On 8/29/21 4:13 AM, Gisle Vanem wrote:

> With some added trace-code I found this was for
> SIGHUP (=1) which is not supported. So I just dropped
> SIGHUP from the list. 

Thanks for reporting that. I installed the attached, which I hope fixes 
the problem in a more-portable way. Please give it a try.

In hindsight perhaps 'diff' should never have added signal handling, as 
it's a bug magnet. If your display's colors get messed up due to ^C the 
shell should fix the colors, not 'diff'.