Merge pull request #104 from SIPp/osx_monotonic

OSX fixes (the lack of CLOCK_MONOTONIC)

Reported by: dmpanch
Tested by: Ben Klang, Stexxen

src/time.cpp

@@ -39,6 +39,10 @@
 #include <time.h>
 #include <sys/time.h>
 #include <unistd.h>
+#ifdef __MACH__
+#include <mach/clock.h>
+#include <mach/mach.h>
+#endif
 #include "time.hpp"
 #include "sipp.hpp"
 #define MICROSECONDS_PER_SECOND 1000000LL
@@ -53,10 +57,21 @@ unsigned long long getmicroseconds()
     unsigned long long microseconds;
     static unsigned long long start_time = 0;
 
+#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(), SYSTEM_CLOCK, &cclock);
+    clock_get_time(cclock, &mts);
+    mach_port_deallocate(mach_task_self(), cclock);
+    time.tv_sec = mts.tv_sec;
+    time.tv_nsec = mts.tv_nsec;
+#else
 #if defined(CLOCK_MONOTONIC_COARSE)
     clock_gettime(CLOCK_MONOTONIC_COARSE, &time);
 #else
     clock_gettime(CLOCK_MONOTONIC, &time);
+#endif
 #endif
     microseconds = (MICROSECONDS_PER_SECOND * time.tv_sec) + (time.tv_nsec / NANOSECONDS_PER_MICROSECOND);
     if (start_time == 0) {