fix stdin bug for enb

srsenb/src/main.cc

@@ -344,6 +344,10 @@ void *input_loop(void *m)
   char key;
   while(running) {
     cin >> key;
+    if (cin.eof() || cin.bad()) {
+      cout << "Closing stdin thread." << endl;
+      break;
+    } else {
       if('t' == key) {
         do_metrics = !do_metrics;
         if(do_metrics) {
@@ -354,6 +358,7 @@ void *input_loop(void *m)
         metrics->toggle_print(do_metrics);
       }
     }
+  }
   return NULL;
 }