S_IRUSR

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
  1. auto S_IRUSR;
  2. auto S_IRUSR;
  3. auto S_IRUSR;
    version(!linux && !OSX && FreeBSD)
    extern (C) const
    auto S_IRUSR = octal!(400);

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