On Fri, Jun 5, 2009 at 9:00 AM,
<launchd-dev-request@lists.macosforge.org> wrote:
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Today's Topics:
1. Re: Launch daemon 0n-Demand on USB Connection/Write
(Damien Sorresso)
----------------------------------------------------------------------
Message: 1
Date: Thu, 04 Jun 2009 17:00:11 -0700
From: Damien Sorresso <dsorresso@apple.com>
To: Kiran B <Kiran.b@robosoftin.com>
Cc: launchd-dev@lists.macosforge.org
Subject: Re: [launchd-dev] Launch daemon 0n-Demand on USB
Connection/Write
Message-ID: <BF826895-D2AB-4AFD-A763-898CDB189165@apple.com>
Content-Type: text/plain; charset="us-ascii"; Format="flowed";
DelSp="yes"
On Jun 3, 2009, at 12:45 AM, Kiran B wrote:
> Hello,
>
> From the recent posts in "launchd-dev" lists, it is evident that
> launchd does not yet support launching of processes based on USB
> device getting connected.
>
> I have a requirement to launch a daemon whenever a device with
> specific VendorID is connected.
>
> I am OK even if the daemon gets launched for any device getting
> connected via USB. In that case, the daemon shall ensure that it is
> the right device on which it is interested in. In other case it may
> terminate.
For now, you should have a monitor daemon that keeps track of what's
happening with IOKit. When the device you want appears, it asserts
demand for your other daemon by sending a message to a Mach port or
connecting to a socket. Then your other daemon gets launched on demand.
> I am also curious to know whether a daemon can be launched whenever
> the connected device writes any data on the USB port. (Eg: User
> interaction with the device would make the device write on USB).
No. If we do implement hardware event-based notifications, it wouldn't
be quite this granular.
--
Damien Sorresso
BSD Engineering
Apple Inc.
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