diff --git a/src/connection_pool.h b/src/connection_pool.h
index 81e12ca..ea0c8c4 100644
--- a/src/connection_pool.h
+++ b/src/connection_pool.h
@@ -75,7 +75,7 @@ typedef struct tagConnectionPool {
 	int max_count_per_entry;  //0 means no limit
 
 	/*
-	connections whose the idle time exceeds this time will be closed
+	connections whose idle time exceeds this time will be closed
     unit: second
 	*/
 	int max_idle_time;
diff --git a/src/process_ctrl.c b/src/process_ctrl.c
index c16871e..ce05be4 100644
--- a/src/process_ctrl.c
+++ b/src/process_ctrl.c
@@ -112,7 +112,7 @@ static int do_stop(const char *pidFilename, const bool bShowError, pid_t *pid)
   }
 }
 
-int process_stop(const char *pidFilename)
+int process_stop_ex(const char *pidFilename, const bool bShowError)
 {
 #define MAX_WAIT_COUNT  300
   pid_t pid;
@@ -120,7 +120,7 @@ int process_stop(const char *pidFilename)
   int sig;
   int i;
 
-  if ((result=do_stop(pidFilename, true, &pid)) != 0) {
+  if ((result=do_stop(pidFilename, bShowError, &pid)) != 0) {
     return result;
   }
 
@@ -148,9 +148,10 @@ int process_stop(const char *pidFilename)
 
 int process_restart(const char *pidFilename)
 {
+  const bool bShowError = false;
   int result;
 
-  result = process_stop(pidFilename);
+  result = process_stop_ex(pidFilename, bShowError);
   if (result == ENOENT || result == ESRCH) {
     result = 0;
   } else if (result == 0) {
@@ -328,6 +329,7 @@ int get_base_path_from_conf_file(const char *filename, char *base_path,
 
 int process_action(const char *pidFilename, const char *action, bool *stop)
 {
+    const bool bShowError = true;
 	*stop = false;
 	if (action == NULL)
 	{
@@ -337,7 +339,7 @@ int process_action(const char *pidFilename, const char *action, bool *stop)
 	if (strcmp(action, "stop") == 0)
 	{
 		*stop = true;
-		return process_stop(pidFilename);
+		return process_stop_ex(pidFilename, bShowError);
 	}
 	else if (strcmp(action, "restart") == 0)
 	{
diff --git a/src/process_ctrl.h b/src/process_ctrl.h
index 6f44fd7..105bf55 100644
--- a/src/process_ctrl.h
+++ b/src/process_ctrl.h
@@ -36,7 +36,9 @@ int write_to_pid_file(const char *pidFilename);
 
 int delete_pid_file(const char *pidFilename);
 
-int process_stop(const char *pidFilename);
+int process_stop_ex(const char *pidFilename, const bool bShowError);
+
+#define process_stop(pidFilename) process_stop_ex(pidFilename, true)
 
 int process_restart(const char *pidFilename);