On Mon, Mar 29, 2010 at 11:08:37AM +0200, Werner Fink wrote:
> Hi,
>
> 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>
>
> and repeating the loop results in different numbers of reports
> showing that there is a race as there should no report at all.
>
> Beside this setting the trap to something not empty works like
>
> ksh> trap ";" CHLD
> let n=0; for d in $(seq 1 200); do if echo foo | grep bar; then echo oops
> $((n++)); fi; done
> ksh>
>
> which is very strange. It is very common to use an
> empty string for traps used for ignoring signals, though.
Are there any news?
Werner
--
"Having a smoking section in a restaurant is like having
a peeing section in a swimming pool." -- Edward Burr
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