'Relaunch the master and workers.'

def reexec(self):

    if (self.reexec_pid != 0):
        self.log.warning('USR2    signal    ignored.    Child    exists.')
        return
    if (self.master_pid != 0):
        self.log.warning('USR2    signal    ignored.    Parent    exists.')
        return
    master_pid = os.getpid()
    self.reexec_pid = os.fork()
    if (self.reexec_pid != 0):
        return
    self.cfg.pre_exec(self)
    environ = self.cfg.env_orig.copy()
    environ['GUNICORN_PID'] = str(master_pid)
    if self.systemd:
        environ['LISTEN_PID'] = str(os.getpid())
        environ['LISTEN_FDS'] = str(len(self.LISTENERS))
    else:
        environ['GUNICORN_FD'] = ','.join((str(l.fileno()) for l in self.LISTENERS))
    os.chdir(self.START_CTX['cwd'])
    os.execvpe(self.START_CTX[0], self.START_CTX['args'], environ)
