Thread: cross-architecture bitfields use

Am trying to use bitfields in a portable way but am not sure my solution is the best one. I could be missing something.

I am declaring the bitfields conditionally based on the target-architecture. I have something like

Code:

struct CMDInvalDevEntry {


#ifdef __BIG_ENDIAN_BITFIELD
    uint16_t devid;                /* device to invalidate */
    uint64_t reserved_1:44;   
    uint32_t type:4;               /* command type         */
#else
    uint16_t devid;                
    uint64_t reserved_1:44;
    uint32_t type:4;
#endif /* __BIG_ENDIAN_BITFIELD */


    uint64_t reserved_2;
} __attribute((packed));

Is there a better way to do this ?

Originally Posted by Salem

Bitfields are only useful for storing internal data.

It's actually for internal storage but this is some really obscure software so I guess I will go with the above approach.