Re: [HEADSUP] naming of tty devices.

From: Vladimir Grebenschikov (vova_at_fbsd.ru)
Date: 09/20/04

  • Next message: Valentin Nechayev: "Re: [HEADSUP] naming of tty devices." 
    To: Poul-Henning Kamp <phk@phk.freebsd.dk>
Date: Mon, 20 Sep 2004 18:25:35 +0400

    В пн, 20/09/2004 в 15:51 +0200, Poul-Henning Kamp пишет:
    > In message <414EDF66.8030907@cronyx.ru>, Roman Kurakin writes:
    >
    > >>> Why not to add some general device enumeration for all devices,
    > >>>especially
    > >>>if devices would behave the same?
    > >>>
    > >>>tty%{global_port}
    > >>>cua%{global_port}
    > >>
    > >>This doesn't work.
    > >>
    > >>There _are_ differences between serial devices and for instance
    > >>PTYs or NMDM devices have very particular semantics.
    > >>
    > >but all tty devices have some generic abilities and behaviour, right?
    > >(Sorry, I am a bit sio-centric, I didn't ever look inside ptys.)
    >
    > Yes, and those generic abilities is why I want systematic naming.
    >
    > But a global numbering gives you no way to know that tty234 is a PTY
    > and tty235 is a USB device.

    As da3 do not give you any hint is it SCSI disk, USB connected memory
    card or firewire-connected DV-Camera.

    I am not vote for uniform ttys numbering, just notice about similar
    subsystem.

    Actual another problem - ttys should be allocated from userland as
    minimum tty/pty (in contrary with disks).

    One of possible solutions - different dev name-spaces
    /dev/tty/ZXX - for generic ttys (all other ttys mapped there too)
    /dev/pty/XX - for pseudo-ttys
    /dev/sio/XX - for former ttydX
    /dev/cua/XX - for former cuaaX
    /dev/nmdm/XX - for null-modem
    /dev/con/XX - for console
    etc...

    But this layout broke any possible compatibility and will only confuse
    userland (what name should be considered as primary ?)

    I like pkh@ idea if there still way to list all available tty devices in
    system. (sysctl or dev entry/directory) 

    -- 
Vladimir B. Grebenchikov
vova@fbsd.ru
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  • Next message: Valentin Nechayev: "Re: [HEADSUP] naming of tty devices."