linux-kernel - Re: [PATCH] AF_UNIX: Implement SO_TIMESTAMP and SO

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Message-ID: <1286215789.2381.2.camel@edumazet-laptop>
Date:	Mon, 04 Oct 2010 20:09:49 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alban Crequy <alban.crequy@...labora.co.uk>
Cc:	Lennart Poettering <lennart@...ttering.net>,
	"David S. Miller" <davem@...emloft.net>,
	Stephen Hemminger <shemminger@...tta.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] AF_UNIX: Implement SO_TIMESTAMP and SO_TIMETAMPNS on
 Unix sockets

Le lundi 04 octobre 2010 à 19:01 +0100, Alban Crequy a écrit :
> Userspace applications can already request to receive timestamps with:
> setsockopt(sockfd, SOL_SOCKET, SO_TIMESTAMP, ...)
> 
> Although setsockopt() returns zero (success), timestamps are not added to the
> ancillary data. This patch fixes that on SOCK_DGRAM and SOCK_SEQPACKET Unix
> sockets.
> 
> Signed-off-by: Alban Crequy <alban.crequy@...labora.co.uk>
> ---
>  net/unix/af_unix.c |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
> 
> diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
> index 617bea4..bca0c1e 100644
> --- a/net/unix/af_unix.c
> +++ b/net/unix/af_unix.c
> @@ -1697,6 +1697,9 @@ static int unix_dgram_recvmsg(struct kiocb *iocb, struct socket *sock,
>  	if (err)
>  		goto out_free;
>  
> +	if (sock_flag(sk, SOCK_RCVTSTAMP))
> +		__sock_recv_timestamp(msg, sk, skb);
> +
>  	if (!siocb->scm) {
>  		siocb->scm = &tmp_scm;
>  		memset(&tmp_scm, 0, sizeof(tmp_scm));

Hmm, but how is set skb->tstamp ?

I think its zero at this point, so __sock_recv_timestamp() use current
time, not time of send().

gettimeofday() might be better/cheaper :)



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