On Thu, Apr 14, 2005 at 01:25:32PM -0500, Nathan Lynch wrote: > On Thu, 2005-04-14 at 08:48 -0700, Mark Wong wrote: > > On Tue, Feb 15, 2005 at 03:09:00PM -0600, Nathan Lynch wrote: > > > > > 5) offlining the last running cpu in the system :) > > > > > > > > Just because I'm mostly ignorant, what's the correct behavior? For > > > > example, the atttriute to offline goes away, is not changeable, etc. > > > > Easy to test definitely. :) > > > > > > The write to /sys/devices/system/cpu/cpuX/online should return EBUSY. > > > > Hi Nathan, > > > > I just got around to trying this and I figure I'm doing it wrong. > > Capturing the return ($?) from echo is either a 0 or 1, which makes > > sense, so I figure I'm not capturing the correct thing to see if EBUSY > > is returned. How do I do that? > > The echo shell builtin doesn't return the specific error > code... /bin/echo gives more detail on stderr, but it also exits with > return code 1 on any error. > > # /bin/echo 0 > /sys/devices/system/cpu/cpu5/online > /bin/echo: write error: Device or resource busy This was my mistake. I wasn't paying attention to echo vs /bin/echo. I see this now. Mark.
