K 10 svn:author V 3 ian K 8 svn:date V 27 2013-02-15T18:30:32.211672Z K 7 svn:log V 296 Add PPS_CANWAIT support for time_pps_fetch(). This adds support for all three blocking modes described in section 3.4.3 of RFC 2783, allowing the caller to retrieve the most recent values without blocking, to block for a specified time, or to block forever. Reviewed by: discussion on hackers@ END