nsm: Implement the NetSync Monitor query.

This patch adds a new "NSM" program.  The new code handles only one
outstanding NSM command at a time.  If and when all four event time
stamps have arrived, the code prints the instantaneous estimated
offset without any averaging or smoothing.

Signed-off-by: Richard Cochran <[email protected]>

.gitignore

@@ -2,6 +2,7 @@
 /*.o
 /.version
 /hwstamp_ctl
+/nsm
 /phc2sys
 /pmc
 /ptp4l

makefile

@@ -22,13 +22,13 @@ CC	= $(CROSS_COMPILE)gcc
 VER     = -DVER=$(version)
 CFLAGS	= -Wall $(VER) $(incdefs) $(DEBUG) $(EXTRA_CFLAGS)
 LDLIBS	= -lm -lrt $(EXTRA_LDFLAGS)
-PRG	= ptp4l pmc phc2sys hwstamp_ctl phc_ctl timemaster
+PRG	= ptp4l hwstamp_ctl nsm phc2sys phc_ctl pmc timemaster
 OBJ     = bmc.o clock.o clockadj.o clockcheck.o config.o fault.o \
  filter.o fsm.o hash.o linreg.o mave.o mmedian.o msg.o ntpshm.o nullf.o phc.o \
  pi.o port.o print.o ptp4l.o raw.o rtnl.o servo.o sk.o stats.o tlv.o \
  transport.o tsproc.o udp.o udp6.o uds.o util.o version.o
 
-OBJECTS	= $(OBJ) hwstamp_ctl.o phc2sys.o phc_ctl.o pmc.o pmc_common.o \
+OBJECTS	= $(OBJ) hwstamp_ctl.o nsm.o phc2sys.o phc_ctl.o pmc.o pmc_common.o \
  sysoff.o timemaster.o
 SRC	= $(OBJECTS:.o=.c)
 DEPEND	= $(OBJECTS:.o=.d)
@@ -46,6 +46,9 @@ all: $(PRG)
 
 ptp4l: $(OBJ)
 
+nsm: config.o filter.o hash.o mave.o mmedian.o msg.o nsm.o print.o raw.o \
+ rtnl.o sk.o transport.o tlv.o tsproc.o udp.o udp6.o uds.o util.o version.o
+
 pmc: config.o hash.o msg.o pmc.o pmc_common.o print.o raw.o sk.o tlv.o \
  transport.o udp.o udp6.o uds.o util.o version.o