On Mon, 05 Jan 2026 09:25:55 +0100 Thomas Weißschuh wrote:

Various UAPI headers reference 'struct sockaddr'. Currently the
definition of this struct is pulled in from the libc header
sys/socket.h. This is problematic as it introduces a dependency
on a full userspace toolchain.

Instead expose a custom but compatible definition of 'struct sockaddr'
in the UAPI headers. It is guarded by the libc compatibility
infrastructure to avoid potential conflicts.

The compatibility symbol won't be supported by glibc right away,
but right now __UAPI_DEF_IF_IFNAMSIZ is not supported either,
so including the libc headers before the UAPI headers is broken anyways.

I did not look too closely but this seems to break build of selftests
in netdev and BPF CI (netdev on AWS Linux, not sure what base BPF uses)