7、FIN-WAIT-2
处于 FIN-WAIT-1状态的连接收到 ACK 确认包以后进入FIN-WAIT-2状态，这个时候主动关闭方的 FIN 包已经被对方确认，等待被动关闭方发送 FIN 包。
客户端超时关闭,服务端在正在处理,没法关闭,客户端处于FIN-WAIT-2
客户端:
node2:/root#netstat -an | grep 8080
tcp 0 0 192.168.137.3:57075 192.168.137.2:8080 FIN_WAIT2
node2:/root/test#cat t19.py
import socket
import time
import struct
s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
# SEND_BUF_SIZE = 2
s.connect(("192.168.137.2",8080))
s.settimeout(10)
s.send('112233')
s.recv(999)
node2:/root/test#time python t19.py
Traceback (most recent call last):
File "t19.py", line 9, in <module>
s.recv(999)
socket.timeout: timed out
real 0m10.066s
user 0m0.027s
sys 0m0.021s
服务端:
node1:/root#netstat -na | grep 8080
tcp 0 0 192.168.137.2:8080 0.0.0.0:* LISTEN
tcp 1 0 192.168.137.2:8080 192.168.137.3:57075 CLOSE_WAIT
node1:/root/test#cat t2.py
# coding = utf-8
# -*- coding:utf-8 -*-
import socket
import time
BUFSIZE=1024
ip_port = ('192.168.137.2',8080)
s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)#创建套接字
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
print("Buffer size [Before]: %d" % s.getsockopt(socket.SOL_SOCKET, socket.SO_SNDBUF))
print("Buffer size [Before]: %d" % s.getsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF))
#s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
print 'alter-----------------------------------------------------------------------';
print s.getsockopt(socket.SOL_SOCKET, socket.SO_SNDBUF)
print s.getsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF)
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('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:
msg = conn.recv(BUFSIZE) #接受消息的内容
print 'xxx--------------------xxx'
print msg
print 'xxx--------------------xxx'
except Exception,err:
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 '111-----------------------111'
print msg
print '111-----------------------111'
try:
print '开始回复报文'
time.sleep(100)
conn.send('response:'+msg)
except Exception,err:
print err
#conn.send(msg.upper())#服务端发送消息
conn.close()#关闭链接
s.close()#关闭套接字