Bind Error Address Already In Use C
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Address Already In Use Socket
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 error message perror("bind failed. Error"); return 1; } puts("bind
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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. –David Schwartz Mar 4 '13 at 10:02 I got it.. I choose different ports... Thanks for
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Bind: Address Already In Use Mac
Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions bind: address already in use docker Jobs Documentation Tags Users 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. http://stackoverflow.com/questions/15198834/bind-failed-error-address-already-in-use 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 forums and I'm new to socket programming. Major parts of my code are similar to BIND ERROR : Address already in use but then http://stackoverflow.com/questions/9207781/error-in-binding-port-address-already-in-use-tcp-socket-programming-in-unix 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 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 An
and both ends must ACK (acknowledge) each other's FIN packets. The FIN packets are initiated by the application performing a close(), a shutdown(), or an exit(). The ACKs are handled by the kernel after the close() http://hea-www.harvard.edu/~fine/Tech/addrinuse.html has completed. Because of this, it is possible for the process to complete before the kernel has released the associated network resource, and this port cannot be bound to another process until the kernel has decided that it http://developerweb.net/viewtopic.php?id=4605 is done. Figure 1 Figure 1 shows all of the possible states that can occur during a normal closure, depending on the order in which things happen. Note that if you initiate closure, there is a TIME_WAIT state that address already is absent from the other side. This TIME_WAIT is necessary in case the ACK you sent wasn't received, or in case spurious packets show up for other reasons. I'm really not sure why this state isn't necessary on the other side, when the remote end initiates closure, but this is definitely the case. TIME_WAIT is the state that typically ties up the port for several minutes after the process has completed. The length of the associated timeout address already in varies on different operating systems, and may be dynamic on some operating systems, however typical values are in the range of one to four minutes. If both ends send a FIN before either end receives it, both ends will have to go through TIME_WAIT. Normal Closure of Listen Sockets A socket which is listening for connections can be closed immediately if there are no connections pending, and the state proceeds directly to CLOSED. If connections are pending however, FIN_WAIT_1 is entered, and a TIME_WAIT is inevitable. Note that it is impossible to completely guarantee a clean closure here. While you can check the connections using a select() call before closure, a tiny but real possibility exists that a connection could arrive after the select() but before the close(). Abnormal Closure If the remote application dies unexpectedly while the connection is established, the local end will have to initiate closure. In this case TIME_WAIT is unavoidable. If the remote end disappears due to a network failure, or the remote machine reboots (both are rare), the local port will be tied up until each state times out. Worse, some older operating systems do not implement a timeout for FIN_WAIT_2, and it is possible to get stuck there forever, in which case restarting your server could require a reboot. If the local application dies while a connection is active, the port wi
#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) { 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 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: 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 time i login to new machine, my code is wo