On 04/21/2017 03:01 PM, David Howells wrote: > Michael Kerrisk (man-pages) <mtk.manpages@xxxxxxxxx> wrote: > (3) There's no problem with asking for extra bits, even if the running kernel > does not support them, because the kernel tells you in its response what > fields it actually gave you. It's this piece that I overlooked. Makes sense, of course. Sorry for the noise! Cheers, Michael -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/