I have a linked list like this http://pastebin.com/bwF3jLb6 . The problem i am facing is i have initialized the list head and

 then i am doing malloc for that struct object. What i need is i want to make struct abc_st *r as head of linked list and other nodes after it.

typedef struct abc {

char client_id[18];

    char mac[18];

    st_list_head list;

}abc_st;

abc_st* check_fields (abc_st *ptr)

{

    char cmd[500];

    MYSQL_RES *result;

    MYSQL_ROW row;

    int num_rows;

    abc_st *r=NULL,*temp=NULL;

    INIT_LIST_HEAD(&r->list);   // i have intialized the head here

    sprintf(cmd, "SELECT * FROM ABCD_TABLE WHERE MAC = %.4x", ptr->mac);

        /* Running the sql query to check for fields with value in database */

    if (mysql_query(abc_db.db_handle, cmd)) {

        num_rows = -1;

        goto done;

    }

    result = mysql_store_result(abc_db.db_handle);

    if (result == NULL) {

        num_rows = -1;

        goto done;

    }

    num_rows = mysql_num_rows(result);

    while ((row = mysql_fetch_row(result)))

    {

        r= (abc_st *)malloc(sizeof(abc_st));

        memcpy(r->mac,row[1],strlen(row[1])+1);

        memcpy(r->client_id,row[0],strlen(row[0])+1);

How should i use list_add ?

        //list_add(struct list_head *new, struct list_head *head)  //prototype of list_add

       // list_add(&temp->list,&r->list);  //it will go wrong here, i want to make r(structure r as head and then add other strutcure objects)  

     //   r->link = NULL;

        //list_add(r, ptr);

    }

done:

    mysql_free_result(result);

    return r;

}