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kstat2_map_set_tree_cb(3kstat2)
Kernel Statistics Library Functions, Version 2
kstat2_map_set_tree_cb(3KSTAT2)
NAME
kstat2_map_set_tree_cb, kstat2_map_set_data_cb,
kstat2_map_set_destroy_cb - kstat2 tree mutation callbacks
SYNOPSIS
cc [ flag... ] file... -lkstat2 [ library...]
#include <kstat2.h>
kstat2_status_t kstat2_map_set_tree_cb(kstat2_map_t map,
kstat2_tree_cb_t callback);
kstat2_status_t kstat2_map_set_data_cb(kstat2_map_t map,
kstat2_data_cb_t callback);
kstat2_status_t kstat2_map_set_destroy_cb(kstat2_map_t map,
kstat2_map_cb_t callback);
DESCRIPTION
kstat2_map_set_tree_cb() establishes a callback function that will be
called whenever a kstat2 map is added or removed to the tree below the
specified map. The callback must conform to the following typedef:
typedef void (*kstat2_tree_cb_t)(kstat2_map_t map,
kstat2_map_t sub_map, kstat2_tree_cb_event_t event);
The callback will be passed the map it was registered against and the
sub-map that has just been created or is about to be destroyed. To
remove the callback, a callback parameter of NULL can be passed to
kstat2_map_set_tree_cb(). The third parameter identifies the operation
as an addition or a deletion event:
typedef enum kstat2_tree_cb_event {
KSTAT2_TREE_ADD = 0,
KSTAT2_TREE_REM = 1
} kstat2_tree_cb_event_t;
This callback may only access the user data and sub-map items in any
map, see the descriptions of KSTAT2_NVK_SYS, KSTAT2_NVK_USR, and
KSTAT2_NVK_MAP in kstat2(3KSTAT2) for details.
kstat2_map_set_data_cb() establishes a callback function that will be
called whenever kernel kstat data is added to or removed from the cur‐
rent map and any map in the tree below it. The callback must conform to
the following typedef:
typedef void (*kstat2_data_cb_t)(kstat2_map_t map,
kstat2_map_t sub_map, kstat2_data_cb_event_t event);
The callback will be passed the map it was registered against and the
sub-map to which kstat data is being added or removed. To remove the
callback, a callback parameter of NULL can be passed to
kstat2_map_set_data_cb().
typedef enum kstat2_data_cb_event {
KSTAT2_DATA_ADD = 0,
KSTAT2_DATA_REM = 1
} kstat2_data_cb_event_t;
If the event parameter is KSTAT2_DATA_ADD, this callback may access all
data items in any map. If the event parameter is KSTAT2_DATA_REM it can
only access user data and sub-map items in any map. See the descrip‐
tions of KSTAT2_NVK_SYS, KSTAT2_NVK_USR, and KSTAT2_NVK_MAP in
kstat2(3KSTAT2) for details.
kstat2_map_set_destroy_cb() establishes a callback that will be called
immediately prior to the deletion of a kstat map. The callback must
conform to the following typedef:
typedef void (*kstat2_map_cb_t)(kstat2_map_t map, void *user_data);
The callback will be passed the map it was registered against and any
user data that has been associated with the map (see
kstat2_map_set_userdata(3KSTAT2)), or NULL if there is no such data. To
remove the callback, a callback parameter of NULL can be passed. This
callback may be used to reclaim any resources associated with a map,
for example, logging filehandles or external structure references.
This callback may only access the user data and sub-map items in any
map, see the descriptions of KSTAT2_NVK_SYS, KSTAT2_NVK_USR, and
KSTAT2_NVK_MAP in kstat2(3KSTAT2) for details.
The ordering of callbacks over the lifecycle of a map will be:
KSTAT2_TREE_ADD tree callback
KSTAT2_DATA_ADD data callback
KSTAT2_DATA_REM data callback and destroy callback
NOTES
All callbacks are made synchronously during kstat2_update() and call‐
backs that take a significant time to execute will stall the execution
of kstat2_update(). Long running processing should therefore be
deferred and performed outside of the callback functions.
RETURN VALUES
On successful completion, the kstat2_map_set_tree_cb(),
kstat2_map_set_data_cb(), and kstat2_map_set_destroy_cb() will return
KSTAT2_S_OK.
ERRORS
The kstat2_map_set_tree_cb(), kstat2_map_set_data_cb(), and
kstat2_map_set_destroy_cb() functions will fail if:
KSTAT2_S_INVAL_ARG the map parameter is NULL
FILES
/dev/kstat kernel statistics driver
/usr/include/kstat2.h header
EXAMPLES
See the kstat2(3KSTAT2) manpage.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelMt-Safe with
exceptions
SEE ALSO
kstat2_close(3KSTAT2), kstat2_close(3KSTAT2), kstat2_map_get(3KSTAT2),
kstat2_map_get_userdata(3KSTAT2), kstat2_map_meta(3KSTAT2),
kstat2_map_parent(3KSTAT2), kstat2_map_put_integer(3KSTAT2),
kstat2_map_put_integers(3KSTAT2), kstat2_map_put_string(3KSTAT2),
kstat2_map_put_strings(3KSTAT2), kstat2_map_remove(3KSTAT2),
kstat2_map_set_data_cb(3KSTAT2), kstat2_map_set_destroy_cb(3KSTAT2),
kstat2_map_set_userdata(3KSTAT2), kstat2_map_size(3KSTAT2),
kstat2_map_to_array(3KSTAT2), kstat2_map_uri(3KSTAT2),
kstat2_mapiter_end(3KSTAT2), kstat2_mapiter_hasnext(3KSTAT2),
kstat2_mapiter_next(3KSTAT2), kstat2_mapiter_remove(3KSTAT2),
kstat2_mapiter_start(3KSTAT2), kstat2_mapref_alloc(3KSTAT2),
kstat2_mapref_deref(3KSTAT2), kstat2_mapref_free(3KSTAT2),
kstat2_nv_meta(3KSTAT2), kstat2_open(3KSTAT2), kstat2_sta‐
tus_string(3KSTAT2), kstat2_update(3KSTAT2),
kstat2_uri_decode(3KSTAT2), kstat2_uri_encode(3KSTAT2), libkstat2(3LIB)
NOTES
The kstat2 functions are MT-Safe with the exception that only one
thread may actively use a kstat2_handle_t, or any object obtained
through it, at any one time. Synchronization is required if multiple
threads intend to share a kstat2_handle_t or any object obtained
through it. Synchronization is left to the application.
Oracle Solaris 11.4 06 Dec 2015
kstat2_map_set_tree_cb(3KSTAT2)