protect against failed get

[simgrid.git] / src / smpi / bindings / smpi_f77_comm.cpp

diff --git a/src/smpi/bindings/smpi_f77_comm.cpp b/src/smpi/bindings/smpi_f77_comm.cpp
index cf75fd3..cfa7eaa 100644 (file)
--- a/src/smpi/bindings/smpi_f77_comm.cpp
+++ b/src/smpi/bindings/smpi_f77_comm.cpp
@@ -1,4 +1,4 @@
-/* Copyright (c) 2010-2017. The SimGrid Team. All rights reserved.          */
+/* Copyright (c) 2010-2018. The SimGrid Team. All rights reserved.          */
 
 /* This program is free software; you can redistribute it and/or modify it
  * under the terms of the license (GNU LGPL) which comes with this package. */
@@ -71,9 +71,11 @@ void mpi_comm_create_group_ (int* comm, int* group, int i, int* comm_out, int* i
   }
 }
 
-void mpi_comm_get_attr_ (int* comm, int* comm_keyval, void *attribute_val, int *flag, int* ierr){
-
- *ierr = MPI_Comm_get_attr (simgrid::smpi::Comm::f2c(*comm), *comm_keyval, attribute_val, flag);
+void mpi_comm_get_attr_ (int* comm, int* comm_keyval, int *attribute_val, int *flag, int* ierr){
+ int* value = nullptr;
+ *ierr = MPI_Comm_get_attr (simgrid::smpi::Comm::f2c(*comm), *comm_keyval, &value, flag);
+ if (*flag == 1)
+   *attribute_val = *value;
 }
 
 void mpi_comm_set_attr_ (int* comm, int* comm_keyval, void *attribute_val, int* ierr){