servers.py 文件源码

def listen(self):
        s=None
        if not self.hostname:
            self.hostname=None
        last_exc=None
        for res in socket.getaddrinfo(self.hostname, self.port, socket.AF_UNSPEC, socket.SOCK_DGRAM, 0, socket.AI_PASSIVE):
            af, socktype, proto, canonname, sa = res
            try:
                s = socket.socket(af, socktype, proto)
                s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
            except socket.error as msg:
                s = None
                last_exc=msg
                continue
            try:
                s.bind(sa)
            except socket.error as msg:
                s.close()
                s = None
                last_exc=msg
                continue
            break
        self.sock=s
        if self.sock is None:
            raise last_exc