Re: [HEADSUP] naming of tty devices.

From: Ruslan Ermilov (ru_at_freebsd.org)
Date: 09/20/04

  • Next message: Poul-Henning Kamp: "Re: [HEADSUP] naming of tty devices." 
    Date: Mon, 20 Sep 2004 11:59:08 +0300
To: Poul-Henning Kamp <phk@phk.freebsd.dk>

    On Mon, Sep 20, 2004 at 09:38:45AM +0200, Poul-Henning Kamp wrote:
    > My suggestion is the following:
    >
    > All drivers will offer "tty${something}" devices, and
    > generally ${something} will consist of a letter followed
    > by a number, possibly in base 36 ([0-9a-z]).
    >
    > All drivers which attach to external equipment via a serial
    > connector should also offer "cua${thesamething}". "Embedded"
    > serial ports, pseudo drivers etc, do not have to offer the
    > "cua" if DCD state on open is not an issue.
    >
    > The init and lock devices will be called ${base_device}.[init,lock]
    > and they will possibly be provided by on-demand devices so that
    > they do not clutter up /dev.
    >
    > This results in the following major compatibility issues:
    >
    > sio's cuaa* gets renamed to cuad*
    >
    > sio's {tty,cua}[il]%d gets renamed to {tty,cua}%d.{init,lock}
    >
    But we now have cuaa0, cuaia0, cuala0, ttyd0, ttyid0, and ttyld0.
    So, shouldn't the above line be instead:

            sio's tty[il]d%d gets renamed to ttyd%d.{init,lock}
            sio's cua[il]a%d gets renamed to cuad%d.{init,lock}

    You didn't make it clear what ${base_device} should look like, but I'm
    sure you meant that will it include the driver's "letter". This way
    we'll have: ttyd0, ttyd0.init, ttyd0.lock, cuad0, cuad0.init, cuad0.lock.

    > Well-argued protests or researched alternatives before friday please.
    >
    If this will be done in both RELENG_5 and HEAD, I suggest to have
    backward compatibility symlinks under /dev (in RELENG_5 only). I
    don't know how hard it would be to implement this, just an idea.

    Cheers, 

    -- 
Ruslan Ermilov
ru@FreeBSD.org
FreeBSD committer

  • Next message: Poul-Henning Kamp: "Re: [HEADSUP] naming of tty devices."