如何在C中实现指针功能？

Question

目前，我正在构建一个API，以便我可以使用创建的函数轻松连接到套接字。

目前，我有一个代码：

int main(int argc, char *argv[]) {
    ...

        //Assume bind() and listen() successfully returned.

        //print message to show connection has been made
        printf("Ready and Listening...\n");

        //keep server alive with while loop
        while(1) { ///////This is where a thread comes in and accept() connection
            //accept incoming connections
            connection = (connection_t *)malloc(sizeof(connection_t));
            connection->addr_len = sizeof(&connection->address);
            connection->sock = accept(socket_file_descriptor, (struct sockaddr *)&connection->address, &connection->addr_len);
            connection->addr = (long)((struct sockaddr_in *)&connection->address)->sin_addr.s_addr;
            connection->client_port_number = ntohs(((struct sockaddr_in *)&connection->address)->sin_port);


            if(getsockname(connection->sock,&connection->address, &connection->addr_len) == -1) {
                printf("Error getting client socket address: %s\n", strerror(errno));
            } else {
                //client_port_number = ntohs((struct sockaddr_in *)&connection->address).sin_port);
            }

            if(connection->sock <= 0) {
                error("ERROR on accept");
                free(connection);
            } else {
                //pthread is created so that each connection established is managed by individual thread, and pthread function is invoked here
                if(pthread_create(&thread, 0, pthread, (void *)connection) < 0)
                    error("ERROR creating thread");
                printf("Thread Created... Listening on Client:[%d.%d.%d.%d:%d]\n",
            (int)((connection->addr    ) & 0xff),
            (int)((connection->addr>> 8) & 0xff),
            (int)((connection->addr>>16) & 0xff),
            (int)((connection->addr>>24) & 0xff),
            connection->client_port_number);
            pthread_detach(thread);
            }
        }
     return 0;
 }

while循环是我的服务器开始接受连接的地方。 如果建立了任何连接，则调用（void * pthread）函数来处理单个连接。

这里是参考的线程函数：

void * pthread(void * ptr) {
    char buffer[256];
    int n;
    char m1[2], m2[10];
    connection_t *conn;
    char *fname;

    if(!ptr) pthread_exit(0);
    conn = (connection_t *) ptr;

    bzero(buffer,256);
    //read message
    n = read(conn->sock, buffer, 255);
    sscanf(buffer,"%[^ ] %s",m1,m2);

    printf("%s\n",m2);
    if(n > 0) {

        //SEND TO CLIENT
        if(strcmp(m1, "get") == 0) {
            if (strcmp(m2, "file") == 0) {

                fname = "tosendfromserver.txt";
                sender(fname,conn->sock);
                printf("file [\"%s\"] has been sent to [%d.%d.%d.%d:%d]\n", fname,
            (int)((conn->addr     ) & 0xff),
            (int)((conn->addr >>     8) & 0xff),
            (int)((conn->addr >>    16) & 0xff),
            (int)((conn->addr >>    24) & 0xff),
            conn->client_port_number);
            }
        }
    }
    close(conn->sock);
    free(conn);
    pthread_exit(0);
}

因此，pthread函数处理连接，并发送客户端响应。 我现在正在修改它，以便我可以使用简单的函数：

int main(int argc, char * argv[]) { //argv[0] == server //argv[1] == port number

    listenv = setServer(argv[1],&serverAddress,&sfd);
                //int port = ntohs(serverAddress.sin_port);
                printf("sfd = %d port = %d\n", sfd, ntohs(serverAddress.sin_port));
                printf("listenv = %d\n",listenv);
    while (listenv == 0) {

        connection_t conn;
        if (connector(&conn,&sfd) == 1){

        }
    }
}

其中connector（）允许我使用线程连接到连接，如上面的代码所示。

我如何实现connector（）以允许这种情况发生？

之后，我想做类似的事情：

while (listenv == 0) {

        connection_t conn;
        if (**connector(&conn,&sfd**) == 1){
            n = read(conn->sock, buffer, 255);
            sscanf(buffer,"%[^ ] %s",m1,m2);

            printf("%s\n",m2);
            if(n > 0) {
                //SEND TO CLIENT
                if(strcmp(m1, "get") == 0) {
                    if (strcmp(m2, "file") == 0) {

                        fname = "tosendfromserver.txt";
                        sender(fname,conn->sock);
                        printf("file [\"%s\"] has been sent to [%d.%d.%d.%d:%d]\n", fname,
            (int)((conn->addr     ) & 0xff),
            (int)((conn->addr >>     8) & 0xff),
            (int)((conn->addr >>    16) & 0xff),
            (int)((conn->addr >>    24) & 0xff),
            conn->client_port_number);
                    }
                }
        }

任何人都可以帮我解决这个问题吗？