int unw_apply_reg_state(unw_cursor_t *cp, void *reg_states_data);
The unw_apply_reg_state() routine updates the register values of a cursor according to the instructions in reg_states_data, which have been obtained by calling unw_reg_states_iterate.
On successful completion, unw_apply_reg_state() returns 0. Otherwise the negative value of one of the error-codes below is returned.
Thread and Signal Safety
unw_apply_reg_state() is thread-safe. If cursor cp is in the local address-space, this routine is also safe to use from a signal handler.
An unspecified error occurred.
Libunwind was unable to locate unwind-info for the procedure.
The unwind-info for the procedure has version or format that is not understood by libunwind.
In addition, unw_apply_reg_state() may return any error returned by the access_mem() call-back (see unw_create_addr_space(3)).