-SG_BEGIN_DECL()
-XBT_PUBLIC(const char*) sg_link_name(sg_link_t link);
-XBT_PUBLIC(sg_link_t) sg_link_by_name(const char* name);
-XBT_PUBLIC(int) sg_link_is_shared(sg_link_t link);
-XBT_PUBLIC(double) sg_link_bandwidth(sg_link_t link);
-XBT_PUBLIC(double) sg_link_latency(sg_link_t link);
-XBT_PUBLIC(void*) sg_link_data(sg_link_t link);
-XBT_PUBLIC(void) sg_link_data_set(sg_link_t link, void* data);
-XBT_PUBLIC(int) sg_link_count();
-XBT_PUBLIC(sg_link_t*) sg_link_list();
-XBT_PUBLIC(void) sg_link_exit();
-SG_END_DECL()
+SG_BEGIN_DECL
+XBT_PUBLIC const char* sg_link_name(const_sg_link_t link);
+XBT_PUBLIC sg_link_t sg_link_by_name(const char* name);
+XBT_PUBLIC int sg_link_is_shared(const_sg_link_t link);
+XBT_PUBLIC double sg_link_bandwidth(const_sg_link_t link);
+XBT_PUBLIC void sg_link_bandwidth_set(sg_link_t link, double value);
+XBT_PUBLIC double sg_link_latency(const_sg_link_t link);
+XBT_PUBLIC void sg_link_latency_set(sg_link_t link, double value);
+XBT_PUBLIC void* sg_link_data(const_sg_link_t link);
+XBT_PUBLIC void sg_link_data_set(sg_link_t link, void* data);
+XBT_PUBLIC int sg_link_count();
+XBT_PUBLIC sg_link_t* sg_link_list();
+SG_END_DECL