# demonstrates multicast udp
from threading import *
from socket import *
import time
ifaddr = '127.0.0.1'
mcaddr = '224.1.0.1'
port = 40000
def rcv():
 s = socket(AF_INET, SOCK_DGRAM)
 sopt = inet_aton(mcaddr) + inet_aton(ifaddr)
 s.setsockopt(SOL_IP, IP_ADD_MEMBERSHIP, sopt)
 s.bind(("", port))
 for i in range(3):
 msg = s.recvfrom(1024)
 print 'receiving ' + str(msg)
def snd():
 s = socket(AF_INET, SOCK_DGRAM)
 for i in range(3):
 print "sending"
 s.sendto("yo!", (mcaddr, port))
 time.sleep(1)
t1 = Thread(target=rcv, name='rcv')
t2 = Thread(target=snd, name='snd')
t1.start()
t2.start()
 	 	 
</div><div class="naked_ctrl">
<form action="/index.cgi/contrast" method="get" name="gate">
<p><a href="http://altstyle.alfasado.net">AltStyle</a> によって変換されたページ <a href="https://bugs.python.org/file1939/multicastbug.py">(-&gt;オリジナル)</a>
/ <label>アドレス: <input type="text" name="naked_post_url" value="https://bugs.python.org/file1939/multicastbug.py" size="22" /></label> <label>モード: <select name="naked_post_mode">
<option value="default">デフォルト</option>
<option value="speech">音声ブラウザ</option>
<option value="ruby">ルビ付き</option>
<option value="contrast" selected="selected">配色反転</option>
<option value="larger-text">文字拡大</option>
<option value="mobile">モバイル</option>
</select>
<input type="submit" value="表示" />
</p>
</form>
</div>