[TUHS] Sockets and the true UNIX

Chet Ramey chet.ramey at case.edu
Sat Sep 23 05:08:10 AEST 2017


On 9/22/17 2:14 PM, Chris Torek wrote:

> Job control ought to be independent of tty devices: each shell
> pipeline is a "job", and the shell should group them by having the
> kernel create an initial empty(ish -- the shell is a member of
> both its original pgroup and this one it just created, until it
> detaches from it) job, then pushing each process it forks into
> that pgroup.

In that sense, job control and process groups *are* independent of
the terminal device.

The complication arises when you have to multiplex one terminal
between several different jobs in an interactive shell. Setting
the terminal process group correctly -- the only way to accomplish
that -- is fragile and the consequences of setting it to the wrong
value are inconvenient, to say the least.

Chet
-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
		 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet at case.edu    http://cnswww.cns.cwru.edu/~chet/



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