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Re: Bug when trapping exit from subshell


From: Maarten Billemont
Subject: Re: Bug when trapping exit from subshell
Date: Sat, 17 May 2014 00:48:52 -0400

the exit handler is called, you just muted it.  remove the redirections,
and you'll also notice you need a space after your !


On 16 May 2014 12:41, Mark Ferrell <address@hidden> wrote:

> The following script properly reports the exit code to the calling
> environment, , but the exit handler is not called if a function
> triggers the exit vs an external command.
>
> Script executed via:
> bash <script> false;echo $?
> bash <script> /bin/false;echo $?
>
> Expected the function 'exit_handler()' to be called in both cases.
> When using bash, exit_handler() was only called in the '/bin/false' case.
>
> Note: this behaviour is only seen in bash (tested on 4.1.2 on CentOS
> 6.5 and 4.2.25 on Ubuntu 12.04).  The following shells where also
> tested and all behaved as expected (i.e. the exit handler was called):
> ksh, dash, BusyBox's ash, and zsh.
>
> Script:
> set -e
> exit_handler() { echo "exit code: $?"; }
> false() { !:; }
>
> main()
> {(
>     trap exit_handler 0
>     "$@" >> /dev/null 2>&1
> )}
> main "$@"
> echo "after main"
>
>


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