Class LinuxOperatingSystem

java.lang.Object
oshi.software.common.AbstractOperatingSystem
oshi.software.os.linux.LinuxOperatingSystem
All Implemented Interfaces:
OperatingSystem
Direct Known Subclasses:
LinuxOperatingSystemJNA
@ThreadSafe public abstract class LinuxOperatingSystem extends AbstractOperatingSystem
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically packaged in a Linux distribution.

  • Constructor Details

    • LinuxOperatingSystem

      protected LinuxOperatingSystem()

      Constructor for LinuxOperatingSystem.

  • Method Details

    • queryManufacturer

      public String queryManufacturer()
      Specified by:
      queryManufacturer in class AbstractOperatingSystem

    • queryFamilyVersionInfo

      public Pair<String, OperatingSystem.OSVersionInfo> queryFamilyVersionInfo()
      Specified by:
      queryFamilyVersionInfo in class AbstractOperatingSystem

    • queryBitness

      protected int queryBitness(int jvmBitness)
      Description copied from class: AbstractOperatingSystem
      Backup OS-specific query to determine bitness if previous checks fail
      Specified by:
      queryBitness in class AbstractOperatingSystem
      Parameters:
      jvmBitness - The bitness of the JVM
      Returns:
      The operating system bitness

    • getInternetProtocolStats

      public InternetProtocolStats getInternetProtocolStats()
      Description copied from interface: OperatingSystem
      Instantiates a InternetProtocolStats object.
      Returns:
      a InternetProtocolStats object.

    • getSessions

      public List<OSSession> getSessions()
      Description copied from interface: OperatingSystem
      Gets currently logged in users.

      On macOS, Linux, and Unix systems, the default implementation uses native code (see man getutxent) that is not thread safe. OSHI's use of this code is synchronized and may be used in a multi-threaded environment without introducing any additional conflicts. Users should note, however, that other operating system code may access the same native code.

      The Who#queryWho() method produces similar output parsing the output of the Posix-standard who command, and may internally employ reentrant code on some platforms. Users may opt to use this command-line variant by default using the oshi.os.unix.whoCommand configuration property.

      Returns:
      A list of OSSession objects representing logged-in users

    • queryAllProcesses

      public List<OSProcess> queryAllProcesses()
      Specified by:
      queryAllProcesses in class AbstractOperatingSystem

    • queryChildProcesses

      public List<OSProcess> queryChildProcesses(int parentPid)
      Specified by:
      queryChildProcesses in class AbstractOperatingSystem

    • queryDescendantProcesses

      public List<OSProcess> queryDescendantProcesses(int parentPid)
      Specified by:
      queryDescendantProcesses in class AbstractOperatingSystem

    • createOSProcess

      protected abstract OSProcess createOSProcess(int pid)
      Creates a new OSProcess instance for the given PID using the appropriate native implementation.
      Parameters:
      pid - the process ID
      Returns:
      a new OS process instance

    • getParentPidsFromProcFiles

      protected static Map<Integer,Integer> getParentPidsFromProcFiles(File[] pidFiles)

    • getProcessCount

      public int getProcessCount()
      Description copied from interface: OperatingSystem
      Get the number of processes currently running
      Returns:
      The number of processes running

    • getCurrentThread

      public OSThread getCurrentThread()
      Description copied from interface: OperatingSystem
      Makes a best effort to get the current thread. May not be useful in a multithreaded environment. The thread returned may have been short lived and no longer exist.

      On macOS, returns the oldest thread in the calling process.

      Returns:
      the current thread if known; an invalid thread otherwise.

    • 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.

    • getInstalledApplications

      public List<ApplicationInfo> getInstalledApplications()
      Description copied from interface: OperatingSystem
      Retrieves a list of installed applications on the system.

      This method is implemented per OS. If the OS does not support this feature, it returns an empty list.

      Returns:
      A list of installed applications or an empty list if unsupported.

    • getReleaseFilename

      protected static String getReleaseFilename()
      Looks for a collection of possible distrib-release filenames
      Returns:
      The first valid matching filename

    • getServices

      public List<OSService> getServices()
      Description copied from interface: OperatingSystem
      Gets the all services on the system. The definition of what is a service is platform-dependent.
      Returns:
      An array of OSService objects

    • getHz

      public static long getHz()
      Gets Jiffies per second, useful for converting ticks to milliseconds and vice versa.
      Returns:
      Jiffies per second.

    • getPageSize

      public static long getPageSize()
      Gets Page Size, for converting memory stats from pages to bytes
      Returns:
      Page Size