otoolep · June 17, 2014 22:00 · Jul 17, 2011
diff --git a/current_utc_time.c b/current_utc_time.c
@@ -0,0 +1,43 @@
+/* 
+author: jbenet
+os x, compile with: gcc -o testo test.c 
+linux, compile with: gcc -o testo test.c -lrt
+*/
+
+#include <time.h>
+#include <sys/time.h>
+#include <stdio.h>
+
+#ifdef __MACH__
+#include <mach/clock.h>
+#include <mach/mach.h>
+#endif
+
+
+void current_utc_time(struct timespec *ts) {
+
+#ifdef __MACH__ // OS X does not have clock_gettime, use clock_get_time
+  clock_serv_t cclock;
+  mach_timespec_t mts;
+  host_get_clock_service(mach_host_self(), CALENDAR_CLOCK, &cclock);
+  clock_get_time(cclock, &mts);
+  mach_port_deallocate(mach_task_self(), cclock);
+  ts->tv_sec = mts.tv_sec;
+  ts->tv_nsec = mts.tv_nsec;
+#else
+  clock_gettime(CLOCK_REALTIME, ts);
+#endif
+
+}
+
+
+int main(int argc, char **argv) {
+
+  struct timespec ts;
+  current_utc_time(&ts);
+
+  printf("s:  %lu\n", ts.tv_sec);
+  printf("ns: %lu\n", ts.tv_nsec);
+  return 0;
+
+}
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