18.5 TCP的半关闭

18.5 TCP的半关闭


TCP提供了连接的一端的结束它的发送后还能接收另一端数据的能力。

这就是所谓的半关闭

print(socket.SHUT_RDWR)
print(socket.SHUT_RD)
print(socket.SHUT_WR)

2
0
1


0是READ,1是WRITE,2是READ WRITE






如果应用程序不调用c l o s e而调用s h u t d o w n，且第2个参数值为1，则插口的A P I支持
半关闭。然而，大多数的应用程序通过调用close终止两个方向的连接。

node1:/root/test#cat t2.py 
# coding = utf-8
# -*- coding:utf-8 -*-
import socket
ip_port = ('192.168.137.2',8080)
BUFSIZE = 1000
s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)#创建套接字
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind(ip_port)#绑定地址
s.listen(5)#监听链接
print('server listening8080...')
while True: #无限等待连接
    conn,addr = s.accept() #接受客户端连接
    print(conn)
    print(addr)
    print('接到来自%s的链接'%addr[0])
    while True: #通信循环，无限接受客户端信息
        #print conn.getpeername()
        try:
         peeraddr=conn.getpeername()
         msg = conn.recv(BUFSIZE) #接受消息的内容
        except:
          break;
        if len(msg)==0:break  #如果 不加，已连接的客户端突然断开，recv不再阻塞发生死循环
        print '-----------------------'
        print msg
        print '-----------------------'
        try:
         conn.send('response:'+msg)
        except:
          print '555555555'
        #conn.send(msg.upper())#服务端发送消息
    conn.close()#关闭链接
s.close()#关闭套接字




import socket
import time
s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
s.connect(("192.168.137.2",8080))
s.settimeout(10)
s.send('3232344dd')

#print s.getsockopt()
print s.getsockname()
print s.getpeername()
#s.sendall("this is shutdown test" + "\r\n")
print dir(socket.herror)
print(socket.SHUT_RDWR)
print(socket.SHUT_RD)
print(socket.SHUT_WR)
#print s.recv(90)
s.send('2121212121')

print s.recv(90)
s.shutdown(1)
#time.sleep(10)
#print s.recv(90)
time.sleep(30)
#s.send('xxxxxxxx')
print s.recv(90)
s.send('99999888')
# while (1==1):
#     print s.recv(90)




C:\Python27\python.exe C:/Users/TLCB/PycharmProjects/untitled2/http/t5.py
('192.168.137.1', 58945)
('192.168.137.2', 8080)
['__class__', '__delattr__', '__dict__', '__doc__', '__format__', '__getattribute__', '__getitem__', '__getslice__', '__hash__', '__init__', '__module__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__setstate__', '__sizeof__', '__str__', '__subclasshook__', '__unicode__', '__weakref__', 'args', 'errno', 'filename', 'message', 'strerror']
2
0
1
response:3232344dd
Traceback (most recent call last):
  File "C:/Users/TLCB/PycharmProjects/untitled2/http/t5.py", line 26, in <module>
    s.send('99999888')
socket.error: [Errno 10058] 
response:2121212121

Process finished with exit code 1