diff --git a/include/os/os.h b/include/os/os.h
index d96f7efb51..f020af5a65 100644
--- a/include/os/os.h
+++ b/include/os/os.h
@@ -13,8 +13,8 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef TDENGINE_OS_H
-#define TDENGINE_OS_H
+#ifndef _TD_OS_H_
+#define _TD_OS_H_
 
 #ifdef __cplusplus
 extern "C" {
@@ -82,4 +82,4 @@ void osInit();
 }
 #endif
 
-#endif
+#endif /*_TD_OS_H_*/
diff --git a/include/os/osFile.h b/include/os/osFile.h
index cedf26d04a..3ff3b50550 100644
--- a/include/os/osFile.h
+++ b/include/os/osFile.h
@@ -16,12 +16,12 @@
 #ifndef _TD_OS_FILE_H_
 #define _TD_OS_FILE_H_
 
+#include "osSocket.h"
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-#include "osSocket.h"
-
 #ifndef ALLOW_FORBID_FUNC
     #define open OPEN_FUNC_TAOS_FORBID
     #define fopen FOPEN_FUNC_TAOS_FORBID
diff --git a/include/os/osMemory.h b/include/os/osMemory.h
index 5f1d5a9a8a..6100419035 100644
--- a/include/os/osMemory.h
+++ b/include/os/osMemory.h
@@ -20,12 +20,12 @@
 extern "C" {
 #endif
 
-#define tfree(x)       \
-  do {                 \
-    if (x) {           \
+#define tfree(x)         \
+  do {                   \
+    if (x) {             \
       free((void *)(x)); \
       (x) = 0;           \
-    }                  \
+    }                    \
   } while (0)
 
 #ifdef __cplusplus
diff --git a/include/os/osSemaphore.h b/include/os/osSemaphore.h
index 78112fc7a0..7fb9a2202d 100644
--- a/include/os/osSemaphore.h
+++ b/include/os/osSemaphore.h
@@ -16,12 +16,12 @@
 #ifndef _TD_OS_SEMPHONE_H_
 #define _TD_OS_SEMPHONE_H_
 
+#include <semaphore.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-#include <semaphore.h>
-
 #if defined (_TD_DARWIN_64)
   typedef struct tsem_s *tsem_t;
   int tsem_init(tsem_t *sem, int pshared, unsigned int value);
diff --git a/include/os/osSocket.h b/include/os/osSocket.h
index af99e4b474..395874a88c 100644
--- a/include/os/osSocket.h
+++ b/include/os/osSocket.h
@@ -16,10 +16,6 @@
 #ifndef _TD_OS_SOCKET_H_
 #define _TD_OS_SOCKET_H_
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 #if defined(_TD_WINDOWS_64) || defined(_TD_WINDOWS_32)
   #include "winsock2.h"
   #include <WS2tcpip.h>
@@ -30,6 +26,10 @@ extern "C" {
   #include <sys/epoll.h>
 #endif
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define TAOS_EPOLL_WAIT_TIME 500
 typedef int32_t SOCKET;
 typedef SOCKET  EpollFd;
diff --git a/include/os/osSysinfo.h b/include/os/osSysinfo.h
index 9f9061d243..a0771dc734 100644
--- a/include/os/osSysinfo.h
+++ b/include/os/osSysinfo.h
@@ -16,12 +16,12 @@
 #ifndef _TD_OS_SYSINFO_H_
 #define _TD_OS_SYSINFO_H_
 
+#include "os.h"
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-#include "os.h"
-
 typedef struct {
   int64_t total;
   int64_t used;
diff --git a/include/os/osThread.h b/include/os/osThread.h
index 79834dc9a5..cccc13755d 100644
--- a/include/os/osThread.h
+++ b/include/os/osThread.h
@@ -16,12 +16,12 @@
 #ifndef _TD_OS_THREAD_H_
 #define _TD_OS_THREAD_H_
 
+#include <pthread.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-#include <pthread.h>
-
 #ifdef __cplusplus
 }
 #endif