>> 	struct iovec_f {
>> 	  union {
>> 	    void *iovu_base_r;
>> 	    const void *iovu_base_w;
>> 	  } iov_u;
>> #define iov_base_r iov_u.iovu_base_r
>> #define iov_base_w iov_u.iovu_base_w
> add:
> #define iov_base iov_u.iovu_base_r
> and you could make this change right now, without changing the api
> for existing programs.

Or the abi, assuming the union works "normally".

Duh.  I feel stupid for not noticing that myself.  Thank you.

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