def reexec(self):
        """\
        Relaunch the master and workers.
        """
        if self.pidfile is not None:
            self.pidfile.rename(self.pidfile.fname % "%s.oldbin")

        self.reexec_pid = os.fork()
        if self.reexec_pid != 0:
            self.master_name = "Old Master"
            return

        environ = self.cfg.env_orig.copy()
        fds = [l.fileno() for l in self.LISTENERS]
        environ['GUNICORN_FD'] = ",".join([str(fd) for fd in fds])

        os.chdir(self.START_CTX['cwd'])
        self.cfg.pre_exec(self)

        # exec the process using the original environnement
        os.execvpe(self.START_CTX[0], self.START_CTX['args'], environ)
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/gunicorn/arbiter.py/Arbiter.reexec/swapped operands of `%`