On Fri, 21 Oct 2016, Maciej W. Rozycki wrote: > If we had such a dedicated virtual $fre, and we decided sometime to let > the user actually write to it and switch the mode process-wide, then we > could simply invoke the right prctl(2) call in response to the user's > ptrace(2) request. Or we could call it $fp_mode and map it directly to prctl(PR_GET_FP_MODE) and prctl(PR_SET_FP_MODE, ...). Maciej
