diff --git a/include/constant.h b/include/constant.h
index 3bc8dbb..2e560c9 100644
--- a/include/constant.h
+++ b/include/constant.h
@@ -36,6 +36,12 @@
 #define ASSET_CHINA_IP   "china-ip.txt"
 #define ASSET_CHINA_LIST "chinalist.txt"
 
+#define EXIT_NORMAL 0
+#define EXIT_FILE_ERROR 1
+#define EXIT_FORK_ERROR 2
+#define EXIT_EXEC_ERROR 3
+#define EXIT_WAIT_ERROR 4
+
 #define HELP_MSG "\
 ClearDNS usage \n\
 --debug ...\n\
diff --git a/include/utils/process.h b/include/utils/process.h
index 2d8e5b0..8fb82fd 100644
--- a/include/utils/process.h
+++ b/include/utils/process.h
@@ -4,10 +4,12 @@
 #include <stdint.h>
 
 typedef struct {
+    int pid;
     char *name;
     char **cmd;
     char **env;
     char *cwd;
+    // TODO: add is_daemon option
     int8_t is_group; // bool value
 } process;
 
@@ -18,6 +20,6 @@ void process_add_arg(process *proc, const char *arg);
 process* process_init(const char *caption, const char *bin);
 
 #include <unistd.h>
-pid_t process_exec(process *proc);
+void process_exec(process *proc);
 
 #endif
diff --git a/src/cleardns.c b/src/cleardns.c
index 2a464b3..62e6e50 100644
--- a/src/cleardns.c
+++ b/src/cleardns.c
@@ -48,9 +48,6 @@ int main(int argc, char *argv[]) { // ClearDNS service
     LOG_LEVEL = LOG_DEBUG;
     log_info("ClearDNS server start (%s)", VERSION);
 
-//    remove_file("/tmp/test.txt");
-    create_folder("/tmp/test");
-    return 0;
 
 //    process *test = process_init("TEST", "lls");
 //    process *test = process_init("TEST", "ls");
@@ -65,15 +62,12 @@ int main(int argc, char *argv[]) { // ClearDNS service
 
     create_folder(WORK_DIR);
 
-    // TODO: load assets first
     extract_assets();
     load_config(config_file);
     free(config_file);
 
     assets_load(loader.assets);
 
-    return 0;
-
     if (LOG_LEVEL == LOG_DEBUG) { // debug mode enabled
         loader.filter->debug = TRUE;
         loader.diverter->debug = TRUE;
@@ -82,7 +76,9 @@ int main(int argc, char *argv[]) { // ClearDNS service
     }
 
     process_list_init();
+
     // TODO: crontab of assets
+//    process_list_append(assets_load(loader.assets));
 
     process_list_append(dnsproxy_load("Domestic", loader.domestic, "domestic.json"));
     process_list_append(dnsproxy_load("Foreign", loader.foreign, "foreign.json"));
@@ -90,25 +86,15 @@ int main(int argc, char *argv[]) { // ClearDNS service
     if (loader.filter != NULL) {
         process_list_append(adguard_load(loader.filter, ADGUARD_DIR));
     }
-    // TODO: running custom script
     for (char **script = loader.script; *script != NULL; ++script) {
         log_info("Run custom script -> `%s`", *script);
+        run_command(*script);
     }
 
-//    process_list_run();
-
-
-//    init_server(init_script, custom_script); // run init script and custom script
-//
-//    load_start_command(adguard_workdir, overture_config, upstream_config, debug_mode); // generate commands
-//    if (debug_mode) { // show exec command
-//        fprintf(stderr, "[ClearDNS] Debug mode.\n");
-//        show_command("[ClearDNS] adguard", adguard_command);
-//        show_command("[ClearDNS] overture", overture_command);
-//        show_command("[ClearDNS] dnsproxy (domestic)", domestic_dnsproxy_command);
-//        show_command("[ClearDNS] dnsproxy (foreign)", foreign_dnsproxy_command);
-//    }
-//
-//    server_daemon(); // run as daemon to manage process in docker
+    process_list_run();
+
+    int status;
+    wait(&status);
+
     return 0;
 }
diff --git a/src/utils/process.c b/src/utils/process.c
index 9e1d61e..fd9f617 100644
--- a/src/utils/process.c
+++ b/src/utils/process.c
@@ -14,6 +14,7 @@ process **process_list;
 
 process* process_init(const char *caption, const char *bin) { // init process struct
     process *proc = (process *)malloc(sizeof(process));
+    proc->pid = 0; // process not running
     proc->name = string_init(caption); // process caption
     proc->cmd = string_list_init();
     string_list_append(&proc->cmd, bin); // argv[0] normally be process file name
@@ -41,16 +42,42 @@ void process_list_append(process *proc) { // add new process into process list
     log_debug("%s process added", proc->name);
 }
 
+void server_exit(int exit_code) { // kill sub process and exit
+    log_info("Kill subprocess");
+
+    // TODO: kill subprocess and exit cleardns
+
+    exit(exit_code);
+}
+
+void get_exit_signal() { // get SIGINT or SIGTERM signal
+    log_info("Get exit signal");
+
+    server_exit(EXIT_NORMAL);
+}
+
+void get_sub_exit() { // catch child process exit
+
+    log_debug("Get SIGCHLD signal");
+
+    // TODO: check exit subprocess and restart it
+}
+
 void process_list_run() {
+
+    signal(SIGINT, get_exit_signal); // catch Ctrl + C (2)
+    signal(SIGTERM, get_exit_signal); // catch exit signal (15)
+    signal(SIGCHLD, get_sub_exit); // callback when child process die
+
     for (process **p = process_list; *p != NULL; ++p) {
-        log_warn("proc -> %s", (*p)->name);
+
+        process_exec(*p);
+
     }
-}
 
-void server_exit() {
-    // TODO: kill subprocess and exit cleardns
-}
+    log_warn("Process list start complete");
 
+}
 
 void process_dump(process *proc) {
     char *process_cmd = string_list_dump(proc->cmd);
@@ -63,17 +90,19 @@ void process_dump(process *proc) {
     free(process_cmd);
 }
 
-pid_t process_exec(process *proc) {
+void process_exec(process *proc) {
     pid_t pid;
 
     process_dump(proc);
 
+    log_info("%s start", proc->name);
+
     if ((pid = fork()) < 0) { // fork error
-        log_perror("Fork error");
-        server_exit();
+        log_perror("%s fork error", proc->name);
+        server_exit(EXIT_FORK_ERROR);
     } else if (pid == 0) { // child process
-        // TODO: new process group
 
+        // TODO: new process group
         if (proc->is_group) {
             setpgrp(); // new process group
         }
@@ -90,7 +119,8 @@ pid_t process_exec(process *proc) {
         }
     }
 
-    return pid;
+    proc->pid = pid;
+    log_info("%s running success -> PID = %d", proc->name, proc->pid);
 
 }