背景：利用socket完成一个echo服务
逻辑：

• client端发送用户输入data后，调用shutdown(SHUT_WR)实现半关闭状态
• server端接收用户发送的data，通过半关闭来判断“消息接收”是否结束
• 等待180s后将data返回给client

我有意将buffer size设置为8，让server端通过判断半关闭状态来完成消息的接收。

问题：client端在调用shutdown(SHUT_WR)后，120s内如果没有收到server端返回的信息，它就会抛出异常[Errno 10060]，认为链接中断。

1. client端为什么会在shutdown(SHUT_WR)(关闭读）后等待120s后抛出异常？
2. 如何控制这个超时时间？

代码：

• Server：

from socket import *

import time

HOST = ''
PORT = 21567
BUFSIZ = 8
ADDR = (HOST, PORT)

tcpSerSock = socket(AF_INET, SOCK_STREAM)
tcpSerSock.bind(ADDR)
tcpSerSock.listen(5)


while True:
    print 'waiting for connection...'
    tcpCliSock, addr = tcpSerSock.accept()
    print 'connected from:', addr

    data = ""
    while True:
        recv_data = tcpCliSock.recv(BUFSIZ)
        if not recv_data:
            break
        data += recv_data

    time.sleep(60 * 3)
    print 'send data:%s' % data
    tcpCliSock.send(data)

    print 'close connection:', addr
    tcpCliSock.close()

• Client:

from socket import *

HOST = 'localhost'
PORT = 21567
BUFSIZ = 8
ADDR = (HOST, PORT)


tcpCliSock = socket(AF_INET, SOCK_STREAM)
tcpCliSock.connect(ADDR)

data = raw_input('>')
tcpCliSock.send(data)

tcpCliSock.shutdown(SHUT_WR)

data = ""
while True:
    try:
        recv_data = tcpCliSock.recv(BUFSIZ)
        if not recv_data:
            break
        data += recv_data
    except Exception as e:
        print e
        break;


print data
tcpCliSock.close()