Am 04.02.23 um 16:19 schrieb Warner Losh: [...]
The ioctl handler in kbd/kbd.c has been extended in the same way as had been used to support 32 bit key codes in the main key map (with similar backwards compatibility code).Support of kbdcontrol built with the patched kbio.h on an old kernel could be added to kbdcontrol.c - but we do not support running a new user land on an old kernel, in general. (The old kbdcontrol on a new kernel could load the normal keymap, but the dead key map would be ignored.) "In general" is true. However, this case is on the edge of being one that we should do, based on how hard it is. You run into needing this if you boot an old kernel because the new kernel is broken on your hardware, but you've already done an install world (this happens, even for people that follow the rules sometimes for problems that aren't fatal to boot, but may be too crashy to build a new kernel). Since this affects one's ability to interact with the system with non-standard keyboards, how hard would it be to retain the old code as a fallback if the new ioctl fails to work? If it's quite hard, then we can skip it. If it isn't too hard, please consider it... Also, what's the behavior of the failure?
I have created review D38388 (https://reviews.freebsd.org/D38388) to make kbdcontrol fall back to the old ioctl() invocation when executed on an old kernel. Without this patch, kbdcontrol can load the "normal" key codes when run on an old kernel, but the dead key table will not be loaded or displayed (i.e. accented characters defined in the dead key table will not be accessible on the console). I'd appreciate approval of the patches, and would apply D38381 first and D38388 on top to allow it to be reverted after a grace period (of a length to be determined). I have tested all combinations of the kernel and userland patches and verified correct results. But it may already be too late to get these patches into 13-STABLE before 13.2 is tagged. These patches fix an issue that affects some people (with accented characters above 255). The keymaps with dead key combinations that generate character codes above 255 are: centraleuropean.kbd centraleuropean.qwerty.kbd cz.kbd fr.bepo.kbd gr.101.acc.kbd gr.elot.acc.kbd gr.kbd sk.kbd Regards, STefan
