+void TRACE_link_variable_set_with_time (double time, const char *link, const char *variable, double value)
+{
+ instr_user_variable (time, link, variable, "LINK", value, INSTR_US_SET, NULL);
+}
+
+void TRACE_link_variable_add_with_time (double time, const char *link, const char *variable, double value)
+{
+ instr_user_variable (time, link, variable, "LINK", value, INSTR_US_ADD, NULL);
+}
+
+void TRACE_link_variable_sub_with_time (double time, const char *link, const char *variable, double value)
+{
+ instr_user_variable (time, link, variable, "LINK", value, INSTR_US_SUB, NULL);
+}
+
+/* for link variables, but with src and dst used for get_route */
+void TRACE_link_srcdst_variable_set (const char *src, const char *dst, const char *variable, double value)
+{
+ TRACE_link_srcdst_variable_set_with_time (MSG_get_clock(), src, dst, variable, value);
+}
+
+void TRACE_link_srcdst_variable_add (const char *src, const char *dst, const char *variable, double value)
+{
+ TRACE_link_srcdst_variable_add_with_time (MSG_get_clock(), src, dst, variable, value);
+}
+
+void TRACE_link_srcdst_variable_sub (const char *src, const char *dst, const char *variable, double value)
+{
+ TRACE_link_srcdst_variable_sub_with_time (MSG_get_clock(), src, dst, variable, value);
+}
+
+void TRACE_link_srcdst_variable_set_with_time (double time, const char *src, const char *dst, const char *variable, double value)
+{
+ instr_user_srcdst_variable (time, src, dst, variable, "LINK", value, INSTR_US_SET);
+}
+
+void TRACE_link_srcdst_variable_add_with_time (double time, const char *src, const char *dst, const char *variable, double value)