Why sock.bind is always report 10048 error when in a script with multiprocessing

[Junfeng Hu]

Hi All, I'm trying to leverage my core i5 to send more UDP packets with multiprocssing, but I found a interesting thing is that the socket.bind is always reporting 10048 error even the process didn't do anything about the socket.
Here is the script

import threading,socket,random,pp,os
import time
from multiprocessing import Process
import multiprocessing.reduction

localIP='10.80.2.24'
localPort=2924
remoteIP='10.80.5.143'
remotePort=2924
sock=socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
#sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.bind((localIP,localPort))
sock.connect((remoteIP,remotePort))

addRequest="MEGACO/1 ["+localIP+"]:"+str(localPort)+"\r\nTRANSACTION = 100 {\r\n" \
"\tCONTEXT = $ {\r\n" \
"\t\tADD = TDMs15c1f1/11{ \r\n" \
" Media { LocalControl { Mode=SendReceive,tdmc/ec=on  }} " \
"\t}\r\n}}\r\n"

def sendAddRequest(sock,addRequst):
	#for i in range(2500):
	#sock.send(addRequest)
	print "hello"

		
		
if __name__ == '__main__':
	reader = Process(target=sendAddRequest,args=(sock,addRequest))
	reader.start()


Here is the output

D:\Python test>mythread2.py
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:\Python27\lib\multiprocessing\forking.py", line 346, in main
    prepare(preparation_data)
  File "C:\Python27\lib\multiprocessing\forking.py", line 461, in prepare
    '__parents_main__', file, path_name, etc
  File "D:\Python test\mythread2.py", line 12, in <module>
    sock.bind((localIP,localPort))
  File "C:\Python27\lib\socket.py", line 224, in meth
    return getattr(self._sock,name)(*args)
socket.error: [Errno 10048] Only one usage of each socket address (protocol/netw
ork address/port) is normally permitted