Am 05.10.2010 11:32, schrieb Mario Schuknecht:
> In contrast to SIOCOUTQ which returns the amount of data sent
> but not yet acknowledged plus data not yet sent this patch only
> returns the data not sent.
>
> For various methods of live streaming bitrate control it may
> be helpful to know how much data are in the tcp outqueue are
> not sent yet.
>
> Signed-off-by: Mario Schuknecht <m.schuknecht@xxxxxxxxxxxx>
> ---
> include/asm-generic/ioctls.h | 1 +
> include/linux/sockios.h | 1 +
> net/ipv4/tcp.c | 9 +++++++++
> 3 files changed, 11 insertions(+), 0 deletions(-)
>
> diff --git a/include/asm-generic/ioctls.h b/include/asm-generic/ioctls.h
> index a321665..b87115b 100644
> --- a/include/asm-generic/ioctls.h
> +++ b/include/asm-generic/ioctls.h
> @@ -72,6 +72,7 @@
> #define TCSETXF 0x5434
> #define TCSETXW 0x5435
> #define TIOCSIG _IOW('T', 0x36, int) /* pty: generate signal */
> +#define TIOCOUTQNSD 0x5437
>
> #define FIONCLEX 0x5450
> #define FIOCLEX 0x5451
> diff --git a/include/linux/sockios.h b/include/linux/sockios.h
> index 241f179..4c5ca47 100644
> --- a/include/linux/sockios.h
> +++ b/include/linux/sockios.h
> @@ -23,6 +23,7 @@
> /* Linux-specific socket ioctls */
> #define SIOCINQ FIONREAD
> #define SIOCOUTQ TIOCOUTQ
> +#define SIOCOUTQNSD TIOCOUTQNSD
>
> /* Routing table calls. */
> #define SIOCADDRT 0x890B /* add routing table entry */
> diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
> index 1664a05..c2d52e8 100644
> --- a/net/ipv4/tcp.c
> +++ b/net/ipv4/tcp.c
> @@ -505,6 +505,15 @@ int tcp_ioctl(struct sock *sk, int cmd, unsigned long arg)
> else
> answ = tp->write_seq - tp->snd_una;
> break;
> + case SIOCOUTQNSD:
> + if (sk->sk_state == TCP_LISTEN)
> + return -EINVAL;
> +
> + if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV))
> + answ = 0;
> + else
> + answ = tp->write_seq - tp->snd_nxt;
> + break;
> default:
> return -ENOIOCTLCMD;
> }
Ping!
It would be nice to get some feedback on this. We really need an extension of this kind.
If the patch does something in a wrong way (esp. choosing the TIOCOUTQNSD id) please give us a hint how to do it in the right way.
Thx,
Steffen Sledz
--
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Otto-Schmirgal-Str. 3, 10319 Berlin, Germany
Tel: +49 30 515932-237 mailto:sledz@xxxxxxxxxxxx
Fax: +49 30 515932-299
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Ust.-IDNr. DE273952058
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