#define EXEC /* the server is to be exec() */

#define DES_LENG 40

typedef struct
{
    int bar_code;
    float unit_price;
    int quantity;
    char description[DES_LENG];
} RECORD;

typedef struct
{
    int bar_code;
    int quantity;
} MESSAGE;

typedef struct
{
    int error;
    float unit_price;
    char description[DES_LENG];    
} R_MESSAGE;