3 Jan
2023
3 Jan
'23
10:32 p.m.
On 12/31/22 2:24 PM, Clem Cole wrote:
I seem to remember that someone got wedged into
System V
that was awful and unusable.
IIRC it was in SVR2 that a version of a job control system added some of
the semantics of Kulp's scheme to the kernel, but not all as you point out
and it was pretty disappointing if you had grown up on BSD systems. Later
POSIX would pick up the Kulp/BSD Job Control definition and by SVR3/SVR4
AT&T fleshed out all all of the semantics.
There is a pretty good discussion of 4.2 BSD-style job control and ways to
make it fit with System V semantics (mostly controlling terminals and, of
course, process groups) at
https://web.physics.ucsb.edu/~pcs/apps/bash/job.control.ps
This is probably the best description of BSD-style job control, and it is
the inspiration for much of the POSIX job control design (e.g., their
invention of "sessions" as the replacement for System V style process
groups).
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU chet(a)case.edu http://tiswww.cwru.edu/~chet/