com.sun.jna.platform.unix.solaris

Interface LibKstat

All Superinterfaces:

Library

public interface LibKstat
extends Library

Kstat library. The kstat facility is a general-purpose mechanism for providing kernel statistics to users.

Author:

widdis[at]gmail[dot]com

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	LibKstat.Kstat The kernel maintains a linked list of statistics structures, or kstats.
static class	LibKstat.KstatCtl A kstat control structure.
static class	LibKstat.KstatIntr Interrupt statistics.
static class	LibKstat.KstatIO IO Statistics.
static class	LibKstat.KstatNamed A list of arbitrary name=value statistics.
static class	LibKstat.KstatTimer Event timer statistics.

Nested classes/interfaces inherited from interface com.sun.jna.Library

Library.Handler

Field Summary

Fields

Modifier and Type	Field and Description
static int	EAGAIN
static LibKstat	INSTANCE
static byte	KSTAT_DATA_CHAR
static byte	KSTAT_DATA_INT32
static byte	KSTAT_DATA_INT64
static byte	KSTAT_DATA_STRING
static byte	KSTAT_DATA_UINT32
static byte	KSTAT_DATA_UINT64
static int	KSTAT_INTR_HARD
static int	KSTAT_INTR_MULTSVC
static int	KSTAT_INTR_SOFT
static int	KSTAT_INTR_SPURIOUS
static int	KSTAT_INTR_WATCHDOG
static int	KSTAT_NUM_INTRS
static int	KSTAT_STRLEN
static byte	KSTAT_TYPE_INTR
static byte	KSTAT_TYPE_IO
static byte	KSTAT_TYPE_NAMED
static byte	KSTAT_TYPE_RAW
static byte	KSTAT_TYPE_TIMER

Fields inherited from interface com.sun.jna.Library

OPTION_ALLOW_OBJECTS, OPTION_CALLING_CONVENTION, OPTION_CLASSLOADER, OPTION_FUNCTION_MAPPER, OPTION_INVOCATION_MAPPER, OPTION_OPEN_FLAGS, OPTION_STRING_ENCODING, OPTION_STRUCTURE_ALIGNMENT, OPTION_TYPE_MAPPER

Method Summary

Modifier and Type	Method and Description
int	kstat_chain_update(LibKstat.KstatCtl kc) The kstat_chain_update() function brings the user's kstat header chain in sync with that of the kernel.
int	kstat_close(LibKstat.KstatCtl kc) The kstat_close() function frees all resources that were associated with kc.
Pointer	kstat_data_lookup(LibKstat.Kstat ksp, java.lang.String name) The kstat_data_lookup() function searches the kstat's data section for the record with the specified name .
LibKstat.Kstat	kstat_lookup(LibKstat.KstatCtl kc, java.lang.String ks_module, int ks_instance, java.lang.String ks_name) The kstat_lookup() function traverses the kstat chain, kc.kc_chain, searching for a kstat with the same ks_module, ks_instance, and ks_name fields; this triplet uniquely identifies a kstat.
LibKstat.KstatCtl	kstat_open() The kstat_open() function initializes a kstat control structure, which provides access to the kernel statistics library.
int	kstat_read(LibKstat.KstatCtl kc, LibKstat.Kstat ksp, Pointer p) kstat_read() gets data from the kernel for the kstat pointed to by ksp.
int	kstat_write(LibKstat.KstatCtl kc, LibKstat.Kstat ksp, Pointer buf) kstat_write() writes data from buf, or from ksp.ks_data if buf is NULL, to the corresponding kstat in the kernel.

Field Detail

INSTANCE

static final LibKstat INSTANCE

KSTAT_TYPE_RAW

static final byte KSTAT_TYPE_RAW

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Constant Field Values

KSTAT_TYPE_NAMED

static final byte KSTAT_TYPE_NAMED

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KSTAT_TYPE_INTR

static final byte KSTAT_TYPE_INTR

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KSTAT_TYPE_IO

static final byte KSTAT_TYPE_IO

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KSTAT_TYPE_TIMER

static final byte KSTAT_TYPE_TIMER

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Constant Field Values

KSTAT_DATA_CHAR

static final byte KSTAT_DATA_CHAR

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Constant Field Values

KSTAT_DATA_INT32

static final byte KSTAT_DATA_INT32

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Constant Field Values

KSTAT_DATA_UINT32

static final byte KSTAT_DATA_UINT32

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KSTAT_DATA_INT64

static final byte KSTAT_DATA_INT64

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Constant Field Values

KSTAT_DATA_UINT64

static final byte KSTAT_DATA_UINT64

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KSTAT_DATA_STRING

static final byte KSTAT_DATA_STRING

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KSTAT_INTR_HARD

static final int KSTAT_INTR_HARD

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KSTAT_INTR_SOFT

static final int KSTAT_INTR_SOFT

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KSTAT_INTR_WATCHDOG

static final int KSTAT_INTR_WATCHDOG

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KSTAT_INTR_SPURIOUS

static final int KSTAT_INTR_SPURIOUS

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KSTAT_INTR_MULTSVC

static final int KSTAT_INTR_MULTSVC

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KSTAT_NUM_INTRS

static final int KSTAT_NUM_INTRS

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KSTAT_STRLEN

static final int KSTAT_STRLEN

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Constant Field Values

EAGAIN

static final int EAGAIN

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Constant Field Values

Method Detail

kstat_open

LibKstat.KstatCtl kstat_open()

The kstat_open() function initializes a kstat control structure, which provides access to the kernel statistics library.

Returns:

A pointer to this structure, which must be supplied as the kc argument in subsequent libkstat function calls.

kstat_close

int kstat_close(LibKstat.KstatCtl kc)

The kstat_close() function frees all resources that were associated with kc.

Parameters:

kc - a kstat control structure

Returns:

0 on success and -1 on failure.

kstat_chain_update

int kstat_chain_update(LibKstat.KstatCtl kc)

The kstat_chain_update() function brings the user's kstat header chain in sync with that of the kernel. The kstat chain is a linked list of kstat headers (kstat_t's) pointed to by kc.kc_chain, which is initialized by kstat_open(3KSTAT). This chain constitutes a list of all kstats currently in the system. During normal operation, the kernel creates new kstats and delete old ones as various device instances are added and removed, thereby causing the user's copy of the kstat chain to become out of date. The kstat_chain_update() function detects this condition by comparing the kernel's current kstat chain ID(KCID), which is incremented every time the kstat chain changes, to the user's KCID, kc.kc_chain_id. If the KCIDs match, kstat_chain_update() does nothing. Otherwise, it deletes any invalid kstat headers from the user's kstat chain, adds any new ones, and sets kc.kc_chain_id to the new KCID. All other kstat headers in the user's kstat chain are unmodified.

Parameters:

kc - a kstat control structure

Returns:

the new KCID if the kstat chain has changed, 0 if it hasn't, or -1 on failure.

kstat_read

int kstat_read(LibKstat.KstatCtl kc,
               LibKstat.Kstat ksp,
               Pointer p)

kstat_read() gets data from the kernel for the kstat pointed to by ksp. ksp.ks_data is automatically allocated (or reallocated) to be large enough to hold all of the data. ksp.ks_ndata is set to the number of data fields, ksp.ks_data_size is set to the total size of the data, and ksp.ks_snaptime is set to the high-resolution time at which the data snapshot was taken.

Parameters:

kc - The kstat control structure

ksp - The kstat from which to retrieve data

p - If buf is non-NULL , the data is copied from ksp.ks_data into buf.

Returns:

On success, return the current kstat chain ID (KCID). On failure, return -1.

kstat_write

int kstat_write(LibKstat.KstatCtl kc,
                LibKstat.Kstat ksp,
                Pointer buf)

kstat_write() writes data from buf, or from ksp.ks_data if buf is NULL, to the corresponding kstat in the kernel. Only the superuser can use kstat_write() .

Parameters:

kc - The kstat control structure

ksp - The kstat on which to set data

buf - If buf is non-NULL, the data is copied from buf into ksp.ks_data.

Returns:

On success, return the current kstat chain ID (KCID). On failure, return -1.

kstat_lookup

LibKstat.Kstat kstat_lookup(LibKstat.KstatCtl kc,
                            java.lang.String ks_module,
                            int ks_instance,
                            java.lang.String ks_name)

The kstat_lookup() function traverses the kstat chain, kc.kc_chain, searching for a kstat with the same ks_module, ks_instance, and ks_name fields; this triplet uniquely identifies a kstat. If ks_module is NULL, ks_instance is -1, or ks_name is NULL, then those fields will be ignored in the search. For example, kstat_lookup(kc, NULL, -1, "foo") will simply find the first kstat with name "foo".

Parameters:

kc - The kstat control structure

ks_module - The kstat module to search

ks_instance - The kstat instance number

ks_name - The kstat name to search

Returns:

a pointer to the requested kstat if it is found, or NULL if it is not.

kstat_data_lookup

Pointer kstat_data_lookup(LibKstat.Kstat ksp,
                          java.lang.String name)

The kstat_data_lookup() function searches the kstat's data section for the record with the specified name . This operation is valid only for kstat types which have named data records. Currently, only the KSTAT_TYPE_NAMED and KSTAT_TYPE_TIMER kstats have named data records.

Parameters:

ksp - The kstat to search

name - The key for the name-value pair, or name of the timer as applicable

Returns:

a pointer to the requested data record if it is found. If the requested record is not found, or if the kstat type is invalid, returns NULL.