子进程重启失败时，不应通知守护进程退出，确保子进程重启成功

server/System.cpp

@@ -81,19 +81,20 @@ static void sig_crash(int sig) {
 #endif // !defined(ANDROID) && !defined(_WIN32)
 
 
-void System::startDaemon() {
+void System::startDaemon(bool &kill_parent_if_failed) {
+    kill_parent_if_failed = true;
 #ifndef _WIN32
     static pid_t pid;
-    do{
+    do {
         pid = fork();
-        if(pid == -1){
+        if (pid == -1) {
             WarnL << "fork失败:" << get_uv_errmsg();
             //休眠1秒再试
             sleep(1);
             continue;
         }
 
-        if(pid == 0){
+        if (pid == 0) {
             //子进程
             return;
         }
@@ -102,21 +103,23 @@ void System::startDaemon() {
         DebugL << "启动子进程:" << pid;
         signal(SIGINT, [](int) {
             WarnL << "收到主动退出信号,关闭父进程与子进程";
-            kill(pid,SIGINT);
+            kill(pid, SIGINT);
             exit(0);
         });
 
-        do{
+        do {
             int status = 0;
-            if(waitpid(pid, &status, 0) >= 0) {
+            if (waitpid(pid, &status, 0) >= 0) {
                 WarnL << "子进程退出";
                 //休眠3秒再启动子进程
                 sleep(3);
+                //重启子进程，如果子进程重启失败，那么不应该杀掉守护进程，这样守护进程可以一直尝试重启子进程
+                kill_parent_if_failed = false;
                 break;
             }
             DebugL << "waitpid被中断:" << get_uv_errmsg();
-        }while (true);
-    }while (true);
+        } while (true);
+    } while (true);
 #endif // _WIN32
 }
 

server/System.h

@@ -16,7 +16,7 @@
 class System {
 public:
     static std::string execute(const std::string &cmd);
-    static void startDaemon();
+    static void startDaemon(bool &kill_parent_if_failed);
     static void systemSetup();
 };
 

server/main.cpp

@@ -206,9 +206,10 @@ int start_main(int argc,char *argv[]) {
 
 #if !defined(_WIN32)
         pid_t pid = getpid();
+        bool kill_parent_if_failed = true;
         if (bDaemon) {
             //启动守护进程
-            System::startDaemon();
+            System::startDaemon(kill_parent_if_failed);
         }
         //开启崩溃捕获等
         System::systemSetup();
@@ -317,7 +318,8 @@ int start_main(int argc,char *argv[]) {
             ErrorL << "程序启动失败，请修改配置文件中端口号后重试!" << endl;
             sleep(1);
 #if !defined(_WIN32)
-            if (pid != getpid()) {
+            if (pid != getpid() && kill_parent_if_failed) {
+                //杀掉守护进程
                 kill(pid, SIGINT);
             }
 #endif