Make ip.h and tcp.h work under -fnative-struct or -fms-bitfields

Danny Smith
Mon Oct 28 01:24:00 GMT 2002

 --- Wu Yongwei <> wrote: > These header files use "u_int xxx:4,
yyy:4", which in the MS convetion
> will generate 4-byte instead of 1-byte bit fields.
> ChangeLog:
> 2002-10-28  Wu Yongwei <>
> 	* ip.h (struct ip): Use u_char to indicate bitfields to make it
> 	work with -fnative-struct/-fms-bitfields.
> 	(struct ip_timestamp): Ditto.
> 	* tcp.h (struct tcphdr): Ditto.

Changing types like that can cause problems.
Wouldn't it be better to just use __attribute__((packed)) to pack the fields?
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