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Date: Wed, 28 Feb 2018 16:13:28 -0800
From: Stephen Hemminger <stephen@networkplumber.org>
To: Serhey Popovych <serhe.popovych@gmail.com>
Cc: netdev@vger.kernel.org, thomas.de_schampheleire@nokia.com
Subject: Re: [PATCH iproute2 2/3] ss: Fix build with old libc headers
 without AF_VSOCK
Message-ID: <20180228161328.3067263b@xeon-e3>
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        <1519733212-30703-3-git-send-email-serhe.popovych@gmail.com>
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On Tue, 27 Feb 2018 14:06:51 +0200
Serhey Popovych <serhe.popovych@gmail.com> wrote:

> diff --git a/include/compat/libc/bits/socket.h b/include/compat/libc/bits/socket.h
> new file mode 100644
> index 0000000..25ef0d5
> --- /dev/null
> +++ b/include/compat/libc/bits/socket.h
> @@ -0,0 +1,15 @@
> +#ifndef _IP_COMPAT_BITS_SOCKET_H
> +#define _IP_COMPAT_BITS_SOCKET_H
> +
> +#include_next <bits/socket.h>
> +
> +#ifndef AF_VSOCK
> +#define PF_VSOCK	40
> +#define AF_VSOCK	PF_VSOCK
> +#undef PF_MAX
> +#undef AF_MAX
> +#define PF_MAX		41
> +#define AF_MAX		PF_MAX
> +#endif /* AF_VSOCK */
> +
> +#endif /* _IP_COMPAT_BITS_SOCKET_H */

It makes more sense to change ss.c to ifdef out the code related to AF_VSOCK
if it is not defined.  Rather than asking for unknown address family.