C Socket Error On Binding Address Already In Use
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Bind Socket Failed With Error Address Already In Use
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million programmers, just like 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 error address already in use python 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 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 bind address already in use linux 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 the help .. Thanks all. –TamiL Mar 4 '13 at 10:18 1 I faced the same issue when I closed the server program with client program still running. This put the socket into TIME_WAIT state. Here's an elaborate discussion of the problem: How to forcibly close a socket in TIME_WAIT? –Narendra Apr 5 at 6:10 add a comment| 4 Answers 4 active oldest votes up vote 12 down vote accepted The error usually means that the port you a
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Address Already In Use Socket
Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up C Socket program example - Error on http://stackoverflow.com/questions/15198834/bind-failed-error-address-already-in-use binding: Already in use up vote 1 down vote favorite I have the following example code for using Linux sockets: void serve_request(int newsockfd) { char buffer[256]; int n; /*if connection established then start communicating*/ bzero(buffer, 256); n=read(newsockfd, buffer, 255); if(n<0) { perror("Error reading from socket"); } printf("Here is the message: %s\n",buffer); /*write response to the client*/ n=write(newsockfd,"I got your message", 18); if(n<0) { perror("Error writing to http://stackoverflow.com/questions/27167434/c-socket-program-example-error-on-binding-already-in-use socket"); exit(1); } //close(newsockfd); } int main(int argc, char* argv) { int sockfd, newsockfd, portno, clilen; char buffer[256]; struct sockaddr_in serv_addr, cli_addr; int n; /*first call to socket function*/ sockfd=socket(AF_INET, SOCK_STREAM, 0); setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, 0, 0); if(sockfd<0) { perror("Error opening socket"); exit(1); } /*initialize socket structure*/ bzero((char*)&serv_addr, sizeof(serv_addr)); portno=5001; serv_addr.sin_family=AF_INET; serv_addr.sin_addr.s_addr=INADDR_ANY; serv_addr.sin_port=htons(portno); /*now bind the host address using bind() call.*/ if(bind(sockfd, (struct sockaddr*) &serv_addr, sizeof(serv_addr))<0) { perror("Error on binding"); exit(1); } /*now start listening for the clients, here process will go in sleep mode and will wait for the incoming connection*/ listen(sockfd, 5); clilen=sizeof(cli_addr); while(1) { /*accept actual connection from the client*/ newsockfd=accept(sockfd, (struct sockaddr*)&cli_addr, &clilen); if(newsockfd<0) { perror("Error on accept"); exit(1); } serve_request(newsockfd); } return 0; } Everything works fine with this. When I execute ./a.out it starts the socket server and waits for clients. When I exit the code using ^C it stops and returns to prompt. However, if the code was complied with the last line (//close(newsockfd);) in method void serve_request(int newsockfd) uncommented and a client had come and gone, then on pressing ^C and invoking the server again with ./a.out, it shows Error on binding: Already in use. But if I have compiled
for this is that you have stopped your server, and then re-started it right away. The sockets that were used by the first incarnation of the server are still active. This is further explained http://www.softlab.ntua.gr/facilities/documentation/unix/unix-socket-faq/unix-socket-faq-4.html in 2.7 Please explain the TIME_WAIT state., and 2.5 How do I properly close a socket?. 4.2 Why don't my sockets close? When you issue the close() system call, you are closing your interface to the socket, not the socket itself. It is up to the kernel to close the socket. Sometimes, for really technical reasons, the socket is kept alive for a few minutes after you close it. It is normal, for address already example for the socket to go into a TIME_WAIT state, on the server side, for a few minutes. People have reported ranges from 20 seconds to 4 minutes to me. The official standard says that it should be 4 minutes. On my Linux system it is about 2 minutes. This is explained in great detail in 2.7 Please explain the TIME_WAIT state.. 4.3 How can I make my server a daemon? There are two address already in approaches you can take here. The first is to use inetd to do all the hard work for you. The second is to do all the hard work yourself. If you use inetd, you simply use stdin, stdout, or stderr for your socket. (These three are all created with dup() from the real socket) You can use these as you would a socket in your code. The inetd process will even close the socket for you when you are done. If you wish to write your own server, there is a detailed explanation in "Unix Network Programming" by Richard Stevens (see 1.5 Where can I get source code for the book [book title]?). I also picked up this posting from comp.unix.programmer, by Nikhil Nair ( nn201@cus.cam.ac.uk):
I worked all this lot out from the GNU C Library Manual (on-line documentation). Here's some code I wrote - you can adapt it as necessary: #include#include #include #include #include #include #include /* Global variables */ ... volatile sig_atomic_t keep_going = 1; /* controls program termination */ /* Function prototypes: */ ... void termination_handler (int signum); /* clean up before termination */ int main (void) { ... if (chdir (HOME_DIR)) /* change to directory containing data files */ { fprintf (stderr, "`%s': ", HOME_D