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< IO‎ | B‎ | Filesystem(Redirected from IO/B/Filesystem)
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Streams returned by .open are defined by IO/B/Stream/Level1 with the following additional requirements:

  • In binary mode .tell MUST return the location in bytes, not an OpaqueCookie.
  • Programs using streams opened by .open in text mode MUST expect .tell to return an OpaqueCookie rather than a position in characters.
    • Actual implementations may use whichever works best for their implementation
    • This requirement is made so that


  • autoflush "wf" support for .open so that every .write will .flush right after