Class LinuxOperatingSystem

java.lang.Object
oshi.software.common.AbstractOperatingSystem
oshi.software.os.linux.LinuxOperatingSystem
All Implemented Interfaces:
OperatingSystem
@ThreadSafe public 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.

  • Field Details

    • LOG

      private static final org.slf4j.Logger LOG

    • OS_RELEASE_LOG

      private static final String OS_RELEASE_LOG
      See Also:

    • LSB_RELEASE_A_LOG

      private static final String LSB_RELEASE_A_LOG
      See Also:

    • LSB_RELEASE_LOG

      private static final String LSB_RELEASE_LOG
      See Also:

    • RELEASE_DELIM

      private static final String RELEASE_DELIM
      See Also:

    • DOUBLE_QUOTES

      private static final String DOUBLE_QUOTES
      See Also:

    • FILENAME_PROPERTIES

      private static final String FILENAME_PROPERTIES
      See Also:

    • HAS_UDEV

      public static final boolean HAS_UDEV
      This static field identifies if the udev library can be loaded.

    • HAS_GETTID

      public static final boolean HAS_GETTID
      This static field identifies if the gettid function is in the c library.

    • HAS_SYSCALL_GETTID

      public static final boolean HAS_SYSCALL_GETTID
      This static field identifies if the syscall for gettid returns sane results.

    • USER_HZ

      private static final long USER_HZ
      Jiffies per second, used for process time counters.

    • PAGE_SIZE

      private static final long PAGE_SIZE

    • OS_NAME

      private static final String OS_NAME
      OS Name for manufacturer

    • BOOTTIME

      static final long BOOTTIME

    • PPID_INDEX

      private static final int[] PPID_INDEX

  • Constructor Details

    • LinuxOperatingSystem

      public 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

    • getFileSystem

      public FileSystem getFileSystem()
      Description copied from interface: OperatingSystem
      Instantiates a FileSystem object.
      Returns:
      A FileSystem object.

    • 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

    • getProcess

      public OSProcess getProcess(int pid)
      Description copied from interface: OperatingSystem
      Gets information on a currently running process
      Parameters:
      pid - A process ID
      Returns:
      An OSProcess object for the specified process id if it is running; null otherwise

    • 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

    • queryProcessList

      private List<OSProcess> queryProcessList(Set<Integer> descendantPids)

    • getParentPidsFromProcFiles

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

    • getParentPidFromProcFile

      private static int getParentPidFromProcFile(int pid)

    • getProcessId

      public int getProcessId()
      Description copied from interface: OperatingSystem
      Gets the current process ID (PID).
      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

    • getThreadId

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

      Thread IDs on macOS are not correlated with any other Operating System output.

      Returns:
      the Thread ID of the current thread if known, 0 otherwise.

    • 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.

    • 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.

    • queryFamilyVersionCodenameFromReleaseFiles

      private static Triplet<String,String,String> queryFamilyVersionCodenameFromReleaseFiles()

    • readOsRelease

      private static Triplet<String,String,String> readOsRelease()
      Attempts to read /etc/os-release
      Returns:
      a triplet with the parsed family, versionID and codeName if file successfully read and NAME= found, null otherwise

    • execLsbRelease

      private static Triplet<String,String,String> execLsbRelease()
      Attempts to execute `lsb_release -a`
      Returns:
      a triplet with the parsed family, versionID and codeName if the command successfully executed and Distributor ID: or Description: found, null otherwise

    • readLsbRelease

      private static Triplet<String,String,String> readLsbRelease()
      Attempts to read /etc/lsb-release
      Returns:
      a triplet with the parsed family, versionID and codeName if file successfully read and and DISTRIB_ID or DISTRIB_DESCRIPTION, null otherwise

    • readDistribRelease

      private static Triplet<String,String,String> readDistribRelease(String filename)
      Attempts to read /etc/distrib-release (for some value of distrib)
      Parameters:
      filename - The /etc/distrib-release file
      Returns:
      a triplet with the parsed family, versionID and codeName if file successfully read and " release " or " VERSION " found, null otherwise

    • parseRelease

      private static Triplet<String,String,String> parseRelease(String line, String splitLine)
      Helper method to parse version description line style
      Parameters:
      line - a String of the form "Distributor release x.x (Codename)"
      splitLine - A regex to split on, e.g. " release "
      Returns:
      a triplet with the parsed family, versionID and codeName

    • getReleaseFilename

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

    • filenameToFamily

      private static String filenameToFamily(String name)
      Converts a portion of a filename (e.g. the 'redhat' in /etc/redhat-release) to a mixed case string representing the family (e.g., Red Hat)
      Parameters:
      name - Stripped version of filename after removing /etc and -release
      Returns:
      Mixed case family

    • 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