Method poll

Lib/multiprocessing/popen_fork.py:25–35

(self, flag=os.WNOHANG)

        return fd

    def poll(self, flag=os.WNOHANG):
        if self.returncode is None:
            try:
                pid, sts = os.waitpid(self.pid, flag)
            except OSError:
                # Child process not yet created. See #1731717
                # e.errno == errno.ECHILD == 10
                return None
            if pid == self.pid:
                self.returncode = os.waitstatus_to_exitcode(sts)
        return self.returncode

    def wait(self, timeout=None):
        if self.returncode is None: