On Wed, 26 Jun 2002, Manoj wrote:
> Hello all,
>
> While going through Linux USB code I found declarations like:
>
> struct usb_config_descriptor {
> __u8 bLength __attribute__ ((packed));
> __u8 bDescriptorType __attribute__ ((packed));
> __u16 wTotalLength __attribute__ ((packed));
> __u8 bNumInterfaces __attribute__ ((packed));
> __u8 bConfigurationValue __attribute__ ((packed));
> __u8 iConfiguration __attribute__ ((packed));
> __u8 bmAttributes __attribute__ ((packed));
> __u8 MaxPower __attribute__ ((packed));
> }
>
> Can anybody tell me the difference between __u8 and u8
> what is meant by __attribute__ ((packed))
>
> Is this some kernel level stuff. If I want to use this declarations at user
> level how do I need to change these.
You should never use kernel definitions in user code. Linus said so.
Jon
>
> Thanks
>
> Manoj
>
>
>
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