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List:       kde-devel
Subject:    Re: KDE2 and Linux 2.4
From:       James Tappin <sjt () star ! sr ! bham ! ac ! uk>
Date:       2001-02-07 17:19:16
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On Wednesday 07 February 2001 15:40, Adriaan de Groot wrote:
> On Wed, 7 Feb 2001, Navindra Umanee wrote:
> > Does KDE2 still have problems running with Linux 2.4?  According to
> > this article, this seems to be the case:
>
> Well, this isn't a KDE2-as-a-whole problem but my personal corner of KDE2
> - KPilot - has serious issues with kernel 2.4. And since you've brought it
> up I'll describe my problem here and solicit solutions from kde-devel as a
> whole:
>
> Kernel 2.4 makes USB device nodes (in /dev/udb/ I think) on-the-fly. One
> part of KPilot is a daemon process that sits and waits for input on a
> device. Up til now you could set it to wait on /dev/usb0 and all would be
> fine. Except under kernel 2.4, there *is* no /dev/usb/0 until the input is
> there, so KPilot can't possibly wait on /dev/usb/0 before it exists.
>
> Are there any ideas about what to do about this? [I suppose some kind of
> Dir-Watcher might work...]

I'm probably going in way out of my depth here as I've never used a Pilot or 
2.4, but I have had a fair bit of experience with usbdevfs (under 2.2.18) 
with gphoto. 

There is a user-land library called libusb (http://libusb.sourceforge.net) 
which allows you to access devices, and it can I think look for devices 
appearing by vendor and product id.

Permissions under 2.4 should be handled by hotplug (under 2.2 I wrote a small 
daemon to do the job (http://www.xena.uklinux.net/Linux/usb_perms.html)).

Probably a red herring but might be useful.

James

-- 
+------------------------+-------------------------------+---------+
| James Tappin           | School of Physics & Astronomy |  O__    |
| sjt@star.sr.bham.ac.uk | University of Birmingham      | --  \/` |
| Ph: 0121-414-6462. Fax: 0121-414-3722                  |         |
+--------------------------------------------------------+---------+
 
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