i don't understand how to run this code, can you please help me out?

In the line number 120 and 131, getsockname() and getpeername() are called. I read that it returns address the current address to which the socket is bound. But what exactly are those functions doing there. Help.

Hi,
I have a doubt about the return type here. As far as I understood, the newNode() is to add a new client in the "Client Linked List".

typedef struct ClientNode {
    int data;
    struct ClientNode* prev;
    struct ClientNode* link;
    char ip[16];
    char name[31];
} ClientList;

ClientList *newNode(int sockfd, char* ip) {
    ClientList *np = (ClientList *)malloc( sizeof(ClientList) );
    .
    .
    .

What I am confused about is that the return type of newNode() is a pointer to ClientList which is actually a variable of struct ClientNode. Shouldn't the return type be a pointer to data-type rather than an instance of a data-type itself?

Thanks for your time.

How does client is able to know when it has to read and when it has to input message