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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" 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 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE. .\" SUCH DAMAGE.
.\" .\"
.\" $FreeBSD$ .\" $FreeBSD$
.\" .\"
.Dd June 1, 2018 .Dd February 25, 2019
.Dt SYSCTL 9 .Dt SYSCTL 9
.Os .Os
.Sh NAME .Sh NAME
.Nm SYSCTL_DECL , .Nm SYSCTL_DECL ,
.Nm SYSCTL_ADD_BOOL ,
.Nm SYSCTL_ADD_COUNTER_U64 ,
.Nm SYSCTL_ADD_COUNTER_U64_ARRAY ,
.Nm SYSCTL_ADD_INT , .Nm SYSCTL_ADD_INT ,
.Nm SYSCTL_ADD_LONG , .Nm SYSCTL_ADD_LONG ,
.Nm SYSCTL_ADD_NODE , .Nm SYSCTL_ADD_NODE ,
.Nm SYSCTL_ADD_NODE_WITH_LABEL , .Nm SYSCTL_ADD_NODE_WITH_LABEL ,
.Nm SYSCTL_ADD_OPAQUE , .Nm SYSCTL_ADD_OPAQUE ,
.Nm SYSCTL_ADD_PROC , .Nm SYSCTL_ADD_PROC ,
.Nm SYSCTL_ADD_QUAD , .Nm SYSCTL_ADD_QUAD ,
.Nm SYSCTL_ADD_ROOT_NODE , .Nm SYSCTL_ADD_ROOT_NODE ,
.Nm SYSCTL_ADD_S8 , .Nm SYSCTL_ADD_S8 ,
.Nm SYSCTL_ADD_S16 , .Nm SYSCTL_ADD_S16 ,
.Nm SYSCTL_ADD_S32 , .Nm SYSCTL_ADD_S32 ,
.Nm SYSCTL_ADD_S64 , .Nm SYSCTL_ADD_S64 ,
.Nm SYSCTL_ADD_SBINTIME_MSEC ,
.Nm SYSCTL_ADD_SBINTIME_USEC ,
.Nm SYSCTL_ADD_STRING , .Nm SYSCTL_ADD_STRING ,
.Nm SYSCTL_ADD_STRUCT , .Nm SYSCTL_ADD_STRUCT ,
.Nm SYSCTL_ADD_U8 , .Nm SYSCTL_ADD_U8 ,
.Nm SYSCTL_ADD_U16 , .Nm SYSCTL_ADD_U16 ,
.Nm SYSCTL_ADD_U32 , .Nm SYSCTL_ADD_U32 ,
.Nm SYSCTL_ADD_U64 , .Nm SYSCTL_ADD_U64 ,
.Nm SYSCTL_ADD_UAUTO , .Nm SYSCTL_ADD_UAUTO ,
.Nm SYSCTL_ADD_UINT , .Nm SYSCTL_ADD_UINT ,
.Nm SYSCTL_ADD_ULONG , .Nm SYSCTL_ADD_ULONG ,
.Nm SYSCTL_ADD_UQUAD , .Nm SYSCTL_ADD_UQUAD ,
.Nm SYSCTL_ADD_UMA_CUR ,
.Nm SYSCTL_ADD_UMA_MAX ,
.Nm SYSCTL_CHILDREN , .Nm SYSCTL_CHILDREN ,
.Nm SYSCTL_STATIC_CHILDREN , .Nm SYSCTL_STATIC_CHILDREN ,
.Nm SYSCTL_NODE_CHILDREN , .Nm SYSCTL_NODE_CHILDREN ,
.Nm SYSCTL_PARENT , .Nm SYSCTL_PARENT ,
.Nm SYSCTL_BOOL ,
.Nm SYSCTL_COUNTER_U64 ,
.Nm SYSCTL_COUNTER_U64_ARRAY ,
.Nm SYSCTL_INT , .Nm SYSCTL_INT ,
.Nm SYSCTL_INT_WITH_LABEL , .Nm SYSCTL_INT_WITH_LABEL ,
.Nm SYSCTL_LONG , .Nm SYSCTL_LONG ,
.Nm SYSCTL_NODE , .Nm SYSCTL_NODE ,
.Nm SYSCTL_NODE_WITH_LABEL , .Nm SYSCTL_NODE_WITH_LABEL ,
.Nm SYSCTL_OPAQUE , .Nm SYSCTL_OPAQUE ,
.Nm SYSCTL_PROC , .Nm SYSCTL_PROC ,
.Nm SYSCTL_QUAD , .Nm SYSCTL_QUAD ,
.Nm SYSCTL_ROOT_NODE , .Nm SYSCTL_ROOT_NODE ,
.Nm SYSCTL_S8 , .Nm SYSCTL_S8 ,
.Nm SYSCTL_S16 , .Nm SYSCTL_S16 ,
.Nm SYSCTL_S32 , .Nm SYSCTL_S32 ,
.Nm SYSCTL_S64 , .Nm SYSCTL_S64 ,
.Nm SYSCTL_SBINTIME_MSEC ,
.Nm SYSCTL_SBINTIME_USEC ,
.Nm SYSCTL_STRING , .Nm SYSCTL_STRING ,
.Nm SYSCTL_STRUCT , .Nm SYSCTL_STRUCT ,
.Nm SYSCTL_U8 , .Nm SYSCTL_U8 ,
.Nm SYSCTL_U16 , .Nm SYSCTL_U16 ,
.Nm SYSCTL_U32 , .Nm SYSCTL_U32 ,
.Nm SYSCTL_U64 , .Nm SYSCTL_U64 ,
.Nm SYSCTL_UINT , .Nm SYSCTL_UINT ,
.Nm SYSCTL_ULONG , .Nm SYSCTL_ULONG ,
.Nm SYSCTL_UQUAD .Nm SYSCTL_UQUAD ,
.Nm SYSCTL_UMA_CUR ,
.Nm SYSCTL_UMA_MAX
.Nd Dynamic and static sysctl MIB creation functions .Nd Dynamic and static sysctl MIB creation functions
.Sh SYNOPSIS .Sh SYNOPSIS
.In sys/param.h .In sys/param.h
.In sys/sysctl.h .In sys/sysctl.h
.Fn SYSCTL_DECL name .Fn SYSCTL_DECL name
.Ft struct sysctl_oid * .Ft struct sysctl_oid *
.Fo SYSCTL_ADD_BOOL
.Fa "struct sysctl_ctx_list *ctx"
.Fa "struct sysctl_oid_list *parent"
.Fa "int number"
.Fa "const char *name"
.Fa "int ctlflags"
.Fa "bool *ptr"
.Fa "uint8_t val"
.Fa "const char *descr"
.Fc
.Ft struct sysctl_oid *
.Fo SYSCTL_ADD_COUNTER_U64
.Fa "struct sysctl_ctx_list *ctx"
.Fa "struct sysctl_oid_list *parent"
.Fa "int number"
.Fa "const char *name"
.Fa "int ctlflags"
.Fa "counter_u64_t *ptr"
.Fa "const char *descr"
.Fc
.Ft struct sysctl_oid *
.Fo SYSCTL_ADD_COUNTER_U64_ARRAY
.Fa "struct sysctl_ctx_list *ctx"
.Fa "struct sysctl_oid_list *parent"
.Fa "int number"
.Fa "const char *name"
.Fa "int ctlflags"
.Fa "counter_u64_t *ptr"
.Fa "intmax_t len"
.Fa "const char *descr"
.Fc
.Ft struct sysctl_oid *
.Fo SYSCTL_ADD_INT .Fo SYSCTL_ADD_INT
.Fa "struct sysctl_ctx_list *ctx" .Fa "struct sysctl_ctx_list *ctx"
.Fa "struct sysctl_oid_list *parent" .Fa "struct sysctl_oid_list *parent"
.Fa "int number" .Fa "int number"
.Fa "const char *name" .Fa "const char *name"
.Fa "int ctlflags" .Fa "int ctlflags"
.Fa "int *ptr" .Fa "int *ptr"
.Fa "int val" .Fa "int val"
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.Fa "int number" .Fa "int number"
.Fa "const char *name" .Fa "const char *name"
.Fa "int ctlflags" .Fa "int ctlflags"
.Fa "int64_t *ptr" .Fa "int64_t *ptr"
.Fa "int64_t val" .Fa "int64_t val"
.Fa "const char *descr" .Fa "const char *descr"
.Fc .Fc
.Ft struct sysctl_oid * .Ft struct sysctl_oid *
.Fo SYSCTL_ADD_SBINTIME_MSEC
.Fa "struct sysctl_ctx_list *ctx"
.Fa "struct sysctl_oid_list *parent"
.Fa "int number"
.Fa "const char *name"
.Fa "int ctlflags"
.Fa "sbintime_t *ptr"
.Fa "const char *descr"
.Fc
.Ft struct sysctl_oid *
.Fo SYSCTL_ADD_SBINTIME_USEC
.Fa "struct sysctl_ctx_list *ctx"
.Fa "struct sysctl_oid_list *parent"
.Fa "int number"
.Fa "const char *name"
.Fa "int ctlflags"
.Fa "sbintime_t *ptr"
.Fa "const char *descr"
.Fc
.Ft struct sysctl_oid *
.Fo SYSCTL_ADD_STRING .Fo SYSCTL_ADD_STRING
.Fa "struct sysctl_ctx_list *ctx" .Fa "struct sysctl_ctx_list *ctx"
.Fa "struct sysctl_oid_list *parent" .Fa "struct sysctl_oid_list *parent"
.Fa "int number" .Fa "int number"
.Fa "const char *name" .Fa "const char *name"
.Fa "int ctlflags" .Fa "int ctlflags"
.Fa "char *ptr" .Fa "char *ptr"
.Fa "intptr_t len" .Fa "intptr_t len"
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.Fa "struct sysctl_oid_list *parent" .Fa "struct sysctl_oid_list *parent"
.Fa "int number" .Fa "int number"
.Fa "const char *name" .Fa "const char *name"
.Fa "int ctlflags" .Fa "int ctlflags"
.Fa "uint64_t *ptr" .Fa "uint64_t *ptr"
.Fa "const char *descr" .Fa "const char *descr"
.Fc .Fc
.Ft struct sysctl_oid * .Ft struct sysctl_oid *
.Fo SYSCTL_ADD_UMA_CUR
.Fa "struct sysctl_ctx_list *ctx"
.Fa "struct sysctl_oid_list *parent"
.Fa "int number"
.Fa "const char *name"
.Fa "int ctlflags"
.Fa "uma_zone_t ptr"
.Fa "const char *descr"
.Fc
.Ft struct sysctl_oid *
.Fo SYSCTL_ADD_UMA_MAX
.Fa "struct sysctl_ctx_list *ctx"
.Fa "struct sysctl_oid_list *parent"
.Fa "int number"
.Fa "const char *name"
.Fa "int ctlflags"
.Fa "uma_zone_t ptr"
.Fa "const char *descr"
.Fc
.Fa "const char *descr"
.Ft struct sysctl_oid *
.Fo SYSCTL_ADD_UAUTO .Fo SYSCTL_ADD_UAUTO
.Fa "struct sysctl_ctx_list *ctx" .Fa "struct sysctl_ctx_list *ctx"
.Fa "struct sysctl_oid_list *parent" .Fa "struct sysctl_oid_list *parent"
.Fa "int number" .Fa "int number"
.Fa "const char *name" .Fa "const char *name"
.Fa "int ctlflags" .Fa "int ctlflags"
.Fa "void *ptr" .Fa "void *ptr"
.Fa "const char *descr" .Fa "const char *descr"
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.Fo SYSCTL_NODE_CHILDREN .Fo SYSCTL_NODE_CHILDREN
.Fa "parent" .Fa "parent"
.Fa "name" .Fa "name"
.Fc .Fc
.Ft struct sysctl_oid * .Ft struct sysctl_oid *
.Fo SYSCTL_PARENT .Fo SYSCTL_PARENT
.Fa "struct sysctl_oid *oid" .Fa "struct sysctl_oid *oid"
.Fc .Fc
.Fn SYSCTL_BOOL parent number name ctlflags ptr val descr
.Fn SYSCTL_COUNTER_U64 parent number name ctlflags ptr descr
.Fn SYSCTL_COUNTER_U64_ARRAY parent number name ctlflags ptr len descr
.Fn SYSCTL_INT parent number name ctlflags ptr val descr .Fn SYSCTL_INT parent number name ctlflags ptr val descr
.Fn SYSCTL_INT_WITH_LABEL parent number name ctlflags ptr val descr label .Fn SYSCTL_INT_WITH_LABEL parent number name ctlflags ptr val descr label
.Fn SYSCTL_LONG parent number name ctlflags ptr val descr .Fn SYSCTL_LONG parent number name ctlflags ptr val descr
.Fn SYSCTL_NODE parent number name ctlflags handler descr .Fn SYSCTL_NODE parent number name ctlflags handler descr
.Fn SYSCTL_NODE_WITH_LABEL parent number name ctlflags handler descr label .Fn SYSCTL_NODE_WITH_LABEL parent number name ctlflags handler descr label
.Fn SYSCTL_OPAQUE parent number name ctlflags ptr len format descr .Fn SYSCTL_OPAQUE parent number name ctlflags ptr len format descr
.Fn SYSCTL_PROC parent number name ctlflags arg1 arg2 handler format descr .Fn SYSCTL_PROC parent number name ctlflags arg1 arg2 handler format descr
.Fn SYSCTL_QUAD parent number name ctlflags ptr val descr .Fn SYSCTL_QUAD parent number name ctlflags ptr val descr
.Fn SYSCTL_ROOT_NODE number name ctlflags handler descr .Fn SYSCTL_ROOT_NODE number name ctlflags handler descr
.Fn SYSCTL_S8 parent number name ctlflags ptr val descr .Fn SYSCTL_S8 parent number name ctlflags ptr val descr
.Fn SYSCTL_S16 parent number name ctlflags ptr val descr .Fn SYSCTL_S16 parent number name ctlflags ptr val descr
.Fn SYSCTL_S32 parent number name ctlflags ptr val descr .Fn SYSCTL_S32 parent number name ctlflags ptr val descr
.Fn SYSCTL_S64 parent number name ctlflags ptr val descr .Fn SYSCTL_S64 parent number name ctlflags ptr val descr
.Fn SYSCTL_SBINTIME_MSEC parent number name ctlflags ptr descr
.Fn SYSCTL_SBINTIME_USEC parent number name ctlflags ptr descr
.Fn SYSCTL_STRING parent number name ctlflags arg len descr .Fn SYSCTL_STRING parent number name ctlflags arg len descr
.Fn SYSCTL_STRUCT parent number name ctlflags ptr struct_type descr .Fn SYSCTL_STRUCT parent number name ctlflags ptr struct_type descr
.Fn SYSCTL_U8 parent number name ctlflags ptr val descr .Fn SYSCTL_U8 parent number name ctlflags ptr val descr
.Fn SYSCTL_U16 parent number name ctlflags ptr val descr .Fn SYSCTL_U16 parent number name ctlflags ptr val descr
.Fn SYSCTL_U32 parent number name ctlflags ptr val descr .Fn SYSCTL_U32 parent number name ctlflags ptr val descr
.Fn SYSCTL_U64 parent number name ctlflags ptr val descr .Fn SYSCTL_U64 parent number name ctlflags ptr val descr
.Fn SYSCTL_UINT parent number name ctlflags ptr val descr .Fn SYSCTL_UINT parent number name ctlflags ptr val descr
.Fn SYSCTL_ULONG parent number name ctlflags ptr val descr .Fn SYSCTL_ULONG parent number name ctlflags ptr val descr
.Fn SYSCTL_UQUAD parent number name ctlflags ptr val descr .Fn SYSCTL_UQUAD parent number name ctlflags ptr val descr
.Fn SYSCTL_UMA_MAX parent number name ctlflags ptr descr
.Fn SYSCTL_UMA_CUR parent number name ctlflags ptr descr
.Sh DESCRIPTION .Sh DESCRIPTION
The The
.Nm SYSCTL .Nm SYSCTL
kernel interface allows dynamic or static creation of kernel interface allows dynamic or static creation of
.Xr sysctl 8 .Xr sysctl 8
MIB entries. MIB entries.
All static sysctls are automatically destroyed when the module which All static sysctls are automatically destroyed when the module which
they are part of is unloaded. they are part of is unloaded.
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Second callback argument for procedure sysctls. Second callback argument for procedure sysctls.
.It Fa len .It Fa len
The length of the data pointed to by the The length of the data pointed to by the
.Fa ptr .Fa ptr
argument. argument.
For string type OIDs a length of zero means that For string type OIDs a length of zero means that
.Xr strlen 3 .Xr strlen 3
will be used to get the length of the string at each access to the OID. will be used to get the length of the string at each access to the OID.
For array type OIDs the length must be greater than zero.
.It Fa ptr .It Fa ptr
Pointer to sysctl variable or string data. Pointer to sysctl variable or string data.
For sysctl values the pointer can be SYSCTL_NULL_XXX_PTR which means the OID is read-only and the returned value should be taken from the For sysctl values the pointer can be SYSCTL_NULL_XXX_PTR which means the OID is read-only and the returned value should be taken from the
.Fa val .Fa val
argument. argument.
.It Fa val .It Fa val
If the If the
.Fa ptr .Fa ptr
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.Pa handler .Pa handler
function. function.
The handler is responsible for handling all read and write requests to The handler is responsible for handling all read and write requests to
the OID. the OID.
This OID type is especially useful if the kernel data is not easily This OID type is especially useful if the kernel data is not easily
accessible, or needs to be processed before exporting. accessible, or needs to be processed before exporting.
.Sh CREATING A STATIC SYSCTL .Sh CREATING A STATIC SYSCTL
Static sysctls are declared using one of the Static sysctls are declared using one of the
.Fn SYSCTL_BOOL ,
.Fn SYSCTL_COUNTER_U64 ,
.Fn SYSCTL_COUNTER_U64_ARRAY ,
.Fn SYSCTL_INT , .Fn SYSCTL_INT ,
.Fn SYSCTL_INT_WITH_LABEL , .Fn SYSCTL_INT_WITH_LABEL ,
.Fn SYSCTL_LONG , .Fn SYSCTL_LONG ,
.Fn SYSCTL_NODE , .Fn SYSCTL_NODE ,
.Fn SYSCTL_NODE_WITH_LABEL , .Fn SYSCTL_NODE_WITH_LABEL ,
.Fn SYSCTL_OPAQUE , .Fn SYSCTL_OPAQUE ,
.Fn SYSCTL_PROC , .Fn SYSCTL_PROC ,
.Fn SYSCTL_QUAD , .Fn SYSCTL_QUAD ,
.Fn SYSCTL_ROOT_NODE , .Fn SYSCTL_ROOT_NODE ,
.Fn SYSCTL_S8 , .Fn SYSCTL_S8 ,
.Fn SYSCTL_S16 , .Fn SYSCTL_S16 ,
.Fn SYSCTL_S32 , .Fn SYSCTL_S32 ,
.Fn SYSCTL_S64 , .Fn SYSCTL_S64 ,
.Fn SYSCTL_SBINTIME_MSEC ,
.Fn SYSCTL_SBINTIME_USEC ,
.Fn SYSCTL_STRING , .Fn SYSCTL_STRING ,
.Fn SYSCTL_STRUCT , .Fn SYSCTL_STRUCT ,
.Fn SYSCTL_U8 , .Fn SYSCTL_U8 ,
.Fn SYSCTL_U16 , .Fn SYSCTL_U16 ,
.Fn SYSCTL_U32 , .Fn SYSCTL_U32 ,
.Fn SYSCTL_U64 , .Fn SYSCTL_U64 ,
.Fn SYSCTL_UINT , .Fn SYSCTL_UINT ,
.Fn SYSCTL_ULONG .Fn SYSCTL_ULONG ,
.Fn SYSCTL_UQUAD ,
.Fn SYSCTL_UMA_CUR
or or
.Fn SYSCTL_UQUAD .Fn SYSCTL_UMA_MAX
macros. macros.
.Sh CREATING A DYNAMIC SYSCTL .Sh CREATING A DYNAMIC SYSCTL
Dynamic nodes are created using one of the Dynamic nodes are created using one of the
.Fn SYSCTL_ADD_BOOL ,
.Fn SYSCTL_ADD_COUNTER_U64 ,
.Fn SYSCTL_ADD_COUNTER_U64_ARRAY ,
.Fn SYSCTL_ADD_INT , .Fn SYSCTL_ADD_INT ,
.Fn SYSCTL_ADD_LONG , .Fn SYSCTL_ADD_LONG ,
.Fn SYSCTL_ADD_NODE , .Fn SYSCTL_ADD_NODE ,
.Fn SYSCTL_ADD_NODE_WITH_LABEL , .Fn SYSCTL_ADD_NODE_WITH_LABEL ,
.Fn SYSCTL_ADD_OPAQUE , .Fn SYSCTL_ADD_OPAQUE ,
.Fn SYSCTL_ADD_PROC , .Fn SYSCTL_ADD_PROC ,
.Fn SYSCTL_ADD_QUAD , .Fn SYSCTL_ADD_QUAD ,
.Fn SYSCTL_ADD_ROOT_NODE , .Fn SYSCTL_ADD_ROOT_NODE ,
.Fn SYSCTL_ADD_S8 , .Fn SYSCTL_ADD_S8 ,
.Fn SYSCTL_ADD_S16 , .Fn SYSCTL_ADD_S16 ,
.Fn SYSCTL_ADD_S32 , .Fn SYSCTL_ADD_S32 ,
.Fn SYSCTL_ADD_S64 , .Fn SYSCTL_ADD_S64 ,
.Fn SYSCTL_ADD_SBINTIME_MSEC ,
.Fn SYSCTL_ADD_SBINTIME_USEC ,
.Fn SYSCTL_ADD_STRING , .Fn SYSCTL_ADD_STRING ,
.Fn SYSCTL_ADD_STRUCT , .Fn SYSCTL_ADD_STRUCT ,
.Fn SYSCTL_ADD_U8 , .Fn SYSCTL_ADD_U8 ,
.Fn SYSCTL_ADD_U16 , .Fn SYSCTL_ADD_U16 ,
.Fn SYSCTL_ADD_U32 , .Fn SYSCTL_ADD_U32 ,
.Fn SYSCTL_ADD_U64 , .Fn SYSCTL_ADD_U64 ,
.Fn SYSCTL_ADD_UAUTO , .Fn SYSCTL_ADD_UAUTO ,
.Fn SYSCTL_ADD_UINT , .Fn SYSCTL_ADD_UINT ,
.Fn SYSCTL_ADD_ULONG , .Fn SYSCTL_ADD_ULONG ,
.Fn SYSCTL_ADD_UQUAD ,
.Fn SYSCTL_ADD_UMA_CUR
or or
.Fn SYSCTL_UQUAD .Fn SYSCTL_ADD_UMA_MAX
functions. functions.
See See
.Xr sysctl_remove_oid 9 .Xr sysctl_remove_oid 9
or or
.Xr sysctl_ctx_free 9 .Xr sysctl_ctx_free 9
for more information on how to destroy a dynamically created OID. for more information on how to destroy a dynamically created OID.
.Sh CONTROL FLAGS .Sh CONTROL FLAGS
For most of the above functions and macros, declaring a type as part For most of the above functions and macros, declaring a type as part
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