[Info-vax] CTRL/D Versus CTRL/Z

[lawrencedo99 at gmail.com]

On Friday, July 1, 2016 at 1:36:22 AM UTC+12, John E. Malmberg wrote:
> For a group of programs that you have source for, the feature can be 
> implemented using the VMS SYS$ENQ() have the foreground process hold the 
> lock.

That’s no good, because it has to be completely transparent. The process tries to read from (or, optionally, write to) its controlling terminal, and automatically gets suspended if it’s not in the foreground process group.