handling possible stat() error

src/iperf_api.c

@@ -1570,11 +1570,13 @@ iperf_parse_arguments(struct iperf_test *test, int argc, char **argv)
         test->role == 'c'
         ){
         struct stat st;
-        stat(test->diskfile_name, &st);
-        iperf_size_t file_bytes = st.st_size;
-        test->settings->bytes = file_bytes;        
-        if (test->debug)
-            printf("End condition set to file-size: %d bytes\n", test->settings->bytes);
+        if( stat(test->diskfile_name, &st) == 0 ){
+            iperf_size_t file_bytes = st.st_size;
+            test->settings->bytes = file_bytes;        
+            if (test->debug)
+                printf("End condition set to file-size: %d bytes\n", test->settings->bytes);
+        }
+        // if failing to read file stat, it should fallback to default duration mode
     }    
 
     if ((test->settings->bytes != 0 || test->settings->blocks != 0) && ! duration_flag)