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```
$SIG{HUP} = \&doSigHup;
```

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use POSIX ();
$sigset=POSIX::SigSet->new();
$action=POSIX::SigAction->new('doSigHup',$sigset,&POSIX::SA_NODEFER);
POSIX::sigaction(&POSIX::SIGHUP, $action);