Bind Error Address Already In Use Unix Domain Socket
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Bind Failed Address Already In Use Iperf
already in use” error using Unix socket up vote 2 down vote favorite 1 Writing the C source below using Unix local sockets I got an error about the address already in use. After having checked man 7 Unix for further informations
So_reuseaddr Example In C
I tried to create a sub-folder where executing my program (obviously modifying the sun_path field on the current folder) but the error was ever the same. Is there someone able to help me? The source code can be found here: Pastebin c sockets unix-socket share|improve this question asked Jul 3 '13 at 15:23 none 317315 please post the exact error message you are seeing. –xaxxon Jul 3 '13 at 15:28 The error displayed is this: "Error "Address already in use" in create unix socket file bind()" –none Jul 3 '13 at 15:31 hey, DO NOT use a dropbox filesystem for AF_UNIX. It really needs to be a local filesystem. You can google around for why. Here there be dragons, so until you try it on a local filesystem and reproduce it, I don't think anyone can help you. –xaxxon Jul 3 '13 at 15:32 It sounds pretty strange, since the Dropbox folder is located on my filesystem. Anyway I'm gonna try it. –none Jul 3 '13 at 15:36 1 also, are you making sure to unlink the file if it exists? beej.us/guide/bgipc/output/html/multipage/unixsock.html –xaxxon Jul 3 '13 at 15:40 | show 2 more comments 2 Answers 2 active oldest votes up vote 7 down vote accepted You should unlink() the path file before bind call. You will get this error when file exists during the bind. Either you should ensure to unlink/remove the file before exiting the application or you could always unlink it before bind. Check man page of bind. Also, note the example given in the man page at the end. share|improve this answer edited Nov 18 '13 at 9:54 answered Jul 3 '13 at 15:39 VoidPointer 2,356920 1 yeah, I just saw this, too –xaxxon Jul 3 '13 at 15:41 Yes, just tried and it works. Anyway, thanks to both and +1 to xaxxon. –none Jul 3 '13 at 15:49 add a comment| up vote -4 down vote You can try to use the SO_REUSEADDR flag like so:
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Sockaddr_un
more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags port already in use Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, close socket linux helping each other. Join them; it only takes a minute: Sign up error in binding port “Address already in use” TCP socket programming in unix up vote 2 down vote favorite 3 I've gone through many posts and http://stackoverflow.com/questions/17451971/getting-address-already-in-use-error-using-unix-socket forums and I'm new to socket programming. Major parts of my code are similar to BIND ERROR : Address already in use but then i changed my code so that i include "setsockopt" function like so: const char* port="5555"; int opt=1; portno=atoi(port); //parameters for server address serv_addr.sin_family=AF_INET; serv_addr.sin_port=htons(portno); serv_addr.sin_addr.s_addr=INADDR_ANY; //bind the socket to the address setsockopt(sockfd,SOL_SOCKET,SO_REUSEADDR,(const char *)&opt,sizeof(int)); if(bind(sockfd,(struct sockaddr*)&serv_addr,sizeof(serv_addr))<0) {close(sockfd); error("error in binding port!"); } But still i get the error. I have to close the http://stackoverflow.com/questions/9207781/error-in-binding-port-address-already-in-use-tcp-socket-programming-in-unix terminal and restart it in order to use the port again. I want to use a hardcoded port (like i mentioned in the code above) Thanks a lot in advance c sockets unix tcp share|improve this question edited Feb 9 '12 at 8:56 Joachim Pileborg 209k15138247 asked Feb 9 '12 at 8:53 arvind 501311 Check the value returned by setsockopt. –cnicutar Feb 9 '12 at 8:56 Are you sure you don't have a lingering process somewhere? –Laur Ivan Feb 9 '12 at 8:56 return value of setsockopt is 0 when the binding fails,however if the server is up then the return value is not displayed. –arvind Feb 9 '12 at 9:38 add a comment| 2 Answers 2 active oldest votes up vote 1 down vote accepted A port number can only be used by one application at a time. That means you can not start the same program twice expecting both to bind to the same port. The SO_REUSEADDR is for when the socket bound to an address has already been closed, the same address (ip-address/port pair) can be used again directly. share|improve this answer answered Feb 9 '12 at 8:59 Joachim Pileborg 209k15138247 in my code (as mentioned above) i put the condition to close the socket in case the binding fails. Also I checked the return value
#1 2006-09-07 08:05 AM kiranmai Member Registered: 2006-09-07 Posts: 2 Re: Bind() failed: Address already in use Hi, I am getting Bind Failed: Address already in use I have added int yes=1; if (setsockopt(gTestSocket,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(int)) == -1) { http://developerweb.net/viewtopic.php?id=4605 perror("setsockopt"); return FALSE; } Still Iam getting the same error. Offline Quote #2 2006-09-07 01:15 PM RobSeace Administrator From: Boston, MA Registered: 2002-06-12 Posts: 3,822 Website Re: Bind() failed: Address already in use Then, you probably have some other program (maybe another copy of the same one?) already bound to that port... Do "netstat -a" and look for it... Setting SO_REUSEADDR only lets you already in bind() if there are no other truly active listening sockets for that port... Typically, the only real use for it is to be able to bind() when there are still TIME_WAIT state sockets bound to that port, from a previous incarnation of the server... But, it won't let two active apps bind() to the same port (on the same IP), if that's what you're trying to do... Offline Quote #3 2006-09-08 05:21 AM kiranmai Member Registered: 2006-09-07 Posts: 2 Re: Bind() failed: already in use Address already in use Hi RobSeace Thanks for your reply. Actually i have terminated the program abnormally using ctrl+z. So the socket was not closed. Now if I run the program again it gives bind() failed:address already in use. when i do netstat -a it gives that, that particular socket is connected but not listening. I think i need to do some clean up to close the socket when the program terminated abnormally.. Is there any unix command that kills or closes the socket from command prompt. Offline Quote #4 2006-09-08 01:17 PM RobSeace Administrator From: Boston, MA Registered: 2002-06-12 Posts: 3,822 Website Re: Bind() failed: Address already in use Well, in most shells, CTRL-Z doesn't terminate an app, but rather suspends it... Ie: it's still alive, but just 'stopped', and can be restarted again with "bg" or "fg"... So, your app is still alive and holding the socket open... If your app truly terminated, then the OS would've closed the socket for you automatically... Is there any unix command that kills or closes the socket from command prompt. Well, it doesn't make sense to talk about killing a socket... You can kill the app that has the socket open, however... Just use "kill" or "killall" or whatever... Doing that will close the socket... Offline Quote #5 2007-02-19 04:11 PM kumar_1122 Member Registered: 2006-12-29 Posts: 14 Re: Bind() failed: Address already in use Hi all, I am also facing similar kind of problem. Every