在Debian系统上登录时运行一个简单的Python TCP服务器

Question

我想在启动时运行一个简单的服务器。我使用的操作系统是Debian 6.0。我在.profile中添加了一行以运行python脚本：python /root/desktopnavserver2.py计算机启动并登录，但出现下面的错误。当我在debian.profile中没有添加行时，脚本运行良好，我只是在控制台中自己运行脚本。任何帮助？

错误跟踪：

Traceback (most recent call last): 
    File "/root/Desktop/navserver2.py", line 39, in <module> 
    server = SocketServer.TCPServer((HOST, PORT), MyTCPHandler) 
    File "/usr/lib/python2.6/SocketServer.py", line 402, in __init__ 
    self.server_bind() 
    File "/usr/lib/python2.6/SocketServer.py", line 413, in server_bind 
    self.socket.bind(self.server_address) 
    File "<string>", line 1, in bind 
error: [Errno 98] Address already in use 

来源：

#!/usr/bin/python 

import SocketServer 
import serial 
com2 = serial.Serial(
    port = 1, 
    parity = serial.PARITY_NONE, 
    bytesize = serial.EIGHTBITS, 
    stopbits = serial.STOPBITS_ONE, 
    timeout=3, 
    xonxoff = 0, 
    rtscts = 0, 
    baudrate = 9600 
) 

class MyTCPHandler(SocketServer.BaseRequestHandler): 
    """ 
    The RequestHandler class for our server. 

    It is instantiated once per connection to the server, and must 
    override the handle() method to implement communication to the 
    client. 
    """ 


    def handle(self): 
     # self.request is the TCP socket connected to the client 
     self.data = self.request.recv(1024).strip() 
     #print "%s wrote:"%self.client_address[0] 
     #print self.data 
     # just send back the same data, but upper-cased 
     self.request.sendall(self.data.upper()) 
     com2.write(self.data) 

if __name__ == "__main__": 
    HOST, PORT = "192.168.0.200", 14052 #change to 192.168.0.200 

    # Create the server, binding to localhost on port 9999 
    server = SocketServer.TCPServer((HOST, PORT), MyTCPHandler) 

    # Activate the server; this will keep running until you 
    # interrupt the program with Ctrl-C 
    server.serve_forever() 

Answer 1

我相信.profile由每个将自身标识为登录shell的shell实例执行。可能你有多个这样的外壳。

无论如何，在您的.profile中放置单实例脚本是一个坏主意 - 这意味着您只能有一个登录会话，下一个会话会导致此错误。

Answer 2

线error: [Errno 98] Address already in use解释了它 - 找出什么在该端口在进入运行程序（提示：是.py被称为两次？）