bind() system call

This is a discussion on bind() system call within the C Programming forums, part of the General Programming Boards category; hey ive copied an example from a tutorial and i wanted to know why this is working but putting an ...

  1. #1
    template<typename T> threahdead's Avatar
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    bind() system call

    hey ive copied an example from a tutorial
    and i wanted to know why this is working
    but putting an error on bind? (the error
    is "invalid argument")
    Code:
        #include <string.h>
        #include <sys/types.h>
        #include <sys/socket.h>
        #include <netinet/in.h>
    
        #define MYPORT 3490    // the port users will be connecting to
    
        #define BACKLOG 2     // how many pending connections queue will hold
    
        int main()
        {
            int sockfd, new_fd;  // listen on sock_fd, new connection on new_fd
            struct sockaddr_in my_addr;    // my address information
            struct sockaddr_in their_addr; // connector's address information
            int sin_size;
    
            sockfd = socket(AF_INET, SOCK_STREAM, 0); // do some error checking!
    
            my_addr.sin_family = AF_INET;         // host byte order
            my_addr.sin_port = htons(MYPORT);     // short, network byte order
            my_addr.sin_addr.s_addr = INADDR_ANY; // auto-fill with my IP
            memset(&(my_addr.sin_zero), '\0', 8); // zero the rest of the struct
    
            // don't forget your error checking for these calls:
            bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr));
    	if(bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == -1)
    		perror("bind");
    
            listen(sockfd, BACKLOG);
    	if(listen(sockfd, BACKLOG) == -1)
    		perror("listen");
    
            sin_size = sizeof(struct sockaddr_in);
            new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size);
    	if(accept(sockfd, (struct sockaddr *)&their_addr, &sin_size) == -1)
    		perror("accept");
    	return 0;
    }
    how would i rewrite this to see who is loggin on, when someone connects?
    thanks

  2. #2
    End Of Line Hammer's Avatar
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    Why have you doubled up all the system calls? You have two calls to bind(), two to listen() etc etc
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

  3. #3
    template<typename T> threahdead's Avatar
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    oh right thanks! fixed that..the error is gone.

    but what have i to add if i want to see when someones logges on?

    cya

  4. #4
    End Of Line Hammer's Avatar
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    Read the rest of Beej's guide

    printf("server: got connection from %s\n", inet_ntoa(their_addr.sin_addr));
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

  5. #5
    template<typename T> threahdead's Avatar
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    i will

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