Package com.sun.jna.platform.linux

# Interface LibRT

All Superinterfaces:
  `Library`

public interface LibRT extends Library
POSIX.1b Realtime Extensions library (librt). Functions in this library provide most of the interfaces specified by the POSIX.1b Realtime Extension.

- ## Nested Class Summary

  ## Nested classes/interfaces inherited from interface com.sun.jna.Library

  `Library.Handler`

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final LibRT`
  `INSTANCE`

  ### Fields inherited from interface com.sun.jna.Library

  `OPTION_ALLOW_OBJECTS, OPTION_CALLING_CONVENTION, OPTION_CLASSLOADER, OPTION_FUNCTION_MAPPER, OPTION_INVOCATION_MAPPER, OPTION_OPEN_FLAGS, OPTION_STRING_ENCODING, OPTION_STRUCTURE_ALIGNMENT, OPTION_SYMBOL_PROVIDER, OPTION_TYPE_MAPPER`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `int`
  `shm_open(String name, int oflag, int mode)`
  Creates and opens a new, or opens an existing, POSIX shared memory object.
  `int`
  `shm_unlink(String name)`
  Removes an object previously created by `shm_open(java.lang.String, int, int)`.

- ## Field Details

  - ### INSTANCE

    static final LibRT INSTANCE

- ## Method Details

  - ### shm_open

    int shm_open(String name, int oflag, int mode)
    Creates and opens a new, or opens an existing, POSIX shared memory object. A POSIX shared memory object is in effect a handle which can be used by unrelated processes to `mmap()` the same region of shared memory.
    Parameters:
      `name` - The shared memory object to be created or opened. For portable use, a shared memory object should be identified by a name of the form `/somename` that is, a null-terminated string of up to `NAME_MAX` (i.e., 255) characters consisting of an initial slash, followed by one or more characters, none of which are slashes.
      `oflag` - A bit mask created by ORing together exactly one of `O_RDONLY` or `O_RDWR` and any of the other flags `O_CREAT`, `O_EXCL`, or `O_TRUNC`.
      `mode` - When `oflag` includes `O_CREAT`, the object's permission bits are set according to the low-order 9 bits of mode, except that those bits set in the process file mode creation mask (see `umask(2)`) are cleared for the new object.
    Returns:
      On success, returns a file descriptor (a nonnegative integer). On failure, returns -1. On failure, `errno` is set to indicate the cause of the error.

  - ### shm_unlink

    int shm_unlink(String name)
    Removes an object previously created by `shm_open(java.lang.String, int, int)`.
    Parameters:
      `name` - The shared memory object to be unlinked.
    Returns:
      returns 0 on success, or -1 on error. On failure, `errno` is set to indicate the cause of the error.