Hi,

> Date: 2026-10-21 23:07:53+0200
> From: Günther Noack <gnoack3000@gmail.com>
>
> The option is implemented through proto_ops->set_peek_off, which is
> nowadays also set for UDP and TCP sockets:
> 
> 	linux.git 627d2d6b5500 (2016-04-05; "udp: enable MSG_PEEK at non-zero offset")
> 		Linux 4.7, UDP over IPv4 and IPv6
> 	linux.git 05ea491641d3 (2024-04-11; "tcp: add support for SO_PEEK_OFF socket option")
> 		Linux 6.10, TCP over IPv4
> 	linux.git be9a4fb831b8 (2024-08-29; "tcp: add SO_PEEK_OFF socket option tor TCPv6")
> 		Linux 6.12, TCP over IPv6
> 
> Cc: Jon Maloy <jmaloy@redhat.com>
> Cc: samanthakumar <samanthakumar@google.com>
> Cc: Kuniyuki Iwashima <kuniyu@google.com>
> Assisted-by: LLM
> Signed-off-by: Günther Noack <gnoack3000@gmail.com>

Reviewed-by: Alejandro Colomar <alx@kernel.org>

> ---
> 
> Notes:
>     Double checked in code -- this feature has been added to these other
>     protocols since that man page section was written; I made sure that we
>     have all relevant commits listed as comments in the man page source.

Actually, I prefer them in the commit message.  These days of git(1),
the comments in the source code are less useful and more noise.


Cheers,
Alex

> 
>  man/man7/socket.7 | 16 +++++++++++++---
>  1 file changed, 13 insertions(+), 3 deletions(-)
> 
> diff --git a/man/man7/socket.7 b/man/man7/socket.7
> index 96f6f173a40b..ebe0264d7ae4 100644
> --- a/man/man7/socket.7
> +++ b/man/man7/socket.7
> @@ -662,14 +662,24 @@ For more information, see
>  .TP
>  .BR SO_PEEK_OFF " (since Linux 3.4)"
>  .\" commit ef64a54f6e558155b4f149bb10666b9e914b6c54
> -This option, which is currently supported only for
> -.BR unix (7)
> -sockets, sets the value of the "peek offset" for the
> +This option sets the value of the "peek offset" for the
>  .BR recv (2)
>  system call when used with
>  .B MSG_PEEK
>  flag.
>  .IP
> +This option is supported for
> +.\" commit f55bb7f9cb82dec2f2e803d7bd0fc5929248e4d8
> +.BR unix (7)
> +sockets since Linux 3.4,
> +.\" commit 627d2d6b550094d88f9e518e15967e7bf906ebbf
> +for UDP sockets since Linux 4.7,
> +and for TCP sockets since
> +.\" commit 05ea491641d338422edbd87af3b311c16ea762f5
> +Linux 6.10 (IPv4) and
> +.\" commit be9a4fb831b8b6dc5724dd3e61973ea91b413ec1
> +Linux 6.12 (IPv6).
> +.IP
>  When this option is set to a negative value
>  (it is set to \-1 for all new sockets),
>  traditional behavior is provided:
> -- 
> 2.56.0
> 
> 

-- 
<https://www.alejandro-colomar.es>