diff --git a/netapi.h b/netapi.h
index 2bb455e..9a33cdf 100644
--- a/netapi.h
+++ b/netapi.h
@@ -18,10 +18,6 @@
 
 #pragma warning (disable: 4200)
 
-uint64 OsGetMilliseconds();
-void OsGetTimestampTAI64N(uint8 dst[12]);
-void OsInterruptibleSleep(int millis);
-
 union IpAddr {
   sockaddr_in sin;
   sockaddr_in6 sin6;
diff --git a/network_bsd_common.cpp b/network_bsd_common.cpp
index f0a59fa..0d4346f 100644
--- a/network_bsd_common.cpp
+++ b/network_bsd_common.cpp
@@ -249,45 +249,6 @@ done:
 #endif  // defined(OS_LINUX)
 
 
-#if defined(OS_MACOSX)
-static mach_timebase_info_data_t timebase = { 0, 0 };
-static uint64_t                  initclock;
-
-void InitOsxGetMilliseconds() {
-  if (mach_timebase_info(&timebase) != 0)
-    abort();
-  initclock = mach_absolute_time();
-
-  timebase.denom *= 1000000;
-}
-
-uint64 OsGetMilliseconds()
-{
-  uint64_t clock = mach_absolute_time() - initclock;
-  return clock * (uint64_t)timebase.numer / (uint64_t)timebase.denom;
-}
-
-#else  // defined(OS_MACOSX)
-uint64 OsGetMilliseconds() {
-  struct timespec ts;
-  if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0) {
-    //error
-    fprintf(stderr, "clock_gettime failed\n");
-    exit(1);
-  }
-  return (uint64)ts.tv_sec * 1000 + (ts.tv_nsec / 1000000);
-}
-#endif
-
-void OsGetTimestampTAI64N(uint8 dst[12]) {
-  struct timeval tv;
-  gettimeofday(&tv, NULL);
-  uint64 secs_since_epoch = tv.tv_sec + 0x400000000000000a;
-  uint32 nanos = tv.tv_usec * 1000;
-  WriteBE64(dst, secs_since_epoch);
-  WriteBE32(dst + 8, nanos);
-}
-
 void OsInterruptibleSleep(int millis) {
   usleep((useconds_t)millis * 1000);
 }
diff --git a/network_win32.cpp b/network_win32.cpp
index a8c0469..c1fc397 100644
--- a/network_win32.cpp
+++ b/network_win32.cpp
@@ -60,26 +60,6 @@ static bool IsIpv6AddressSet(const void *p) {
   return (ReadLE64(p) | ReadLE64((char*)p + 8)) != 0;
 }
 
-void OsInterruptibleSleep(int millis) {
-  SleepEx(millis, TRUE);
-}
-
-uint64 OsGetMilliseconds() {
-  return GetTickCount64();
-}
-
-void OsGetTimestampTAI64N(uint8 dst[12]) {
-  SYSTEMTIME systime;
-  uint64 file_time_uint64 = 0;
-  GetSystemTime(&systime);
-  SystemTimeToFileTime(&systime, (FILETIME*)&file_time_uint64);
-  uint64 time_since_epoch_100ns = (file_time_uint64 - 116444736000000000);
-  uint64 secs_since_epoch = time_since_epoch_100ns / 10000000 + 0x400000000000000a;
-  uint32 nanos = (uint32)(time_since_epoch_100ns % 10000000) * 100;
-  WriteBE64(dst, secs_since_epoch);
-  WriteBE32(dst + 8, nanos);
-}
-
 extern "C"
 PSLIST_ENTRY __fastcall InterlockedPushListSList(
   IN PSLIST_HEADER ListHead,
diff --git a/util.cpp b/util.cpp
index 2d7fe8e..8c45163 100644
--- a/util.cpp
+++ b/util.cpp
@@ -20,6 +20,7 @@
 #include <vector>
 #include <algorithm>
 #include "tunsafe_types.h"
+#include "tunsafe_endian.h"
 
 static const char kBase64Alphabet[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
 
@@ -410,3 +411,73 @@ bool ParseBase64Key(const char *s, uint8 key[32]) {
   return base64_decode((uint8*)s, strlen(s), key, &size) && size == 32;
 }
 
+
+#if defined(OS_WIN)
+uint64 OsGetMilliseconds() {
+  return GetTickCount64();
+}
+
+void OsGetTimestampTAI64N(uint8 dst[12]) {
+  SYSTEMTIME systime;
+  uint64 file_time_uint64 = 0;
+  GetSystemTime(&systime);
+  SystemTimeToFileTime(&systime, (FILETIME*)&file_time_uint64);
+  uint64 time_since_epoch_100ns = (file_time_uint64 - 116444736000000000);
+  uint64 secs_since_epoch = time_since_epoch_100ns / 10000000 + 0x400000000000000a;
+  uint32 nanos = (uint32)(time_since_epoch_100ns % 10000000) * 100;
+  WriteBE64(dst, secs_since_epoch);
+  WriteBE32(dst + 8, nanos);
+}
+
+void OsInterruptibleSleep(int millis) {
+  SleepEx(millis, TRUE);
+}
+
+#endif  // defined(OS_WIN)
+
+
+#if defined(OS_POSIX)
+
+#if defined(OS_MACOSX)
+static mach_timebase_info_data_t timebase = { 0, 0 };
+static uint64_t                  initclock;
+
+void InitOsxGetMilliseconds() {
+  if (mach_timebase_info(&timebase) != 0)
+    abort();
+  initclock = mach_absolute_time();
+
+  timebase.denom *= 1000000;
+}
+
+uint64 OsGetMilliseconds() {
+  uint64_t clock = mach_absolute_time() - initclock;
+  return clock * (uint64_t)timebase.numer / (uint64_t)timebase.denom;
+}
+
+#else  // defined(OS_MACOSX)
+uint64 OsGetMilliseconds() {
+  struct timespec ts;
+  if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0) {
+    //error
+    fprintf(stderr, "clock_gettime failed\n");
+    exit(1);
+  }
+  return (uint64)ts.tv_sec * 1000 + (ts.tv_nsec / 1000000);
+}
+#endif
+
+void OsGetTimestampTAI64N(uint8 dst[12]) {
+  struct timeval tv;
+  gettimeofday(&tv, NULL);
+  uint64 secs_since_epoch = tv.tv_sec + 0x400000000000000a;
+  uint32 nanos = tv.tv_usec * 1000;
+  WriteBE64(dst, secs_since_epoch);
+  WriteBE32(dst + 8, nanos);
+}
+
+void OsInterruptibleSleep(int millis) {
+  usleep((useconds_t)millis * 1000);
+ }
+
+#endif  // defined(OS_POSIX)
\ No newline at end of file
diff --git a/util.h b/util.h
index 128d376..7eae298 100644
--- a/util.h
+++ b/util.h
@@ -41,4 +41,10 @@ bool ParseConfigKeyValue(char *m, std::vector<std::pair<char *, char*>> *result)
 bool ParseHexString(const char *text, void *data, size_t data_size);
 void PrintHexString(const void *data, size_t data_size, char *result);
 void SplitString(char *s, int separator, std::vector<char*> *components);
-bool ParseBase64Key(const char *s, uint8 key[32]);
\ No newline at end of file
+bool ParseBase64Key(const char *s, uint8 key[32]);
+
+
+uint64 OsGetMilliseconds();
+void InitOsxGetMilliseconds();
+void OsInterruptibleSleep(int millis);
+void OsGetTimestampTAI64N(uint8 dst[12]);