exit-ing in a trap handler uses the wrong exit code

[Loïc Minier <lool@xxxxxxxx>]

        Hi there

 qemu's configure uses a trap handler which calls exit; configure would
 call exit 1, but with the trap handler in place the configure script
 would return with exit 0.

 dash -c 'trap "sh -c \"exit 4\"; exit" 0 1 2 3 9 11 13 15;exit 3'; echo $?
 4

 Blue Swirl on the qemu-devel list points out that according to POSIX
 this should be 3:
 http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_21

 bash and zsh get this right:
 bash -c 'trap "sh -c \"exit 4\"; exit" 0 1 2 3 9 11 13 15;exit 3'; echo $?
 3

 I've logged https://bugs.launchpad.net/ubuntu/+source/dash/+bug/647450
 to track this as I'm seeing this with the Ubuntu version of dash.

   Cheers,

NB: Not subscribed to the list, please Cc: me on replies
-- 
Loïc Minier
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