[OE-core] [PATCH][RFC] pseudo: intercept syscall() and return ENOTSUP for renameat2

[Andre McCurdy]

On Fri, Mar 30, 2018 at 10:06 PM, Seebs <seebs at seebs.net> wrote:
> That's the problem: There's no sane way to express "the size that you
> would have gotten for these arguments of unknown types"

And there I think lies the key point that you still haven't grasped.
The arguments are not of unknown types - they are all of types which
are the same size as integer registers. The syscall manpage very
clearly documents the fact that all arguments to Linux syscalls are
passed to the kernel in registers. I think you even asked me why that
was important or useful.

If there's any user space code out there which calls libc syscall()
and does not pass variables which libc syscall() (or a wrapper for it)
can unconditionally treat as a type which fits into integer registers
than it's a bug the caller. End of story.