How do I code struct sockaddr_in into a correct code from blueprint template?

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here is the reference manual code to construct socket address endpoints

struct sockaddr_in {
               sa_family_t    sin_family; /* address family: AF_INET */
               in_port_t      sin_port;   /* port in network byte order */
               struct in_addr sin_addr;   /* internet address */
           };

           /* Internet address. */
           struct in_addr {
               uint32_t       s_addr;     /* address in network byte order */
           };

however i need to code this standard blueprint; into a program from linux page
ip(7) - Linux manual page[^]

Now i will share my code and discuss what was misunderstood.

struct sockaddr_in clntsock
{
clntsock.sin_family = AF_INET
clntsock.sin_port = htons (9735)
clntsock.sin_addr = INADDR_ANY

}

the first thing i misunderstood or coded incorrectly was the clntsock function pointed to structure passing the assemly through a roulette.

What information must i place there to make it work "clntsock"?
was i missing parentheses or something?
i stillg et error od debugger there that im missing some { < ( indicatior or function

Mainly why is the original code template missing the left side structures?
does adding "clntsock" recplace them?
or how do i write the code with both so i can completely fill this tempalte?

i just dont understand why im getting syntax errors writing this simple strucutre code

what must i do to fill in these pieces if im incorrecly coding them wrong?

What I have tried:

I tried both left to right methods
but i nver was able to combine them
what method can i code them correctly?

Posted 17-Jul-20 5:56am

tricityterminal

Updated 17-Jul-20 6:08am

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k5054 · Accepted Answer · 2020-07-17T06:08:00

For one thing, it should be

C

clntsock.sin_addr.s_addr = hton(INADDR_ANY);

Here's a function that will create a socket that listens for connections to get you going:

C

int init_socket_on_port(unsigned short port)
{
    struct sockaddr_in serv_addr;
    const int one = 1;
    int sockfd;
    if( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
    {
        perror("socket()");
        return -1;
    }

    memset( &serv_addr, 0, sizeof serv_addr);
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    serv_addr.sin_port = htons(port);
    setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);

    if( bind(sockfd, (struct sockaddr *) &serv_addr, sizeof serv_addr) < 0)
    {
        perror("bind");
        close(sockfd);
        return -1;
    }

    listen(sockfd, 1);
    printf("listening ... on socket \n");
    return sockfd;
}

You'll probably want to change the error handling,as perror() may not be the right thing, and you'll still need to call accept() on the returned socket.