Like me you probably found Can't catch signals after an exec? which recommends using the POSIX routines. Unfortunately you have an error in your SigAction->new, you should supply a reference to the handler, not its name:
my $sigset = POSIX::SigSet->new();
my $action = POSIX::SigAction->new(
                     \&sigHUP_handler, $sigset, &POSIX::SA_NODEFER );
POSIX::sigaction(&POSIX::SIGHUP, $action);

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I reproduced a simplified version of your problem using $SIG{HUP} and this fixed it.

In reply to Re: Perl Daemons and SIGHUP by cdarke
in thread Perl Daemons and SIGHUP by explodec14

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