Question on 'ps -p <n>' in current
Garance A Drosihn
drosih at rpi.edu
Mon Mar 8 18:40:23 PST 2004
This topic may have come up before, a long time ago, and I just
missed it. If so, apologies for the repeat.
On stable, if you say 'ps -p <n>', and there is no process '<n>',
then you get the header-line from 'ps' and nothing else. The
command-status is set to indicate failure.
On -current, the same command gives you the error message:
ps: kvm_getprocs: No such process
and you get no header line. Other OS's also give you the header
line and no special error message.
I think this behavior in current is an unplanned side-effect of
the change in revision 1.46 of
http://www.freebsd.org/cgi/cvsweb.cgi/src/lib/libkvm/kvm_proc.c
where that was fixing a side-effect of a fix in revision 1.60
of malloc.c.
In some other OS's, 'ps' behaves the way it does for us in -stable.
Looking at SUSv3, it's not clear to me if either behavior is
preferred.
Should 'ps' in this situation behave like it does in -stable? Or
is this a change that we deliberately wanted to make in -current?
I would be willing to change 'ps' if people prefer the earlier
behavior, but I'll leave it alone if this was an intentional change.
--
Garance Alistair Drosehn = gad at gilead.netel.rpi.edu
Senior Systems Programmer or gad at freebsd.org
Rensselaer Polytechnic Institute or drosih at rpi.edu
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