Bind Error Address Already In Use Socket
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Unable To Bind Socket Error Errno 98 Address Already In Use
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you, helping each other. Join them; it only takes a minute: Sign up bind failed. Error: Address already in use [closed] up vote 13 down vote favorite 8 I am new in Socket programming,Linux ,C.. This is my Bind part of the Socket program //Bind if( bind(socket_desc,(struct sockaddr *)&server , sizeof(server)) < 0) { //print the address already in use linux error message perror("bind failed. Error"); return 1; } puts("bind done"); But it gives user-desktop:~/socket_programming$ ./server Socket created bind failed. Error: Address already in use I don't know how to fix this problem.. Please give me a solution.. c linux sockets share|improve this question edited Jun 17 at 8:30 Chaitanya Bapat 11815 asked Mar 4 '13 at 9:59 TamiL 1,09431230 closed as too localized by Nick, dandan78, BЈовић, EJP, Öö Tiib Mar 4 '13 at 12:08 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question. 1 Use a different port number? –Nick Mar 4 '13 at 10:01 2 Use an address that isn't already in use. –Davi
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Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users bind: address already in use mac Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a http://stackoverflow.com/questions/15198834/bind-failed-error-address-already-in-use 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 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 http://stackoverflow.com/questions/9207781/error-in-binding-port-address-already-in-use-tcp-socket-programming-in-unix "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 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
// ln is listening on :8080 err = ln.Close() // succeeds, no error if err != nil { log.Fatal(err) } ln2, err := net.Listen("tcp", ":8080") if err != nil { log.Fatal(err) // bind: address already in https://forum.golangbridge.org/t/bind-address-already-in-use-even-after-listener-closed/1510 use } I was wondering if SO_REUSEADDR had something to do with this, but as far as I know, that is already being used under the hood in the Go standard library when creating a new tcp listener. Any ideas how I can re-bind to that address without delay? jdh (Joe Henke) 2015-11-14 18:40:19 UTC #2 Hey Matt, I tried to reproduce this and did not on my mac but did on the go playground. Where did address already this happen for you? Interestingly, both on my mac and on the go playground, if you use -addr="" or change to defaultAddr to "" in the source (which I think just means it will bind to any open port, yeah?) it will never rebind to the same port, and in fact will bind to the previous attempt's port + 1. Not sure if this is significant; I don't know precisely what binding to "" is specced to do. address already in Joe matt (Matt Holt) 2015-11-14 19:09:42 UTC #3 Thanks for trying to reproduce it - next time I'll try to provide a full code sample I'm experiencing the Go playground's behavior on my Mac. But when I ran your test program on my Mac, it passed. I will look into this further in my own program. Meanwhile, I am intensely curious as to why the test fails on the Go playground... matt (Matt Holt) 2015-11-14 19:57:23 UTC #4 Okay, I've narrowed it down a little bit. This only happens for me when my program has restarted itself using exec.Command(os.Args[0], ...) and, in that command, it sets ExtraFiles to a list of file descriptors for listeners. (Similar to this method: http://grisha.org/blog/2014/06/03/graceful-restart-in-golang/) This lets the child process (itself) use the existing listeners without downtime. In the "restarted" process, then: I close the listeners, immediately create new ones on the same addresses again, and it fails with "address already in use". But if I pause 5 seconds after closing the listener (before creating the new listener), it succeeds. The original process where the listeners were created don't have this problem. In other words, if I don't "restart" the process, I can close and create the listeners immediately, like @jdh's program does. But if I do that same thing in a restart, it doesn't work. Here's a program that reproduces what I'm describing: gist.github.com https://gist.github.com/mholt/54caa1190cc6b14a43b1 socke