Timestamp closure.

This checkin adds and documents the necessary configuration and macro magic
to detect and use 64-bit integer divide on Linux kernels.  At least I think
it does.

Author: Eddie Kohler

config-ns.h.in

@@ -12,6 +12,9 @@
 
 #endif /* __cplusplus */
 
+/* The ns driver probably can't use clock_gettime. */
+#define HAVE_USE_CLOCK_GETTIME 0
+
 /* Include userlevel configuration. */
 #define CLICK_USERLEVEL 1
 #include <click/config-userlevel.h>

config-userlevel.h.in

@@ -213,6 +213,13 @@ typedef unsigned long uintptr_t;
 # define HAVE_MULTITHREAD HAVE_USER_MULTITHREAD
 #endif
 
+/* Define HAVE_USE_CLOCK_GETTIME if the clock_gettime function is usable. */
+#ifndef HAVE_USE_CLOCK_GETTIME
+# if HAVE_DECL_CLOCK_GETTIME && HAVE_CLOCK_GETTIME
+#  define HAVE_USE_CLOCK_GETTIME 1
+# endif
+#endif
+
 /* Include assert macro. */
 #include <assert.h>
 
@@ -237,7 +244,8 @@ char *strerror(int errno);
 
 /* Use nanosecond-granularity timestamps if they are enabled. */
 #if HAVE_NANOTIMESTAMP_ENABLED
-# define HAVE_NANOTIMESTAMP 1
+# define TIMESTAMP_NANOSEC 1
+# define HAVE_NANOTIMESTAMP 1	/* Deprecated */
 #endif
 
 #ifdef __cplusplus

doc/Doxyfile

@@ -1044,12 +1044,14 @@ PREDEFINED             = CLICK_DECLS= \
                          CLICK_DEPRECATED= \
                          CLICK_WARN_UNUSED_RESULT= \
                          CLICK_ELEMENT_PORT_COUNT_DEPRECATED= \
+			 CLICK_BYTE_ORDER=4321 \
+			 CLICK_BIG_ENDIAN=4321 \
                          __attribute__(x)= \
                          HAVE_INT64_TYPES \
 			 HAVE_INT64_DIVIDE \
                          HAVE_STRIDE_SCHED \
                          HAVE_STRUCT_TIMESPEC \
-                         HAVE_NANOTIMESTAMP \
+                         TIMESTAMP_NANOSEC \
 			 HAVE_FLOAT_TYPES \
 			 HAVE_IP6 \
 			 HAVE___BUILTIN_CLZ \

elements/analysis/toipflowdumps.cc

@@ -123,7 +123,7 @@ ToIPFlowDumps::Flow::output_binary(StringAccum &sa)
 	    int pos;
 
 	    buf.u[1] = ntohl(_pkt[pi].timestamp.sec());
-#if HAVE_NANOTIMESTAMP
+#if TIMESTAMP_NANOSEC
 	    buf.u[2] = ntohl(_pkt[pi].timestamp.nsec());
 #else
 	    buf.u[2] = ntohl(_pkt[pi].timestamp.usec());
@@ -198,7 +198,7 @@ ToIPFlowDumps::Flow::output(ErrorHandler *errh)
 	   << (_ip_p == IP_PROTO_TCP ? 'T' : 'U')
 	   << "\n!aggregate " << _aggregate << '\n';
 
-#if HAVE_NANOTIMESTAMP
+#if TIMESTAMP_NANOSEC
 	sa << "!data ntimestamp";
 #else
 	sa << "!data timestamp";

elements/userlevel/fakepcap.hh

@@ -93,7 +93,7 @@ fake_pcap_force_ip(WritablePacket*& p, int dlt)
 inline const Timestamp *
 fake_bpf_timeval::make_timestamp(const fake_bpf_timeval *tv, Timestamp *ts_storage)
 {
-#if TIMESTAMP_REP_BIG_ENDIAN && !HAVE_NANOTIMESTAMP
+#if TIMESTAMP_REP_BIG_ENDIAN && !TIMESTAMP_NANOSEC
     (void) ts_storage;
     return reinterpret_cast<const Timestamp*>(tv);
 #else