Class LinuxOSProcessJNA

java.lang.Object

oshi.software.common.AbstractOSProcess

oshi.software.common.os.linux.LinuxOSProcess

oshi.software.os.linux.LinuxOSProcessJNA

All Implemented Interfaces:

OSProcess

@ThreadSafe
public class LinuxOSProcessJNA
extends LinuxOSProcess

JNA-based Linux OS process. Implements getrlimit and getrusage via JNA.

Nested Class Summary

Nested classes/interfaces inherited from interface OSProcess

OSProcess.State

Constructor Summary

Constructors

Constructor	Description
LinuxOSProcessJNA(int pid, LinuxOperatingSystem os)

Method Summary

Modifier and Type	Method	Description
long	getInvoluntaryContextSwitches()	The number of involuntary context switches the process has made.
long	getVoluntaryContextSwitches()	The number of voluntary context switches the process has made.
protected long	queryRlimitHard()	Queries the hard open file limit for the current process via native getrlimit.
protected long	queryRlimitSoft()	Queries the soft open file limit for the current process via native getrlimit.
boolean	updateAttributes()	Attempts to update process attributes.

Methods inherited from class LinuxOSProcess

getAffinityMask, getArguments, getBitness, getBytesRead, getBytesWritten, getCommandLine, getCurrentWorkingDirectory, getEnvironmentVariables, getGroup, getGroupID, getHardOpenFileLimit, getKernelTime, getMajorFaults, getMinorFaults, getName, getOpenFiles, getOs, getParentProcessID, getPath, getPriority, getPrivateResidentMemory, getProcessOpenFileLimit, getResidentMemory, getSoftOpenFileLimit, getStartTime, getState, getThreadCount, getThreadDetails, getUpTime, getUser, getUserID, getUserTime, getVirtualSize

Methods inherited from class AbstractOSProcess

getProcessCpuLoadBetweenTicks, getProcessCpuLoadCumulative, getProcessID, toString

Methods inherited from class Object

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

Methods inherited from interface OSProcess

getContextSwitches

Constructor Details

LinuxOSProcessJNA

public LinuxOSProcessJNA(int pid,
 LinuxOperatingSystem os)

Method Details

updateAttributes

public boolean updateAttributes()

Description copied from interface: OSProcess

Attempts to update process attributes. Returns false if the update fails, which will occur if the process no longer exists.

Specified by:

updateAttributes in interface OSProcess

Overrides:

updateAttributes in class LinuxOSProcess

Returns:

true if the update was successful, false if the update failed. In addition, on a failed update the process state will be changed to OSProcess.State.INVALID.

getVoluntaryContextSwitches

public long getVoluntaryContextSwitches()

Description copied from interface: OSProcess

The number of voluntary context switches the process has made. A voluntary context switch occurs when a process gives up the CPU before its time slice expires (e.g., waiting for I/O).

For the current process, getrusage(RUSAGE_SELF) is used on supported POSIX platforms, which aggregates across all threads. For other processes, platform-specific sources are used (/proc/[pid]/status on Linux, ps on FreeBSD/OpenBSD, /proc/[pid]/usage on Solaris). On macOS, the split is only available for the current process; for other processes this returns 0.

Specified by:

getVoluntaryContextSwitches in interface OSProcess

Overrides:

getVoluntaryContextSwitches in class LinuxOSProcess

Returns:

voluntary context switches if available, 0 otherwise.

getInvoluntaryContextSwitches

public long getInvoluntaryContextSwitches()

Description copied from interface: OSProcess

The number of involuntary context switches the process has made. An involuntary context switch occurs when the scheduler preempts the process (e.g., time slice expired).

For the current process, getrusage(RUSAGE_SELF) is used on supported POSIX platforms, which aggregates across all threads. For other processes, platform-specific sources are used (/proc/[pid]/status on Linux, ps on FreeBSD/OpenBSD, /proc/[pid]/usage on Solaris). On macOS, the split is only available for the current process; for other processes this returns 0.

Specified by:

getInvoluntaryContextSwitches in interface OSProcess

Overrides:

getInvoluntaryContextSwitches in class LinuxOSProcess

Returns:

involuntary context switches if available, 0 otherwise.

queryRlimitSoft

protected long queryRlimitSoft()

Description copied from class: LinuxOSProcess

Queries the soft open file limit for the current process via native getrlimit.

Specified by:

queryRlimitSoft in class LinuxOSProcess

Returns:

the soft limit value

queryRlimitHard

protected long queryRlimitHard()

Description copied from class: LinuxOSProcess

Queries the hard open file limit for the current process via native getrlimit.

Specified by:

queryRlimitHard in class LinuxOSProcess

Returns:

the hard limit value