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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Raleigh Ledet email@hidden
Wacom Technology Corp. Towards the Harmonious
Mac Software Engineer Development Between
Human and Computer.
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