IPC_PRIVATE

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
  1. key_t IPC_PRIVATE;
  2. key_t IPC_PRIVATE;
  3. key_t IPC_PRIVATE;
    version(!linux && !OSX && !FreeBSD && solaris)
    extern (C) const
    key_t IPC_PRIVATE;

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