客户端关闭写后,继续写数据socket.error: [Errno 32] Broken pipe

Broken pipe出现的时机是：在一个 RST 的套接字继续写数据，就会出现Broken pipe。
下面来模拟 Broken pipe 的情况，服务端代码非常简单，几乎什么都没做，完整的代码见：
node2:/root#tcpdump -S -i eth1 '((tcp) and  (host 192.168.137.3) and (port 8080) )'
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes
00:27:57.885816 IP node2.56882 > node1.webcache: Flags [S], seq 2109269905, win 14600, options [mss 1460,sackOK,TS val 11592824 ecr 0,nop,wscale 7], length 0
00:27:57.886043 IP node1.webcache > node2.56882: Flags [S.], seq 2673199318, ack 2109269906, win 14480, options [mss 1460,sackOK,TS val 1448873 ecr 11592824,nop,wscale 6], length 0
00:27:57.886055 IP node2.56882 > node1.webcache: Flags [.], ack 2673199319, win 115, options [nop,nop,TS val 11592824 ecr 1448873], length 0
00:27:57.886125 IP node2.56882 > node1.webcache: Flags [P.], seq 2109269906:2109269915, ack 2673199319, win 115, options [nop,nop,TS val 11592824 ecr 1448873], length 9
00:27:57.886163 IP node2.56882 > node1.webcache: Flags [F.], seq 2109269915, ack 2673199319, win 115, options [nop,nop,TS val 11592824 ecr 1448873], length 0
00:27:57.886186 IP node1.webcache > node2.56882: Flags [.], ack 2109269915, win 227, options [nop,nop,TS val 1448873 ecr 11592824], length 0
00:27:57.886463 IP node1.webcache > node2.56882: Flags [P.], seq 2673199319:2673199337, ack 2109269916, win 227, options [nop,nop,TS val 1448873 ecr 11592824], length 18
00:27:57.886475 IP node2.56882 > node1.webcache: Flags [R], seq 2109269916, win 0, length 0
00:27:57.886501 IP node1.webcache > node2.56882: Flags [F.], seq 2673199337, ack 2109269916, win 227, options [nop,nop,TS val 1448873 ecr 11592824], length 0
00:27:57.886507 IP node2.56882 > node1.webcache: Flags [R], seq 2109269916, win 0, length 0

node2:/root/test#cat t13.py 
import socket
import struct
import time
s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.setsockopt(socket.SOL_SOCKET, socket.SO_LINGER, struct.pack('ii', 1, 0))
s.connect(("192.168.137.2",8080))
s.send('111111111')
s.shutdown(2)
s.send('111111111')
s.send('111111111')
s.send('111111111')

node2:/root/test#python t13.py 
Traceback (most recent call last):
  File "t13.py", line 10, in <module>
    s.send('111111111')
socket.error: [Errno 32] Broken pipe