Re: wait with trap SIGCHLD: different behaviour in 3.2 and 4.0

[Chet Ramey]

powerman@powerman.name wrote:

> Bash Version: 4.0
> Patch Level: 28
> Release Status: release
> 
> Description:
>         Looks like 'wait' command in bash-4 is broken: if used together
>         with 'trap myhandler SIGCHLD' the 'wait' (without params) exit
>         just after receiving first child exit, instead of waiting for all
>         childs exit.

Posix requires this behavior.

"When the shell is waiting, by means of the wait utility, for asynchronous
commands to complete, the reception of a signal for which a trap has been
set shall cause the wait utility to return immediately with an exit status
>128, immediately after which the trap associated with that signal shall be
taken."

This was reported as a bug against bash-3.2.

Chet

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    chet@case.edu    http://cnswww.cns.cwru.edu/~chet/