[DCCP]: Update documentation on ioctls

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/Documentation/networking/dccp.txt b/Documentation/networking/dccp.txt
index ffb9ca937d65..d76905a5a087 100644
--- a/Documentation/networking/dccp.txt
+++ b/Documentation/networking/dccp.txt
@@ -136,6 +136,12 @@ sync_ratelimit = 125 ms
         sequence-invalid packets on the same socket (RFC 4340, 7.5.4). The unit
         of this parameter is milliseconds; a value of 0 disables rate-limiting.
 
+IOCTLS
+======
+FIONREAD
+        Works as in udp(7): returns in the `int' argument pointer the size of
+        the next pending datagram in bytes, or 0 when no datagram is pending.
+
 Notes
 =====