On Mon, Apr 05, 2010 at 02:03:07PM -0400, Glenn Fowler wrote:
>
> what in the example code prints "bang"?
>
> On Mon, 29 Mar 2010 11:08:37 +0200 Dr. Werner Fink wrote:
> > I've just become owner of a bug report reporting a flaky behaviour
> > in handling traps on SIGCHLD. For a simply test see
>
> > ksh> echo ${sh.version}
> > Version JM 93t+ 2010-02-14
> > ksh> trap "" CHLD
> > let n=0; for d in $(seq 1 200); do if echo foo | grep bar; then echo oops
> > $((n++)); fi; done
> > bang 0
> > [...]
> > bang 177
> > ksh>
Cut&past error, one XTerm with the above example code line and
an other with a simliar example code line but different echo
for the result. Now with one XTerm:
wer...@boole:/usr/src/werner/ksh> trap "" CHLD
wer...@boole:/usr/src/werner/ksh> let n=0; for d in $(seq 1 200); do if echo
foo | grep bar; then echo oops $((n++)); fi; done
oops 0
oops 1
[...]
oops 141
oops 142
oops 143
wer...@boole:/usr/src/werner/ksh>
... The reported version of the ksh is latest 2010-03-09 nevertheless I see
this also with the local 2010-02-14.
Werner
--
"Having a smoking section in a restaurant is like having
a peeing section in a swimming pool." -- Edward Burr
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