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| author | Mario Schuknecht <m.schuknecht@dresearch.de> | 2011-03-09 14:08:09 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-03-09 14:08:09 -0800 |
| commit | 2f4e1b3970973bbb57cc3a3b9d67e67c1c648c37 (patch) | |
| tree | d7b4d7d64ed8a02c3cd10064eb9d8e177d2be5c3 /net/ipv4/tcp.c | |
| parent | ee3f1aaf930b7cfbf3d34eff1e5e076393227e90 (diff) | |
| download | kernel_samsung_espresso10-2f4e1b3970973bbb57cc3a3b9d67e67c1c648c37.tar.gz kernel_samsung_espresso10-2f4e1b3970973bbb57cc3a3b9d67e67c1c648c37.tar.bz2 kernel_samsung_espresso10-2f4e1b3970973bbb57cc3a3b9d67e67c1c648c37.zip | |
tcp: ioctl type SIOCOUTQNSD returns amount of data not sent
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@dresearch.de>
Signed-off-by: Steffen Sledz <sledz@dresearch.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp.c')
| -rw-r--r-- | net/ipv4/tcp.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index a17a5a72b98..b22d4501054 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; } |