[PATCH v4] linux: Add openat2 (BZ 31664)

[Paul Eggert]

On 2025-08-28 01:42, Aleksa Sarai wrote:
>> I still fail to understand how a hypothetical "give me the supported flags"
>> openat2 flag would be useful enough to justify complicating the openat2 API
>> today.
> My only concern is that it would break recompiles if/when we change it
> back.

OK, but from what I can see there's no identified possibility that 
openat2 will modify the objects its arguments point to, just as there's 
no identified possibility that plain openat will do so (in a 
hypothetical extension to remove unnecessary slashes from its filename 
argument, say).

In that case it's pretty clear that glibc should mark the open_how 
argument as pointer-to-const, just as glibc already marks the filename 
argument.