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    From
    SubjectRe: [patch] DTR/DSR hardware handshake support for 2.0/2.2/2.4
    Date
    Followup to:  <20000802125634.A260@localhost>
    By author: David Lawyer <dave@lafn.org>
    In newsgroup: linux.dev.kernel
    > >
    > > #define RTSXOFF 0000001 /* Enable RTS hwfc on input */
    > > #define CTSXON 0000002 /* Enable CTS hwfc on output */
    > > #define DTRXOFF 0000004 /* Enable DTR hwfc on input */
    > > #define CDXON 0000010 /* Enable CD hwfc on output */
    > > #define ISXOFF 0000020 /* Enable RTS hwfc on input */
    >
    > Where is "DSR hwfc on output"? This is a serious omission since I
    > think it's more important than CD hwfc.
    >

    Not only that, but RTSXOFF and ISXOFF are documented as the same
    thing.

    I have to admit I rather like the idea of controlling the output bits
    and input bits used for flow control separately and explicitly; it
    even allows the user to implement "hybrid" control when it's not known
    a priority how the target device is to be controlled.

    -hpa
    --
    <hpa@transmeta.com> at work, <hpa@zytor.com> in private!
    "Unix gives you enough rope to shoot yourself in the foot."
    http://www.zytor.com/~hpa/puzzle.txt

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