org.apache.tomcat.jni

## Class OS

- java.lang.Object
- - org.apache.tomcat.jni.OS

-     public class OS
      extends Object

  OS
  Author:
    Mladen Turk

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static boolean` | `IS_BSD`
    `static boolean` | `IS_LINUX`
    `static boolean` | `IS_MACOSX`
    `static boolean` | `IS_NETWARE`
    `static boolean` | `IS_SOLARIS`
    `static boolean` | `IS_UNIX`
    `static boolean` | `IS_WIN32`
    `static boolean` | `IS_WIN64`
    `static int` | `LOG_DEBUG`
    `static int` | `LOG_EMERG`
    `static int` | `LOG_ERROR`
    `static int` | `LOG_INFO`
    `static int` | `LOG_NOTICE`
    `static int` | `LOG_WARN`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `OS()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `static String` | `defaultEncoding(long pool)` Get the name of the system default character set.
    `static String` | `expand(String str)` Expand environment variables.
    `static int` | `info(long[] inf)` Gather system info.
    `static String` | `localeEncoding(long pool)` Get the name of the current locale character set.
    `static int` | `random(byte[] buf, int len)` Generate random bytes.
    `static void` | `syslog(int level, String message)` Log message.
    `static void` | `sysloginit(String domain)` Initialize system logging.

    - ### Methods inherited from class java.lang.Object

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

- - ### Field Detail

    - #### LOG_EMERG

          public static final int LOG_EMERG

      See Also:
        Constant Field Values

    - #### LOG_ERROR

          public static final int LOG_ERROR

      See Also:
        Constant Field Values

    - #### LOG_NOTICE

          public static final int LOG_NOTICE

      See Also:
        Constant Field Values

    - #### LOG_WARN

          public static final int LOG_WARN

      See Also:
        Constant Field Values

    - #### LOG_INFO

          public static final int LOG_INFO

      See Also:
        Constant Field Values

    - #### LOG_DEBUG

          public static final int LOG_DEBUG

      See Also:
        Constant Field Values

    - #### IS_UNIX

          public static final boolean IS_UNIX

    - #### IS_NETWARE

          public static final boolean IS_NETWARE

    - #### IS_WIN32

          public static final boolean IS_WIN32

    - #### IS_WIN64

          public static final boolean IS_WIN64

    - #### IS_LINUX

          public static final boolean IS_LINUX

    - #### IS_SOLARIS

          public static final boolean IS_SOLARIS

    - #### IS_BSD

          public static final boolean IS_BSD

    - #### IS_MACOSX

          public static final boolean IS_MACOSX

  - ### Constructor Detail

    - #### OS

          public OS()

  - ### Method Detail

    - #### defaultEncoding

          public static String defaultEncoding(long pool)

      Get the name of the system default character set.
      Parameters:
        `pool` - the pool to allocate the name from, if needed

    - #### localeEncoding

          public static String localeEncoding(long pool)

      Get the name of the current locale character set. Defers to apr_os_default_encoding if the current locale's data can't be retrieved on this system.
      Parameters:
        `pool` - the pool to allocate the name from, if needed

    - #### random

          public static int random(byte[] buf,
                   int len)

      Generate random bytes.
      Parameters:
        `buf` - Buffer to fill with random bytes
        `len` - Length of buffer in bytes

    - #### info

          public static int info(long[] inf)

      Gather system info.

           On exit the inf array will be filled with:
           inf[0]  - Total usable main memory size
           inf[1]  - Available memory size
           inf[2]  - Total page file/swap space size
           inf[3]  - Page file/swap space still available
           inf[4]  - Amount of shared memory
           inf[5]  - Memory used by buffers
           inf[6]  - Memory Load

           inf[7]  - Idle Time in microseconds
           inf[8]  - Kernel Time in microseconds
           inf[9]  - User Time in microseconds

           inf[10] - Process creation time (apr_time_t)
           inf[11] - Process Kernel Time in microseconds
           inf[12] - Process User Time in microseconds

           inf[13] - Current working set size.
           inf[14] - Peak working set size.
           inf[15] - Number of page faults.

      Parameters:
        `inf` - array that will be filled with system information. Array length must be at least 16.

    - #### expand

          public static String expand(String str)

      Expand environment variables.
      Parameters:
        `str` - String to expand
      Returns:
        Expanded string with replaced environment variables.

    - #### sysloginit

          public static void sysloginit(String domain)

      Initialize system logging.
      Parameters:
        `domain` - String that will be prepended to every message

    - #### syslog

          public static void syslog(int level,
                    String message)

      Log message.
      Parameters:
        `level` - Log message severity. See LOG_XXX enums.
        `message` - Message to log

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