Where should devctl notifications be sent from?

From: Nik Clayton (nik_at_freebsd.org)
Date: 03/27/04

  • Next message: Cyrille Lefevre: "Re: posix ps (was Re: Adding `pgrep' and `pkill' to /usr/bin)" 
    Date: Sat, 27 Mar 2004 08:55:37 +0000
To: arch@freebsd.org

    Apologies in advance if this is too trivial for -arch.

    I'm trying to work out where it's appropriate to add devctl
    notifications.

    The specific problem I'm trying to solve involves an iPod connected
    through firewire. I'd like to be able to have devd be notified when the
    iPod arrives, so that various processes can kick off automatically. In
    an ideal world, I'll drop the iPod in the dock, and some backup
    processes start, thereby allowing me to justify the purchase of a model
    several sizes larger than I actually need :-)

    It looks like there are several places where the devctl_queue_data() and
    related calls could be placed:

        firewire(4) -- when the device is plugged in
        fwohci(4) -- when the interface arrives
        sbp(4) -- when it's recognised as a mass storage device
        geom(4) -- when geom creates the device (/dev/da2 (and da2s2) in my
                   case). Robert Watson has a patch that implements this.
        devfs -- specifically, in make_dev(9) and destroy_dev(9)

    The limited research that I've done suggests that the most generic place
    to put this code is inside make_dev(9) and destroy_dev(9). But this
    seems so trivial that I can't believe no one else hasn't done the work,
    so I figure there's probably something important that I'm missing.

    N 

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  • Next message: Cyrille Lefevre: "Re: posix ps (was Re: Adding `pgrep' and `pkill' to /usr/bin)"

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