From: Sergei Trofimovich <slyfox@xxxxxxxxxx> Date: Fri, 29 May 2020 10:40:19 +0100 > Question time: > > 1. Why is sparc32 special? Does it have something to do with > compatibility to other OSes of that time? (Solaris? BSD?) > > fs/fcntl.c has kernel handling: > /* required for strict SunOS emulation */ > if (O_NONBLOCK != O_NDELAY) > if (arg & O_NDELAY) > arg |= O_NONBLOCK; > but why does it leak to to userspace header definition? > > I think it should not. The original sparc value was meant to match the SunOS value exactly in order to make the SunOS emulation support easier. The current situation is a mess and I don't doubt that it accounts for various kinds of weird behavior we've seen over the years :-/
