On Sat, Sep 19, 2015 at 10:26 PM, Gunjan Mehta <gunjanmehta08@xxxxxxxxx> wrote: > 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; huh? this is initialized? > 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; > > } > > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > -- ---P.K.S _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
