程序启动后，pid写入配置文件（程序更新时需要，如果不写入，程序更新后程序重启，pid和守护进程记录的不一致，造成守护进程无法监控程序的问题）

src/FMDbMonitor.cpp

@@ -6,12 +6,14 @@
 #include <errno.h>
 #include <sys/types.h>
 #include <sys/socket.h>
+#include <sys/syscall.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <unistd.h>
 #include <pthread.h>
 #include <ifaddrs.h>
 #include <string.h>
+#include <fstream>
 #include "../base/FM_ErrorCode.h"
 #include "SQLiteOperate.h"
 #include "PayProcess.h"
@@ -22,7 +24,7 @@
 #define ELPP_NO_DEFAULT_LOG_FILE
 #include "../3rdParty/easylogging/easylogging++.h"
 
-
+using namespace std;
 #define BUFFER_SIZE             1024 //缓冲区大小
 void InitSystem();
 void Init();
@@ -64,6 +66,14 @@ int main()
     //SetUnhandledExceptionFilter(FMExcpHandler); 
     signal(SIGINT, app_stopped);
     LOG(INFO)<<"启动 FMDbMonitor";
+    pid_t tid;
+    tid = syscall(SYS_gettid);
+    std::string strPidPath = GetProcDir(); 
+    strPidPath.append("pidMonitor.txt");
+    LOG(INFO)<<"get process pid:"<<tid<<" file name:"<<strPidPath.data();
+    fstream f(strPidPath.c_str(),ios::out);
+    f<<tid;
+    f.close();
 
     int nrlt = EC_OK;
     while (dbOperation->DBConnect()!= EC_OK)