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>
> 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.
> Werner
> --
> "Having a smoking section in a restaurant is like having
> a peeing section in a swimming pool." -- Edward Burr
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