diff --git a/common/include/input_hub.cpp b/common/include/input_hub.cpp
index 41bbac7f5ef58ee386b633c80a213c52b3c0abef..afa54a58f5d2858f004ad65a65873ad321ec4255 100644
--- a/common/include/input_hub.cpp
+++ b/common/include/input_hub.cpp
@@ -449,7 +449,7 @@ int32_t InputHub::OpenInputDeviceLocked(const std::string& devicePath)
     std::unique_lock<std::mutex> my_lock(operationMutex_);
     DHLOGI("Opening device: %s", devicePath.c_str());
     int fd = OpenInputDeviceFdByPath(devicePath);
-    if (fd == -1) {
+    if (fd == UN_INIT_FD_VALUE) {
         DHLOGE("The fd open failed, devicePath %s.", devicePath.c_str());
         return ERR_DH_INPUT_HUB_OPEN_DEVICEPATH_FAIL;
     }
@@ -476,7 +476,7 @@ int32_t InputHub::OpenInputDeviceLocked(const std::string& devicePath)
 
 int32_t InputHub::QueryInputDeviceInfo(int fd, InputDevice& identifier)
 {
-    char buffer[256] = {0};
+    char buffer[INPUT_EVENT_BUFFER_SIZE] = {0};
     // Get device name.
     if (ioctl(fd, EVIOCGNAME(sizeof(buffer) - 1), &buffer) < 1) {
         DHLOGE(
@@ -1279,7 +1279,7 @@ void InputHub::Device::Close()
 {
     if (fd >= 0) {
         ::close(fd);
-        fd = -1;
+        fd = UN_INIT_FD_VALUE;
     }
 }
 
diff --git a/services/source/inputinject/include/distributed_input_inject.h b/services/source/inputinject/include/distributed_input_inject.h
index 68d556e5f8d20d200d02b575737eb47c15d180c0..bf286005df48b0307df4ae4a96808b828093ed82 100644
--- a/services/source/inputinject/include/distributed_input_inject.h
+++ b/services/source/inputinject/include/distributed_input_inject.h
@@ -33,7 +33,6 @@ public:
     static DistributedInputInject &GetInstance();
     int32_t RegisterDistributedHardware(const std::string& devId, const std::string& dhId,
         const std::string& parameters);
-
     int32_t UnregisterDistributedHardware(const std::string& devId, const std::string& dhId);
     int32_t RegisterDistributedEvent(RawEvent* buffer, size_t bufferSize);
     int32_t StructTransJson(const InputDevice& pBuf, std::string& strDescriptor);
@@ -45,22 +44,18 @@ public:
         const uint32_t sourcePhyWidth, const uint32_t sourcePhyHeight);
     int32_t RemoveVirtualTouchScreenNode(const std::string& dhId);
     int32_t GetVirtualTouchScreenFd();
-
     int32_t RegisterInputNodeListener(sptr<InputNodeListener> listener);
     int32_t UnregisterInputNodeListener(sptr<InputNodeListener> listener);
-
     int32_t GetDhIdsByInputType(const std::string &devId, const uint32_t &inputTypes, std::vector<std::string> &dhIds);
 
+    void NotifyNodeMgrScanVirNode(const std::string &dhId);
     void InputDeviceEventInject(const std::shared_ptr<RawEvent> &rawEvent);
+    void SyncNodeOfflineInfo(const std::string &srcDevId, const std::string &sinkDevId, const std::string &sinkNodeId);
     void SyncNodeOnlineInfo(const std::string &srcDevId, const std::string &sinkDevId, const std::string &sinkNodeId,
         const std::string &sinkNodeDesc);
-    void SyncNodeOfflineInfo(const std::string &srcDevId, const std::string &sinkDevId, const std::string &sinkNodeId);
-
     void GetVirtualKeyboardPathsByDhIds(const std::vector<std::string> &dhIds,
         std::vector<std::string> &shareDhidsPaths, std::vector<std::string> &shareDhIds);
 
-    void NotifyNodeMgrScanVirNode(const std::string &dhId);
-
 private:
     DistributedInputInject();
     ~DistributedInputInject();
diff --git a/services/source/inputinject/src/distributed_input_node_manager.cpp b/services/source/inputinject/src/distributed_input_node_manager.cpp
index 041d4de69505fa3a45ae9be7251675796d3609c3..2c4c7aa30f51210d9915e22cc43de3cb6234807b 100644
--- a/services/source/inputinject/src/distributed_input_node_manager.cpp
+++ b/services/source/inputinject/src/distributed_input_node_manager.cpp
@@ -193,7 +193,7 @@ void DistributedInputNodeManager::NotifyNodeMgrScanVirNode(const std::string &dh
 
 bool DistributedInputNodeManager::IsVirtualDev(int fd)
 {
-    char buffer[256] = {0};
+    char buffer[INPUT_EVENT_BUFFER_SIZE] = {0};
     std::string deviceName;
     if (ioctl(fd, EVIOCGNAME(sizeof(buffer) - 1), &buffer) < 1) {
         DHLOGE("Could not get device name for %s.", ConvertErrNo().c_str());
@@ -212,7 +212,7 @@ bool DistributedInputNodeManager::IsVirtualDev(int fd)
 
 bool DistributedInputNodeManager::GetDevDhIdByFd(int fd, std::string& dhId, std::string& physicalPath)
 {
-    char buffer[256] = {0};
+    char buffer[INPUT_EVENT_BUFFER_SIZE] = {0};
     if (ioctl(fd, EVIOCGPHYS(sizeof(buffer) - 1), &buffer) < 1) {
         DHLOGE("Could not get device physicalPath for %s.", ConvertErrNo().c_str());
         return false;
@@ -251,7 +251,7 @@ void DistributedInputNodeManager::OpenInputDevice(const std::string& devicePath,
     std::string curDhId;
     std::string physicalPath;
     int fd = OpenInputDeviceFdByPath(devicePath);
-    if (fd == -1) {
+    if (fd == UN_INIT_FD_VALUE) {
         DHLOGE("The fd open failed, devicePath %s.", devicePath.c_str());
         return;
     }
diff --git a/services/state/src/dinput_state.cpp b/services/state/src/dinput_state.cpp
index 1ecdbfac4e03cccd5fdd1a60de7feb28b82dbd67..7dc529026981a0cfa46fd87471a43f961388da3b 100644
--- a/services/state/src/dinput_state.cpp
+++ b/services/state/src/dinput_state.cpp
@@ -22,10 +22,10 @@
 #include <unistd.h>
 #include <vector>
 
+#include "constants_dinput.h"
 #include "dinput_errcode.h"
 #include "dinput_log.h"
 #include "dinput_utils_tool.h"
-#include "constants_dinput.h"
 #include "distributed_input_collector.h"
 #include "distributed_input_inject.h"
 #include "distributed_input_sink_transport.h"
@@ -143,10 +143,10 @@ void DInputState::SpecEventInject(const int32_t &sessionId, std::vector<std::str
     std::vector<std::string> keyboardNodeDhIds;
     DistributedInputCollector::GetInstance().GetShareKeyboardPathsByDhIds(dhids, keyboardNodePaths, keyboardNodeDhIds);
     DistributedInputInject::GetInstance().GetVirtualKeyboardPathsByDhIds(dhids, keyboardNodePaths, keyboardNodeDhIds);
-    ssize_t len = keyboardNodePaths.size();
-    for (ssize_t i = 0; i < len; ++i) {
+    size_t len = keyboardNodePaths.size();
+    for (size_t i = 0; i < len; ++i) {
         std::vector<uint32_t> keyboardPressedKeys;
-        int fd = -1;
+        int fd = UN_INIT_FD_VALUE;
         CheckKeyboardState(keyboardNodeDhIds[i], keyboardNodePaths[i], keyboardPressedKeys, fd);
         for (auto &code : keyboardPressedKeys) {
             struct input_event event = {
diff --git a/utils/src/dinput_utils_tool.cpp b/utils/src/dinput_utils_tool.cpp
index bb6db414a52ffa45caaf4127e85e92767a3dcc7f..659e93db84e947a2187227472f6966d173f6595c 100644
--- a/utils/src/dinput_utils_tool.cpp
+++ b/utils/src/dinput_utils_tool.cpp
@@ -300,7 +300,7 @@ void CloseFd(int& fd)
         return;
     }
     close(fd);
-    fd = -1;
+    fd = UN_INIT_FD_VALUE;
 }
 
 int BitIsSet(const unsigned long *array, int bit)