On Mar 20, 2010, at 9:06 AM, Masao Uebayashi wrote: > On Sun, Mar 21, 2010 at 1:01 AM, Matt Thomas <m...@3am-software.com> wrote: >> I'm talking about <maj, min> to device. How, as a user, do I know what >> actual tty does /dev/ttyXX open? > > If we make tty(4) a device, we can lookup its parent by drvctl(8) > (extend it to return dv_parent).
That is user unfriendly. The name in /dev should tell me enough to know what it is. I should not have to invoke another command to figure that out. > > My question is - is this the only reason why each serial driver has > its own device entry? It is the primary reason. And it's a good reason.