Linux Bind Error Address Already In Use
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Bind Address Already In Use Ssh
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 error message perror("bind failed. Error"); return 1; } puts("bind done"); But it address already in use socket 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 12315 asked Mar 4 '13 at 9:59 TamiL 1,09931230 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. –David Schwartz Mar 4 '13 at 10:02 I got it.. I choose different ports... Thanks for the help .. Thanks all. &nda
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about address already in use python Stack Overflow the company Business Learn more about hiring developers or posting ads with bind: address already in use mac us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is describe how bind function works. a community of 6.2 million programmers, just like you, 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 http://stackoverflow.com/questions/15198834/bind-failed-error-address-already-in-use 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 "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)); http://stackoverflow.com/questions/9207781/error-in-binding-port-address-already-in-use-tcp-socket-programming-in-unix 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 212k15144255 asked Feb 9 '12 at 8:53 arvind 551311 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
communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business http://askubuntu.com/questions/447820/ssh-l-error-bind-address-already-in-use Learn more about hiring developers or posting ads with us Ask Ubuntu Questions Tags Users Badges Unanswered Ask Question _ Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a https://forum.golangbridge.org/t/bind-address-already-in-use-even-after-listener-closed/1510 minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top ssh -L (error: bind: Address already in use) up vote 9 down vote address already favorite 5 Pretty simple, I know that this has happened to me before. Couldn't find a good answer on AU. I was running an ssh session with ports bound: ssh -L 3000:
// 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 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 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. 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 socket_reuse.go package main import ( "flag" "log" "net" "os" "os/exec" ) This file has been truncated. show original The erroring line is line 44. Are you seeing the s