On 10/28/21 12:11, Paul Eggert wrote:
> Wait - lseek returns a number less than -1?! We could easily check for 
> that FreeBSD bug, perhaps as an independent patch; this shouldn't 
> require any extra syscalls.

I installed the attached patch to do this. This doesn't fix coreutils 
bug#51433; it merely makes 'cp' and similar programs more likely to 
detect and report the FreeBSD 9.1 bug you mentioned.