Add a static clock_gettime() substitute for OS X.

1 files changed, 33 insertions, 0 deletions

diff --git a/src/utils.c b/src/utils.c
index ceb65e1..67860b3 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -30,6 +30,9 @@
 #include <stdarg.h>
 #include <time.h>
 #include <sys/time.h>
+#ifdef __APPLE__
+#include <mach/mach_time.h>
+#endif
 
 #include "utils.h"
 
@@ -299,6 +302,36 @@ int plist_write_to_filename(plist_t plist, const char *filename, enum plist_form
         return 1;
 }
 
+#ifdef __APPLE__
+typedef int clockid_t;
+#define CLOCK_MONOTONIC 1
+
+static int clock_gettime(clockid_t clk_id, struct timespec *ts)
+{
+        // See http://developer.apple.com/library/mac/qa/qa1398
+
+        uint64_t mach_time, nano_sec;
+
+        static mach_timebase_info_data_t base_info;
+
+        mach_time = mach_absolute_time();
+
+        if (base_info.denom == 0) {
+                (void) mach_timebase_info(&base_info);
+        }
+
+        if (base_info.numer == 1 && base_info.denom == 1)
+                nano_sec = mach_time;
+        else
+                nano_sec = mach_time * base_info.numer / base_info.denom;
+
+        ts->tv_sec = nano_sec / 1000000000;
+        ts->tv_nsec = nano_sec % 1000000000;
+
+        return 0;
+}
+#endif
+
 void get_tick_count(struct timeval * tv)
 {
         struct timespec ts;