Does the HP printer have a HID interface that their software might be
grabbing (some newer print/scan devices have extra buttons implemented
as HID devices)? If so, maybe their software is inadvertently grabbing
your device too?
Dave
On Feb 28, 2005, at 10:47 AM, Raleigh Ledet wrote:
Hi Rob,
I am quite sure the privileges are correct.
a) My driver is typically launched as root. It changes it's id to the
logged in user's id very early in the process. Either way, it should
be the correct ID.
b) My test user is an admin user.
c) I added test code that tries to open the interface on this specific
failure. I have a one second wait interval. I open th device somewhare
around the 4 to 6th try. That's a 4 to 6 second wait. This is not an
acceptable wait period.
d) I don't get the privilege violation on most Macs. This ONLY happens
once I have attached an hp printer and software installed. It still
occurs now that I have detached the printer, removed it from the print
center, and attempted to uninstall the hp software.
e) Safe Boot works fine. Though I was surprised that SafeBoot launched
my driver and the console app which I set as a login item for the
user.
I will install the usb logger to see if I can gather any more data.
-raleigh
On Feb 27, 2005, at 11:46 AM, Rob Yepez wrote:
Hi Raleigh,
The HID Manager will only allow a process to open an interface to a
HID device if either the process is run by an admin user or by the
currently logged in user.
Can you verify your process privileges before you issue an open on
the HID device?
- Rob
On Feb 25, 2005, at 5:17 PM, Raleigh Ledet wrote:
Hello,
I've got a userland driver that tries to seize my HID device.
Normally, this works perfectly. However, I have some users
complaining that when they boot with automatic login turned on, my
driver fails to grab the device. It reports an
kIOReturnNotPrivileged error from the OpenInterface call. My driver
then quits but, oddly enough, if the user double-clicks my driver,
it works just fine.
I finally tracked the problem down to an hp printer. The only way I
can duplicate tis problem was to attach an hp deskjet printer and
install the software that came with it.
It seems that something is going on during boot w/ auto login that
is not letting me seize/open my device from HID. What the heck is
the HP printer software doing that doesn't allow me to open my
device? How do I work around this problem in my driver.
More background:
1) Driver launched via SystemStartupItems
2) On a user login from the current user into the root user, the
driver relaunches itself. Note: We have made extra careful sure that
the initial driver closes all interfaces that it has open before
launching a new copy of itself. (This is done to load the logged-in
user's prefs.)
3) The driver switches to the user's id to run with their privileges
very early in the launch process.
4) The exact call that returns the error is:
kr = (*hDevice122Interface)->open(hDevice122Interface,
kIOHIDOptionsTypeSeizeDevice);
5) Booting into the login window works. Logging in from the login
window works
6) No Kext for my device. Its primary usage page is a HID mouse.
7) iMac G5, Mac OS X 10.3.8 (7U16)
8) Other devices attached:
USB: Apple Extended USB Keyboard, deskjet 5550, Wacom Tablet
Thanks,
raleigh
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