Socket error 98 "Address already in use"
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From: AK on 17 Jun 2010 19:21 Hi, I'm trying to make a little mp3 server / client and I'm running into a problem with the Socket error 98 "Address already in use". The error doesn't happen right away, I can send 3-4 commands, disconnecting and reconnecting and they work fine and then I get this error and the client can no longer connect, although the client side doesn't get any errors. Here's the relevant code: s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) s.bind((HOST, PORT)) s.listen(1) conn, addr = s.accept() try: self.player(conn, addr) except: pass conn.close() s.close() del s ... and on client: HOST = '' PORT = 50025 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) s.connect((HOST, PORT)) Thanks! -ak
From: AK on 17 Jun 2010 19:28 On 06/17/2010 07:21 PM, AK wrote: > Hi, I'm trying to make a little mp3 server / client and I'm running into > a problem with the Socket error 98 "Address already in use". The error > doesn't happen right away, I can send 3-4 commands, disconnecting and > reconnecting and they work fine and then I get this error and the client > can no longer connect, although the client side doesn't get any errors. > Here's the relevant code: > > s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) > s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) > s.bind((HOST, PORT)) > s.listen(1) > conn, addr = s.accept() > try: self.player(conn, addr) > except: pass > conn.close() > s.close() > del s > > > .. and on client: > > > HOST = '' > PORT = 50025 > s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) > s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) > s.connect((HOST, PORT)) > > > Thanks! -ak I forgot to add that I'm on Ubuntu 9.10 and using python 2.6. -ak
From: Grant Edwards on 17 Jun 2010 20:19 On 2010-06-17, AK <ak(a)nothere.com> wrote: > Hi, I'm trying to make a little mp3 server / client and I'm running into > a problem with the Socket error 98 "Address already in use". The error > doesn't happen right away, I can send 3-4 commands, disconnecting and > reconnecting and they work fine and then I get this error and the client > can no longer connect, although the client side doesn't get any errors. > Here's the relevant code: > > s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) > s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) > s.bind((HOST, PORT)) > s.listen(1) > conn, addr = s.accept() > try: self.player(conn, addr) > except: pass > conn.close() > s.close() > del s Always, always, always: post the traceback. If that's your server code, I don't see how you can disconnect and reconnect. That code only accepts a single connection, then it's done. Also always: post minim but real code the shows the problem. -- Grant
From: AK on 17 Jun 2010 20:24 On 06/17/2010 08:19 PM, Grant Edwards wrote: > On 2010-06-17, AK <ak(a)nothere.com> wrote: >> Hi, I'm trying to make a little mp3 server / client and I'm running into >> a problem with the Socket error 98 "Address already in use". The error >> doesn't happen right away, I can send 3-4 commands, disconnecting and >> reconnecting and they work fine and then I get this error and the client >> can no longer connect, although the client side doesn't get any errors. >> Here's the relevant code: >> >> s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) >> s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) >> s.bind((HOST, PORT)) >> s.listen(1) >> conn, addr = s.accept() >> try: self.player(conn, addr) >> except: pass >> conn.close() >> s.close() >> del s > > Always, always, always: post the traceback. Here it is: Traceback (most recent call last): File "./vimp3_player.py", line 112, in <module> Player().main() File "./vimp3_player.py", line 35, in main self.listen() File "./vimp3_player.py", line 41, in listen s.bind((HOST, PORT)) File "<string>", line 1, in bind socket.error: [Errno 98] Address already in use > > If that's your server code, I don't see how you can disconnect and > reconnect. That code only accepts a single connection, then it's done. It's in a while 1: loop. self.player() just takes in a single command and then returns. > > Also always: post minim but real code the shows the problem. It'd be a bit difficult to separate it, I was hoping this is a known issue and this description would be enough, but if that turns out not to be the case I'll make a minimal working example. Thanks for the reply! -ak
From: Grant Edwards on 17 Jun 2010 20:59
On 2010-06-18, AK <ak(a)nothere.com> wrote: > Here it is: > > Traceback (most recent call last): > File "./vimp3_player.py", line 112, in <module> > Player().main() > File "./vimp3_player.py", line 35, in main > self.listen() > File "./vimp3_player.py", line 41, in listen > s.bind((HOST, PORT)) > File "<string>", line 1, in bind > socket.error: [Errno 98] Address already in use Setting the SO_REUSEADDR option should prevent that, and in my experience it always does. What OS are you using? Is there some reason you want to rebind each time? Why not just loop around the conn,addr = accept() .... con.close() section? > It'd be a bit difficult to separate it, I was hoping this is a known > issue and this description would be enough, but if that turns out not to > be the case I'll make a minimal working example. It is a known issue, but it's solved by setting the REUSEADDR option on the socket before calling bind(). Are you sure you don't somehow leave a server running on that port that prevents the bind() from working? -- Grant |