add clock_gettime for macos 10.11 and earlier

1 files changed, 26 insertions, 0 deletions

diff --git a/apps/openssl/compat/clock_gettime_osx.c b/apps/openssl/compat/clock_gettime_osx.c
new file mode 100644
index 0000000..e0a5f59
--- /dev/null
+++ b/apps/openssl/compat/clock_gettime_osx.c
@@ -0,0 +1,26 @@
+#include <time.h>
+
+#include <mach/mach_time.h>
+#define ORWL_NANO (+1.0E-9)
+#define ORWL_GIGA UINT64_C(1000000000)
+
+int
+clock_gettime(clock_id_t clock_id, struct timespec *tp)
+{
+        static double orwl_timebase = 0.0;
+        static uint64_t orwl_timestart = 0;
+
+        if (!orwl_timestart) {
+                mach_timebase_info_data_t tb = { 0 };
+                mach_timebase_info(&tb);
+                orwl_timebase = tb.numer;
+                orwl_timebase /= tb.denom;
+                orwl_timestart = mach_absolute_time();
+        }
+
+        double diff = (mach_absolute_time() - orwl_timestart) * orwl_timebase;
+        tp->tv_sec = diff * ORWL_NANO;
+        tp->tv_nsec = diff - (tp->tv_sec * ORWL_GIGA);
+
+        return 0;
+}