!14565 clean code

From: @hwjiaorui
Reviewed-by: @jjfeing,@zhoufeng54
Signed-off-by: @zhoufeng54

mindspore/ccsrc/backend/kernel_compiler/kash/kernel_pack.cc

@@ -16,6 +16,7 @@
 
 #include <unistd.h>
 #include <fstream>
+#include <thread>
 #include "nlohmann/json.hpp"
 #include "securec/include/securec.h"
 #include "utils/log_adapter.h"
@@ -212,7 +213,7 @@ bool KernelPack::LoadKernelMeta(const std::string &json_f, const std::string &pr
   } catch (std::exception &e) {
     MS_LOG(WARNING) << "Parse json file error: " << json_f << ", sleep 500ms and retry again.";
     kernel_json.close();
-    usleep(500000);
+    std::this_thread::sleep_for(std::chrono::microseconds(500000));
     std::ifstream retry_tmp(json_f);
     if (!retry_tmp.is_open()) {
       MS_LOG(INFO) << "Open json file: " << json_f << " error, please check kernel_meta.";

mindspore/ccsrc/backend/kernel_compiler/oplib/oplib.cc

@@ -164,6 +164,10 @@ bool OpLib::RegOpFromLocalInfo() {
     MS_LOG(ERROR) << "Op info path is invalid: " << dir;
     return false;
   }
+  if (strlen(real_path) >= PATH_MAX) {
+    MS_LOG(ERROR) << "Op info path is invalid, the absolute path length is greater than PATH_MAX";
+    return false;
+  }
 #endif
   MS_LOG(INFO) << "Start to read op info from local file.";
   std::ifstream file(real_path);

mindspore/ccsrc/backend/kernel_compiler/tbe/tbe_kernel_build.cc

@@ -29,6 +29,7 @@
 #include "utils/ms_context.h"
 #include "runtime/dev.h"
 #include "utils/trace_base.h"
+#include "utils/ms_utils.h"
 
 namespace mindspore {
 namespace kernel {
@@ -523,7 +524,11 @@ string TbeKernelJsonCreator::GetSocVersion() {
       MS_LOG(EXCEPTION) << "GetSocVersion failed.";
     }
     // Get soc version from env value.
-    const char *soc_version_env = getenv(kSOC_VERSION);
+    const char *soc_version_env = nullptr;
+    std::string str_soc_version_env = common::GetEnv(kSOC_VERSION);
+    if (!str_soc_version_env.empty()) {
+      soc_version_env = common::SafeCStr(str_soc_version_env);
+    }
     if (soc_version_env != nullptr) {
       if (std::strcmp(soc_version, soc_version_env) != 0) {
         MS_LOG(WARNING) << "SocVerison will be change.";

mindspore/ccsrc/backend/optimizer/ascend/ir_fission/splitv_fission.cc

@@ -51,6 +51,9 @@ size_t GetSmallSplitSize(const AnfNodePtr &split_node, int64_t split_dim, int64_
   if (LongToSize(split_dim) >= input_shape.size()) {
     MS_LOG(EXCEPTION) << "The split_dim value should be less than the shape size of input 0";
   }
+  if (num_split == 0) {
+    MS_LOG(EXCEPTION) << "Divisor 'num_split' should not be 0.";
+  }
   return input_shape[split_dim] / num_split;
 }
 

mindspore/ccsrc/runtime/device/ascend/ascend_stream_assign.cc

@@ -1379,7 +1379,7 @@ vector<CNodePtr> AscendStreamAssign::GetLastInputCnode(const NotNull<KernelGraph
   }
 
   vector<CNodePtr> final_inputs;
-  uint32_t max = 0;
+  const uint32_t max = 0;
   CNodePtr max_common_cnode = nullptr;
   for (const auto &item : result) {
     if (IsHcom(item.second.first)) {