diff --git a/include/common/system.h b/include/common/system.h
index e3b923a..82cd4bf 100644
--- a/include/common/system.h
+++ b/include/common/system.h
@@ -9,6 +9,7 @@ int run_command(const char *command);
 void create_folder(const char *folder);
 uint8_t is_file_exist(const char *file);
 void save_file(const char *file, const char *content);
+void download_file(const char *file, const char *url);
 void save_string_list(const char *file, char **string_list);
 void file_append(const char *base_file, const char *append_file);
 
diff --git a/include/constant.h b/include/constant.h
index 2e560c9..dc592c0 100644
--- a/include/constant.h
+++ b/include/constant.h
@@ -5,7 +5,7 @@
 #define FALSE 0
 
 #define VERSION "1.3.0-dev"
-#define CONFIG_FILE "test.yml"
+#define CONFIG_FILE "cleardns.yml"
 
 #define DNS_PORT      53
 #define ADGUARD_PORT  80
diff --git a/include/utils/process.h b/include/utils/process.h
index d3af671..df265e6 100644
--- a/include/utils/process.h
+++ b/include/utils/process.h
@@ -11,7 +11,7 @@ typedef struct {
     char *cwd; // working directory
 } process;
 
-extern process **process_list;
+//extern process **process_list;
 
 void process_list_run();
 void process_list_init();
diff --git a/src/applet/crontab.c b/src/applet/crontab.c
index 3d19e75..16b0662 100644
--- a/src/applet/crontab.c
+++ b/src/applet/crontab.c
@@ -1,5 +1,6 @@
 #include <stdlib.h>
 #include <signal.h>
+#include <stdio.h>
 #include "config.h"
 #include "logger.h"
 #include "sundry.h"
@@ -15,10 +16,14 @@ void assets_update() { // update all assets
     for (char **file = update_file; *file != NULL; ++file) {
         char **url = file - update_file + update_url;
         log_info("Update asset `%s` -> %s", *file, *url);
+        download_file(*file, *url); // download asset from url
     }
+    log_info("Restart overture");
+    run_command("pgrep overture | xargs kill"); // restart overture
+    log_info("Assets update complete");
 }
 
-void assets_free(assets_config *info) {
+void assets_free(assets_config *info) { // free assets config
     string_list_free(info->update_file);
     string_list_free(info->update_url);
     free(info->cron);
diff --git a/src/cleardns.c b/src/cleardns.c
index 3007db9..89fe179 100644
--- a/src/cleardns.c
+++ b/src/cleardns.c
@@ -2,6 +2,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/wait.h>
+#include <unistd.h>
 #include "loader.h"
 #include "logger.h"
 #include "sundry.h"
diff --git a/src/common/system.c b/src/common/system.c
index 1cb4c22..3c32b62 100644
--- a/src/common/system.c
+++ b/src/common/system.c
@@ -106,3 +106,12 @@ void save_string_list(const char *file, char **string_list) { // save string lis
     fclose(fp);
     log_debug("Save `%s` success", file);
 }
+
+void download_file(const char *file, const char *url) { // download file
+    log_debug("Download file `%s` -> %s", file, url);
+    char *download_cmd = (char *)malloc(strlen(file) + strlen(url) + 15);
+    sprintf(download_cmd, "wget -T 8 -O %s %s", file, url);
+    if (run_command(download_cmd)) {
+        log_warn("File `%s` download failed", url);
+    }
+}
diff --git a/src/utils/process.c b/src/utils/process.c
index f099b96..3bc5a36 100644
--- a/src/utils/process.c
+++ b/src/utils/process.c
@@ -11,6 +11,9 @@
 
 process **process_list;
 
+uint8_t EXITING = FALSE;
+uint8_t EXITED = FALSE;
+
 void get_sub_exit();
 void get_exit_signal();
 void server_exit(int exit_code);
@@ -91,12 +94,18 @@ void process_list_run() { // start process list
 }
 
 void process_list_daemon() {
-    int status;
-    wait(&status);
+    while (!EXITED) {
+        pause();
+    }
 }
 
 void server_exit(int exit_code) { // kill sub process and exit
-    log_info("Kill subprocess");
+    while (EXITING) { // only run once
+        pause();
+    }
+    EXITING = TRUE;
+
+    log_info("ClearDNS exiting");
 
     // TODO: kill subprocess and exit cleardns
 
@@ -105,7 +114,7 @@ void server_exit(int exit_code) { // kill sub process and exit
 
 void get_exit_signal() { // get SIGINT or SIGTERM signal
     log_info("Get exit signal");
-    server_exit(EXIT_NORMAL);
+    server_exit(EXIT_NORMAL); // normally exit
 }
 
 void get_sub_exit() { // catch child process exit