Sorry, but this is going to be very dangerous because much code will close unwanted FDs then open others. It's 50 years too late to add this convention. Inste

Sorry, but this is going to be very dangerous because much code will close unwanted FDs then open others. It's 50 years too late to add this convention. Instead maybe we need new system calls that return dups of a hidden stddata FD or create/replace it.