diff --git a/mbtk/mbtk_utils/at.c b/mbtk/mbtk_utils/at.c
index 950d3e2..1e8f91b 100755
--- a/mbtk/mbtk_utils/at.c
+++ b/mbtk/mbtk_utils/at.c
@@ -11,9 +11,11 @@
 #include <netinet/in.h>
 #include <signal.h>
 #include <unistd.h>
+#include <pthread.h>
 #include <sys/select.h>
 
 #include "mbtk_type.h"
+#include "mbtk_utils.h"
 
 //#define AT_TYPE_SOCKET
 #define MBTK_LOG
@@ -39,8 +41,8 @@
     AT_MODE_DEV_2
 } at_mode_enum;
 
-static int epoll_fd = -1;
-static struct epoll_event epoll_events[20];
+// static int epoll_fd = -1;
+// static struct epoll_event epoll_events[20];
 static int at_fd = -1;
 static at_mode_enum at_mode = AT_MODE_SOCK_1;
 
@@ -54,15 +56,16 @@
 		"NO DIALTONE",
 		NULL};
 
-//#ifdef AT_TYPE_SOCKET
+#ifndef TEMP_FAILURE_RETRY
 #define TEMP_FAILURE_RETRY(exp) ({         \
     typeof (exp) _rc;                      \
     do {                                   \
         _rc = (exp);                       \
     } while (_rc == -1 && errno == EINTR); \
     _rc; })
-//#endif
+#endif
 
+#if 0
 static void at_epoll_change(int is_add,int fd)
 {
     struct epoll_event ev;
@@ -95,6 +98,7 @@
 
     return 0;
 }
+#endif
 
 //#ifdef AT_TYPE_SOCKET
 int openSocket(const char* sockname)
@@ -349,7 +353,7 @@
     pthread_attr_t attr;
     pthread_attr_init (&attr);
     pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
-    int ret = pthread_create(&tid, &attr, read_thread_run, &attr);
+    int ret = pthread_create(&tid, &attr, read_thread_run, NULL);
     if (ret < 0)
     {
         LOGE("pthread_create\n");
@@ -595,10 +599,10 @@
                         memset(write_buff, 0x0, 1024);
                         printf("%s\n", read_buff);
                         len = snprintf(write_buff, 1024, "%s\n", read_buff);
-                        write(at_fd, write_buff, len);
+                        mbtk_write(at_fd, write_buff, len);
                     } else {
                         printf("Read error:%d\n",errno);
-                        return NULL;
+                        return -1;
                     }
                 }
 #endif