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authorMario Schuknecht <m.schuknecht@dresearch.de>2011-03-09 17:08:09 -0500
committerDavid S. Miller <davem@davemloft.net>2011-03-09 17:08:09 -0500
commit2f4e1b3970973bbb57cc3a3b9d67e67c1c648c37 (patch)
treed7b4d7d64ed8a02c3cd10064eb9d8e177d2be5c3 /net/ipv4/tcp.c
parentee3f1aaf930b7cfbf3d34eff1e5e076393227e90 (diff)
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.c9
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)
505 else 505 else
506 answ = tp->write_seq - tp->snd_una; 506 answ = tp->write_seq - tp->snd_una;
507 break; 507 break;
508 case SIOCOUTQNSD:
509 if (sk->sk_state == TCP_LISTEN)
510 return -EINVAL;
511
512 if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV))
513 answ = 0;
514 else
515 answ = tp->write_seq - tp->snd_nxt;
516 break;
508 default: 517 default:
509 return -ENOIOCTLCMD; 518 return -ENOIOCTLCMD;
510 } 519 }