On Mon, 06 Jan 2020 01:10:57 +0100, Christoph Moench-Tegeder
<c...@burggraben.net> wrote:
When a program is invoked via /usr/sbin/daemon, it should already be
session leader AND group leader, and then the above code WOULD be a
NOOP, unless POSIX would require the setpgid() to fail and thereby the
program to abort - which, btw, is NOT a NOOP :(
https://pubs.opengroup.org/onlinepubs/9699919799/
"The setpgid() function shall fail if: [...] The process indicated by
the
pid argument is a session leader."
Okay, so, what You are saying is that I got correct information insofar
that POSIX indeed demands the perceived behaviour. Thanks for that
confirmation.
Not much room to argue?
Why that? This is not about laws you have to follow blindly whether you
understand them or not, this is all about an Outcome - a working machine
that should properly function.
So either there are other positive aspects in this behaviour that weight
against the perceived malfunction, or the requirement is simply wrong. And
the latter case should be all the argument that is needed.
I do not say disobey Posix. I only say that one of the involved parts must
certainly be wrong, and that should be fixed. So if You are saying, the
problem is in Posix, but we are in the role of blind monkeys who have to
follow that alien commandment by all means no matter the outcome, then
this does not seem acceptable to me. Actually, as it seems to me, this
whole session thing came originally out of Kirk McKusick's kitchen and
made its way from there into Posix, so if there is indeed a flaw in it, it
should well be possible to fix it going the same way.
In any case, this here (to be found in /etc/rc,d/kadmind) is a crappy
workaround and not acceptable style:
command_args="$command_args &"
We aren't slaves, or, are we?
I for my part came just accidentially across this matter, and as my stance
is, 1. the code has to be solid enough to stand the Jupiter mission, and
therefore 2. do a rootcause Always, on Every misbehaviour (and then fix it
once and for all), so I figured that thing out.
rgds,
PMc
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