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

[Paul Eggert]

On 2025-08-26 06:03, Aleksa Sarai wrote:
> Is removing const something we can do safely? I was under the impression
> removing const from a function prototype can break building working
> programs? (Even if they wouldn't be using the feature.)

How so? Can you give a sample call that would break?

> But there is precedent for the CHECK_FIELDS approach
> -- sched_setattr(2) and perf_event_open(2) both write to the size field

None of these are in glibc. And this is a confusing design. And there is 
no good performance reason for it. Syscalls should instead use the POSIX 
standard model of sigaction etc.

The glibc API can have two arguments even if the Linux syscall is poorly 
designed and has just one.