For variables net.inet.*.ipsec, please refer to
+.Xr ipsec 4 .
+.El
+.It Li PF_INET6
+Get or set various global information about the IPv6
+(Internet Protocol version 6).
+The third level name is the protocol.
+The fourth level name is the variable name.
+.Pp
+For variables net.inet6.* please refer to
+.Xr inet6 4 .
+For variables net.inet6.*.ipsec6, please refer to
+.Xr ipsec 4 .
+.El
+.Ss CTL_USER
+The string and integer information available for the CTL_USER level
+is detailed below.
+The changeable column shows whether a process with appropriate
+privilege may change the value.
+.Bl -column "xxxxxxxxxxxxxxxxxxxxxxxxx" "xxxxxxxxxx" -offset indent
+.It Sy "Name	Type	Changeable"
+.It "user.bc_base_max	int32_t	no"
+.It "user.bc_dim_max	int32_t	no"
+.It "user.bc_scale_max	int32_t	no"
+.It "user.bc_string_max	int32_t	no"
+.It "user.coll_weights_max	int32_t	no"
+.It "user.cs_path	char[]	no"
+.It "user.expr_nest_max	int32_t	no"
+.It "user.line_max	int32_t	no"
+.It "user.posix2_c_bind	int32_t	no"
+.It "user.posix2_c_dev	int32_t	no"
+.It "user.posix2_char_term	int32_t	no"
+.It "user.posix2_fort_dev	int32_t	no"
+.It "user.posix2_fort_run	int32_t	no"
+.It "user.posix2_localedef	int32_t	no"
+.It "user.posix2_sw_dev	int32_t	no"
+.It "user.posix2_upe	int32_t	no"
+.It "user.posix2_version	int32_t	no"
+.It "user.re_dup_max	int32_t	no"
+.It "user.stream_max	int32_t	no"
+.It "user.tzname_max	int32_t	no"
+.El
+.Bl -tag -width 6n
+.Pp
+.It Li "user.bc_base_max"
+The maximum ibase/obase values in the
+.Xr bc 1
+utility.
+.It Li "user.bc_dim_max"
+The maximum array size in the
+.Xr bc 1
+utility.
+.It Li "user.bc_scale_max"
+The maximum scale value in the
+.Xr bc 1
+utility.
+.It Li "user.bc_string_max"
+The maximum string length in the
+.Xr bc 1
+utility.
+.It Li "user.coll_weights_max"
+The maximum number of weights that can be assigned to any entry of
+the LC_COLLATE order keyword in the locale definition file.
+.It Li "user.cs_path"
+Return a value for the
+.Ev PATH
+environment variable that finds all the standard utilities.
+.It Li "user.expr_nest_max"
+The maximum number of expressions that can be nested within
+parenthesis by the
+.Xr expr 1
+utility.
+.It Li "user.line_max"
+The maximum length in bytes of a text-processing utility's input
+line.
+.It Li "user.posix2_c_bind"
+Return 1 if the system's C-language development facilities support the
+C-Language Bindings Option, otherwise 0.
+.It Li "user.posix2_c_dev"
+Return 1 if the system supports the C-Language Development Utilities Option,
+otherwise 0.
+.It Li "user.posix2_char_term"
+Return 1 if the system supports at least one terminal type capable of
+all operations described in
+.St -p1003.2 ,
+otherwise 0.
+.It Li "user.posix2_fort_dev"
+Return 1 if the system supports the FORTRAN Development Utilities Option,
+otherwise 0.
+.It Li "user.posix2_fort_run"
+Return 1 if the system supports the FORTRAN Runtime Utilities Option,
+otherwise 0.
+.It Li "user.posix2_localedef"
+Return 1 if the system supports the creation of locales, otherwise 0.
+.It Li "user.posix2_sw_dev"
+Return 1 if the system supports the Software Development Utilities Option,
+otherwise 0.
+.It Li "user.posix2_upe"
+Return 1 if the system supports the User Portability Utilities Option,
+otherwise 0.
+.It Li "user.posix2_version"
+The version of
+.St -p1003.2
+with which the system attempts to comply.
+.It Li "user.re_dup_max"
+The maximum number of repeated occurrences of a regular expression
+permitted when using interval notation.
+.It Li "user.stream_max"
+The minimum maximum number of streams that a process may have open
+at any one time.
+.It Li "user.tzname_max"
+The minimum maximum number of types supported for the name of a
+timezone.
+.El
+.Ss CTL_VM
+The string and integer information available for the CTL_VM level
+is detailed below.
+The changeable column shows whether a process with appropriate
+privilege may change the value.
+.Bl -column "xxxxxxxxxxxxxxxxxxxxxxxxx" "xxxxxxxxxx" -offset indent
+.It Sy "Name	Type	Changeable"
+.It "vm.loadavg	struct loadavg	no"
+.It "vm.swapusage	struct xsw_usage	no"
+.El
+.Pp
+.Bl -tag -width 6n
+.It Li "vm.loadavg"
+Return the load average history.
+The returned data consists of a
+.Va struct loadavg .
+.El
+.Sh RETURN VALUES
+.Rv -std
+.Sh FILES
+.Bl -tag -width <netinet/icmpXvar.h> -compact
+.It In sys/sysctl.h
+definitions for top level identifiers, second level kernel and hardware
+identifiers, and user level identifiers
+.It In sys/socket.h
+definitions for second level network identifiers
+.It In netinet/in.h
+definitions for third level IPv4/IPv6 identifiers and
+fourth level IPv4/v6 identifiers
+.It In netinet/icmp_var.h
+definitions for fourth level ICMP identifiers
+.It In netinet/icmp6.h
+definitions for fourth level ICMPv6 identifiers
+.It In netinet/udp_var.h
+definitions for fourth level UDP identifiers
+.El
+.Sh ERRORS
+The following errors may be reported:
+.Bl -tag -width Er
+.It Bq Er EFAULT
+The buffer
+.Fa name ,
+.Fa oldp ,
+.Fa newp ,
+or length pointer
+.Fa oldlenp
+contains an invalid address.
+.It Bq Er EINVAL
+The
+.Fa name
+array is less than two or greater than CTL_MAXNAME.
+.It Bq Er EINVAL
+A non-null
+.Fa newp
+is given and its specified length in
+.Fa newlen
+is too large or too small.
+.It Bq Er ENOMEM
+The length pointed to by
+.Fa oldlenp
+is too short to hold the requested value.
+.It Bq Er ENOMEM
+The smaller of either the length pointed to by
+.Fa oldlenp
+or the estimated size of the returned data exceeds the
+system limit on locked memory.
+.It Bq Er ENOMEM
+Locking the buffer
+.Fa oldp ,
+or a portion of the buffer if the estimated size of the data
+to be returned is smaller,
+would cause the process to exceed its per-process locked memory limit.
+.It Bq Er ENOTDIR
+The
+.Fa name
+array specifies an intermediate rather than terminal name.
+.It Bq Er EISDIR
+The
+.Fa name
+array specifies a terminal name, but the actual name is not terminal.
+.It Bq Er ENOENT
+The
+.Fa name
+array specifies a value that is unknown.
+.It Bq Er EPERM
+An attempt is made to set a read-only value.
+.It Bq Er EPERM
+A process without appropriate privilege attempts to set a value.
+.El
+.Sh SEE ALSO
+.Xr confstr 3 ,
+.Xr sysconf 3 ,
+.Xr sysctl 8
+.Sh HISTORY
+The
+.Fn sysctl
+function first appeared in
+.Bx 4.4 .