diff --git a/src/sf_global.c b/src/sf_global.c
index 332ac1e..bb6c1cf 100644
--- a/src/sf_global.c
+++ b/src/sf_global.c
@@ -210,7 +210,7 @@ int sf_load_config_ex(const char *server_name, const char *filename,
                 sizeof(g_sf_global_vars.run_by_group),
                 "%s", pRunByGroup);
     }
-    if (*g_sf_global_vars.run_by_group == '\0') {
+    if (*(g_sf_global_vars.run_by_group) == '\0') {
         g_sf_global_vars.run_by_gid = getegid();
     }
     else {
@@ -237,7 +237,7 @@ int sf_load_config_ex(const char *server_name, const char *filename,
                 sizeof(g_sf_global_vars.run_by_user),
                 "%s", pRunByUser);
     }
-    if (*g_sf_global_vars.run_by_user == '\0') {
+    if (*(g_sf_global_vars.run_by_user) == '\0') {
         g_sf_global_vars.run_by_uid = geteuid();
     }
     else {
diff --git a/src/sf_global.h b/src/sf_global.h
index f317e71..5d43ad4 100644
--- a/src/sf_global.h
+++ b/src/sf_global.h
@@ -57,12 +57,13 @@ typedef struct sf_global_variables {
 extern "C" {
 #endif
 
-extern SFGlobalVariables     g_sf_global_vars;
+extern SFGlobalVariables       g_sf_global_vars;
 
 #define SF_G_BASE_PATH         g_sf_global_vars.base_path
 #define SF_G_CONTINUE_FLAG     g_sf_global_vars.continue_flag
 #define SF_G_CONNECT_TIMEOUT   g_sf_global_vars.connect_timeout
 #define SF_G_NETWORK_TIMEOUT   g_sf_global_vars.network_timeout
+#define SF_G_WORK_THREADS      g_sf_global_vars.work_threads
 #define SF_G_THREAD_STACK_SIZE g_sf_global_vars.thread_stack_size
 
 #define SF_SET_CUSTOM_CONFIG(cfg, prefix_name, port) \
@@ -71,6 +72,23 @@ extern SFGlobalVariables     g_sf_global_vars;
         (cfg).default_port = port; \
     } while (0)
 
+#define SF_CHOWN_RETURN_ON_ERROR(path, current_uid, current_gid) \
+    do { \
+    if (!(g_sf_global_vars.run_by_gid == current_gid && \
+                g_sf_global_vars.run_by_uid == current_uid)) \
+    { \
+        if (chown(path, g_sf_global_vars.run_by_uid, \
+                    g_sf_global_vars.run_by_gid) != 0) \
+        { \
+            logError("file: "__FILE__", line: %d, " \
+                "chown \"%s\" fail, " \
+                "errno: %d, error info: %s", \
+                __LINE__, path, errno, STRERROR(errno)); \
+            return errno != 0 ? errno : EPERM; \
+        } \
+    } \
+    } while (0)
+
 int sf_load_config(const char *server_name, const char *filename, 
         IniContext *pIniContext, const int default_inner_port,
         const int default_outer_port);
diff --git a/src/sf_service.c b/src/sf_service.c
index 4c7cbf8..72b8093 100644
--- a/src/sf_service.c
+++ b/src/sf_service.c
@@ -68,7 +68,9 @@ int sf_service_init(sf_alloc_thread_extra_data_callback
         return result;
     }
 
-    if ((result=init_pthread_attr(&thread_attr, g_sf_global_vars.thread_stack_size)) != 0) {
+    if ((result=init_pthread_attr(&thread_attr, g_sf_global_vars.
+                    thread_stack_size)) != 0)
+    {
         logError("file: "__FILE__", line: %d, "
             "init_pthread_attr fail, program exit!", __LINE__);
         return result;
@@ -83,8 +85,9 @@ int sf_service_init(sf_alloc_thread_extra_data_callback
     alloc_conn_once = ALLOC_CONNECTIONS_ONCE / m;
     init_connections = g_sf_global_vars.max_connections < alloc_conn_once ?
         g_sf_global_vars.max_connections : alloc_conn_once;
-    if ((result=free_queue_init_ex(g_sf_global_vars.max_connections, init_connections,
-                    alloc_conn_once, g_sf_global_vars.min_buff_size, g_sf_global_vars.max_buff_size,
+    if ((result=free_queue_init_ex(g_sf_global_vars.max_connections,
+                    init_connections, alloc_conn_once, g_sf_global_vars.
+                    min_buff_size, g_sf_global_vars.max_buff_size,
                     task_arg_size)) != 0)
     {
         return result;
@@ -102,7 +105,9 @@ int sf_service_init(sf_alloc_thread_extra_data_callback
 
     g_worker_thread_count = 0;
     pDataEnd = g_sf_global_vars.thread_data + g_sf_global_vars.work_threads;
-    for (pThreadData=g_sf_global_vars.thread_data; pThreadData<pDataEnd; pThreadData++) {
+    for (pThreadData=g_sf_global_vars.thread_data; pThreadData<pDataEnd;
+            pThreadData++)
+    {
         pThreadData->thread_loop_callback = thread_loop_callback;
         if (alloc_thread_extra_data_callback != NULL) {
             pThreadData->arg = alloc_thread_extra_data_callback(
@@ -182,7 +187,9 @@ int sf_service_destroy()
 
     free_queue_destroy();
     pDataEnd = g_sf_global_vars.thread_data + g_sf_global_vars.work_threads;
-    for (pThreadData=g_sf_global_vars.thread_data; pThreadData<pDataEnd; pThreadData++) {
+    for (pThreadData=g_sf_global_vars.thread_data; pThreadData<pDataEnd;
+            pThreadData++)
+    {
         fast_timer_destroy(&pThreadData->timer);
     }
     free(g_sf_global_vars.thread_data);
@@ -224,27 +231,32 @@ int sf_socket_server()
     const char *bind_addr;
 
     if (g_sf_global_vars.outer_port == g_sf_global_vars.inner_port) {
-        if (*g_sf_global_vars.outer_bind_addr == '\0' || *g_sf_global_vars.inner_bind_addr == '\0') {
+        if (*g_sf_global_vars.outer_bind_addr == '\0' ||
+                *g_sf_global_vars.inner_bind_addr == '\0') {
             bind_addr = "";
-            return _socket_server(bind_addr, g_sf_global_vars.outer_port, &g_server_outer_sock);
-        } else if (strcmp(g_sf_global_vars.outer_bind_addr, g_sf_global_vars.inner_bind_addr) == 0) {
+            return _socket_server(bind_addr, g_sf_global_vars.outer_port,
+                    &g_server_outer_sock);
+        } else if (strcmp(g_sf_global_vars.outer_bind_addr,
+                    g_sf_global_vars.inner_bind_addr) == 0) {
             bind_addr = g_sf_global_vars.outer_bind_addr;
             if (is_private_ip(bind_addr)) {
-                return _socket_server(bind_addr, g_sf_global_vars.inner_port, &g_server_inner_sock);
+                return _socket_server(bind_addr, g_sf_global_vars.
+                        inner_port, &g_server_inner_sock);
             } else {
-                return _socket_server(bind_addr, g_sf_global_vars.outer_port, &g_server_outer_sock);
+                return _socket_server(bind_addr, g_sf_global_vars.
+                        outer_port, &g_server_outer_sock);
             }
         }
     }
 
-    if ((result=_socket_server(g_sf_global_vars.outer_bind_addr, g_sf_global_vars.outer_port,
-                    &g_server_outer_sock)) != 0)
+    if ((result=_socket_server(g_sf_global_vars.outer_bind_addr,
+                    g_sf_global_vars.outer_port, &g_server_outer_sock)) != 0)
     {
         return result;
     }
 
-    if ((result=_socket_server(g_sf_global_vars.inner_bind_addr, g_sf_global_vars.inner_port,
-                    &g_server_inner_sock)) != 0)
+    if ((result=_socket_server(g_sf_global_vars.inner_bind_addr,
+                    g_sf_global_vars.inner_port, &g_server_inner_sock)) != 0)
     {
         return result;
     }
@@ -252,7 +264,7 @@ int sf_socket_server()
     return 0;
 }
 
-static void *accept_thread_entrance(void* arg)
+static void *accept_thread_entrance(void *arg)
 {
     int server_sock;
     int incomesock;
@@ -331,7 +343,9 @@ void _accept_loop(int server_sock, const int accept_threads)
        return;
     }
 
-    if ((result=init_pthread_attr(&thread_attr, g_sf_global_vars.thread_stack_size)) != 0) {
+    if ((result=init_pthread_attr(&thread_attr, g_sf_global_vars.
+                    thread_stack_size)) != 0)
+    {
         logWarning("file: "__FILE__", line: %d, "
                 "init_pthread_attr fail!", __LINE__);
     }
@@ -393,15 +407,15 @@ static void sigQuitHandler(int sig)
     if (!bTerminateFlag) {
         bTerminateFlag = true;
         g_sf_global_vars.continue_flag = false;
-        logCrit("file: "__FILE__", line: %d, " \
-            "catch signal %d, program exiting...", \
+        logCrit("file: "__FILE__", line: %d, "
+            "catch signal %d, program exiting...",
             __LINE__, sig);
     }
 }
 
 static void sigHupHandler(int sig)
 {
-    logInfo("file: "__FILE__", line: %d, " \
+    logInfo("file: "__FILE__", line: %d, "
         "catch signal %d", __LINE__, sig);
 }