Subject: Incompatibilities between <=3.0 & current: USB_DEVICEINFO ioctl
To: None <firstname.lastname@example.org>
From: Stephan Thesing <email@example.com>
Date: 03/19/2006 21:21:31
[ sorry if this has been discussed before, a quick search of the mailinglist
archive didn't give any results... ]
it seems that the binary compatibility between <=3.0 and -current is broken
w.r.t. the usb(4) USB_DEVICEINFO ioctl.
In revision 1.72 of sys/dev/usb/usb.h the udi_product, udi_vendor and
udi_serial members of struct usb_device_info were changed.
Previously, they were arrays for USB_MAX_STRING_LEN chars, now they are
arrays for USB_MAX_ENCODED_STRING_LEN (==3*USB_MAX_STRING_LEN) to hold
encoded UTF8 strings.
I.e. sizeof(struct usb_device_info) changed between <=3.0 and current and now a
3.0 binary (e.g. using devel/libusb from pkgsrc) will get EINVAL for the ioctl
USB_DEVICEINFO under -current.
As a struct usb_device_info is part in the union usb_event, this should also
affect compatibility for the event interface via poll/read.
Is this accepted behavior and I should just live with having to compile a
libusb under -current (which fixed my problem for digikam) or should a compat
ioctl be added to -current in order to mimic the old behavior?
(It will be difficult to mimic the right behavior for reads of events...)
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