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timesync: use last sample as reference timestamp

Previously in ntpserver(), we would only populate ntp->refts if we
were using a utc (-U) time source.  This will instead use the last
source sample appended to the list of Samples, this requires we add
RFMEM to the rfork() in background(), in order to share lastrefts to
ntpserver().

--- a/sys/src/cmd/aux/timesync.c

+++ b/sys/src/cmd/aux/timesync.c

@@ -40,7 +40,7 @@

 vlong mydisp, rootdisp;

 vlong mydelay, rootdelay;

 vlong avgdelay;

-vlong lastutc;

+vlong lastrefts;

 uchar rootid[4];

 char *sysid;

 int myprec;

@@ -490,6 +490,7 @@

 		/* add current sample to list. */

 		*l = s;

 		l = &s->next;

+		lastrefts = s->stime;

 		if(logging)

 			syslog(0, logfile, "δ %lld avgδ %lld hz %lld",

@@ -1093,8 +1094,7 @@

 		gettime(&s, nil, nil);

 		s -= atoll(v[1]);

 	}

-	lastutc = atoll(v[0]) + s;

-	return lastutc;

+	return atoll(v[0]) + s;

 }

 /*

@@ -1173,7 +1173,7 @@

 		ntp->precision = myprec;

 		hnputfp(ntp->rootdelay, rootdelay + mydelay);

 		hnputfp(ntp->rootdisp, rootdisp + mydisp);

-		hnputts(ntp->refts, lastutc);

+		hnputts(ntp->refts, lastrefts);

 		memmove(ntp->origts, ntp->xmitts, sizeof(ntp->origts));

 		hnputts(ntp->recvts, recvts);

 		memmove(ntp->rootid, rootid, sizeof(ntp->rootid));

@@ -1361,7 +1361,7 @@

 		return;

 	if(!debug) 

-		switch(rfork(RFPROC|RFFDG|RFNAMEG|RFNOTEG|RFNOWAIT)){

+		switch(rfork(RFPROC|RFMEM|RFFDG|RFNAMEG|RFNOTEG|RFNOWAIT)){

 		case -1:

 			sysfatal("forking: %r");

 			break;

-- 

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