Re: [Libusb-devel] udev craze: need /dev/bus/usb rationale

[Johannes Erdfelt <johannes@erdfelt.com>]

On Mon, Feb 06, 2006, Greg KH <greg@kroah.com> wrote:
> On Mon, Feb 06, 2006 at 03:29:41PM -0800, Johannes Erdfelt wrote:
> > I'm working on implementing inotify support into libusb 1.0 right now.
> 
> Does usbfs support inotify events?  For some reason I didn't think it
> did, but I'm probably wrong...

Well, it looks like it's trying to, but it's broken:

belushi:..otify-utils-0.25% ./inotify_test /proc/bus/usb/002
inotify device fd = 3
/proc/bus/usb/002 WD=1
read = 32
sizeof inotify_event = 16
pevent->len = 16
EVENT ON WD=1
DELETE (file) 0x00000200
FILENAME\x024

read = 32
sizeof inotify_event = 16
pevent->len = 16
EVENT ON WD=1
DELETE (file) 0x00000200
FILENAME\x025

That was an unplug followed by a replug. This was with my test Keyspan
serial device so there was a reset after the firmware was loaded. It
looks like we're only receiving DELETE events, and no CREATE ones.
It works correctly in /dev/bus/usb (which doesn't seem to create a
device node when it loads firmware):

belushi:..otify-utils-0.25% ./inotify_test /dev/bus/usb/2  
inotify device fd = 3
/dev/bus/usb/2 WD=1
read = 32
sizeof inotify_event = 16
pevent->len = 16
EVENT ON WD=1
DELETE (file) 0x00000200
FILENAME&

read = 32
sizeof inotify_event = 16
pevent->len = 16
EVENT ON WD=1
CREATE (file) 0x00000100
FILENAME(

I had planned on using the old method of polling on
/proc/bus/usb/devices for systems we use /proc/bus/usb anyway.

JE



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