Are you sure about that? I don't think that signal handlers persist across an exec (though it seems that the signal mask does; see the below update). They didn't in my short test: 
$SIG{INT} = $SIG{HUP} = sub {};
exec qw(/bin/sleep 5)
    or die 'exec failed';

[download]
I was able to interrupt that with CTRL-C, even though I ignored SIGINT in the child process.

Update: Well, the above apparently worked for the OP, though it still doesn't work for me. Maybe it's OS-dependent; I'm testing on Linux.

Update: Kudos to pileofrogs for pointing out below that setting the signal handlers to the string IGNORE works perfectly! It seems that the signal mask persists across an exec, but signal handlers don't, which basically makes sense. So this code works on my system: 

$SIG{INT} = $SIG{HUP} = 'IGNORE';
exec qw(sleep 5)
    or die 'exec failed';

[download]

In reply to Re^2: protect children from SIG{INT} by sgifford
in thread protect children from SIG{INT} by pileofrogs

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