On Tue, Mar 29, 2011 at 7:41 UTC, Martin Burnicki <martin.burni...@meinberg.de> wrote: > Whether addressing of either mode is done by separate driver numbers (which > I still find a good idea in this case, since SHM is a generic driver), or > by a mode number for the existing SHM driver, is a totally different > question.
I'm leaning towards using the existing shared memory layout and protocol for units 0-3, which until relatively recently were the only possibilities, and POSIX named shared memory with new, safer layout and protocol for units 4 and up. gpsd today only provides 0-3. 0 & 1 have root-only permission, while 2 & 3 are world-writable. I'm also tending towards ntpd never creating the POSIX named shared memory nor relying on its presence to configure the clock, but attempting to open it read-only if it's not already on each poll, and close it if there are no updates for a timeout period. Cheers, Dave Hart _______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
