org.aoju.bus.health.software.linux

Class LinuxOS

java.lang.Object

org.aoju.bus.health.software.AbstractOS

org.aoju.bus.health.software.linux.LinuxOS

All Implemented Interfaces:

OperatingSystem

public class LinuxOS
extends AbstractOS

LinuxOperatingSystem class.

Since:

JDK 1.8+

Version:

5.6.5

Author:

Kimi Liu

Nested Class Summary

Nested classes/interfaces inherited from class org.aoju.bus.health.software.AbstractOS

AbstractOS.FamilyVersionInfo

Nested classes/interfaces inherited from interface org.aoju.bus.health.software.OperatingSystem

OperatingSystem.OSVersionInfo, OperatingSystem.ProcessSort

Constructor Summary

Constructors

Constructor and Description
LinuxOS() Constructor for LinuxOperatingSystem.

Method Summary

Modifier and Type	Method and Description
OSProcess[]	getChildProcesses(int parentPid, int limit, OperatingSystem.ProcessSort sort) Gets currently running child processes of provided PID.
FileSystem	getFileSystem() Instantiates a FileSystem object.
static long	getHz() Gets Jiffies per second, useful for converting ticks to milliseconds and vice versa.
NetworkParams	getNetworkParams() Instantiates a NetworkParams object.
OSProcess	getProcess(int pid, boolean slowFields) Gets information on a currently running process
long	getProcessAffinityMask(int processId) Retrieves the process affinity mask for the specified process.
int	getProcessCount() Get the number of processes currently running
OSProcess[]	getProcesses(int limit, OperatingSystem.ProcessSort sort, boolean slowFields) Gets currently running processes.
int	getProcessId() Gets the current process ID
protected static String	getReleaseFilename() Looks for a collection of possible distrib-release filenames
OSService[]	getServices() Gets the all services on the system.
long	getSystemBootTime() Get Unix time of boot.
long	getSystemUptime() Get the System up time (time since boot).
int	getThreadCount() Get the number of threads currently running
protected int	queryBitness(int jvmBitness) Backup OS-specific query to determine bitness if previous checks fail
protected boolean	queryElevated()
AbstractOS.FamilyVersionInfo	queryFamilyVersionInfo()
String	queryManufacturer()

Methods inherited from class org.aoju.bus.health.software.AbstractOS

getBitness, getFamily, getManufacturer, getProcess, getProcesses, getProcesses, getProcesses, getProcesses, getVersionInfo, isElevated, processSort, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

LinuxOS

public LinuxOS()

Constructor for LinuxOperatingSystem.

Method Detail

getReleaseFilename

protected static String getReleaseFilename()

Looks for a collection of possible distrib-release filenames

Returns:

The first valid matching filename

getHz

public static long getHz()

Gets Jiffies per second, useful for converting ticks to milliseconds and vice versa.

Returns:

Jiffies per second.

queryManufacturer

public String queryManufacturer()

Specified by:

queryManufacturer in class AbstractOS

queryFamilyVersionInfo

public AbstractOS.FamilyVersionInfo queryFamilyVersionInfo()

Specified by:

queryFamilyVersionInfo in class AbstractOS

queryBitness

protected int queryBitness(int jvmBitness)

Description copied from class: AbstractOS

Backup OS-specific query to determine bitness if previous checks fail

Specified by:

queryBitness in class AbstractOS

Parameters:

jvmBitness - The bitness of the JVM

Returns:

The operating system bitness

queryElevated

protected boolean queryElevated()

Specified by:

queryElevated in class AbstractOS

getFileSystem

public FileSystem getFileSystem()

Description copied from interface: OperatingSystem

Instantiates a FileSystem object.

Returns:

A FileSystem object.

getProcesses

public OSProcess[] getProcesses(int limit,
                                OperatingSystem.ProcessSort sort,
                                boolean slowFields)

Description copied from interface: OperatingSystem

Gets currently running processes. If a positive limit is specified, returns only that number of processes; zero will return all processes. The order may be specified by the sort parameter, for example, to return the top cpu or memory consuming processes; if null, no order is guaranteed.

Parameters:

limit - Max number of results to return, or 0 to return all results

sort - If not null, determines sorting of results

slowFields - If false, skip OSProcess fields that are slow to retrieve (e.g., group information on Windows, open files on Unix and Linux). If true, include all fields, regardless of how long it takes to retrieve the data.

Returns:

An array of OSProcess objects for the specified number (or all) of currently running processes, sorted as specified. The array may contain null elements if a process terminates during iteration.

getProcess

public OSProcess getProcess(int pid,
                            boolean slowFields)

Description copied from interface: OperatingSystem

Gets information on a currently running process

Parameters:

pid - A process ID

slowFields - If false, skip OSProcess fields that are slow to retrieve (e.g., group information on Windows, open files on Unix and Linux). If true, include all fields, regardless of how long it takes to retrieve the data.

Returns:

An OSProcess object for the specified process id if it is running; null otherwise

getChildProcesses

public OSProcess[] getChildProcesses(int parentPid,
                                     int limit,
                                     OperatingSystem.ProcessSort sort)

Description copied from interface: OperatingSystem

Gets currently running child processes of provided PID. If a positive limit is specified, returns only that number of processes; zero will return all processes. The order may be specified by the sort parameter, for example, to return the top cpu or memory consuming processes; if null, no order is guaranteed.

Parameters:

parentPid - A process ID

limit - Max number of results to return, or 0 to return all results

sort - If not null, determines sorting of results

Returns:

An array of OSProcess objects presenting the specified number (or all) of currently running child processes of the provided PID, sorted as specified. The array may contain null elements if a process terminates during iteration.

getProcessAffinityMask

public long getProcessAffinityMask(int processId)

Description copied from interface: OperatingSystem

Retrieves the process affinity mask for the specified process.

On Windows systems with more than 64 processors, if the threads of the calling process are in a single processor group, returns the process affinity mask for that group (which may be zero if the specified process is running in a different group). If the calling process contains threads in multiple groups, returns zero.

If the Operating System fails to retrieve an affinity mask (e.g., the process has terminated), returns zero.

Parameters:

processId - The process ID for which to retrieve the affinity.

Returns:

a bit vector in which each bit represents the processors that a process is allowed to run on.

getProcessId

public int getProcessId()

Description copied from interface: OperatingSystem

Gets the current process ID

Returns:

the Process ID of the current process

getProcessCount

public int getProcessCount()

Description copied from interface: OperatingSystem

Get the number of processes currently running

Returns:

The number of processes running

getThreadCount

public int getThreadCount()

Description copied from interface: OperatingSystem

Get the number of threads currently running

Returns:

The number of threads running

getSystemUptime

public long getSystemUptime()

Description copied from interface: OperatingSystem

Get the System up time (time since boot).

Returns:

Number of seconds since boot.

getSystemBootTime

public long getSystemBootTime()

Description copied from interface: OperatingSystem

Get Unix time of boot.

Returns:

The approximate time at which the system booted, in seconds since the Unix epoch.

getNetworkParams

public NetworkParams getNetworkParams()

Description copied from interface: OperatingSystem

Instantiates a NetworkParams object.

Returns:

A NetworkParams object.

getServices

public OSService[] getServices()

Description copied from interface: OperatingSystem

Gets the all services on the system. The definition of what is a service is platform-dependent.

Specified by:

getServices in interface OperatingSystem

Overrides:

getServices in class AbstractOS

Returns:

An array of OSService objects