-XBT_PRIVATE smx_activity_t SIMIX_file_read(surf_file_t fd, sg_size_t size, sg_host_t host);
-XBT_PRIVATE smx_activity_t SIMIX_file_write(surf_file_t fd, sg_size_t size, sg_host_t host);
+XBT_PRIVATE smx_activity_t SIMIX_file_read(surf_file_t fd, sg_size_t size);
+XBT_PRIVATE smx_activity_t SIMIX_file_write(surf_file_t fd, sg_size_t size);