Signed-off-by: Kornilios Kourtis <[email protected]>
---
Documentation/networking/msg_zerocopy.rst | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/Documentation/networking/msg_zerocopy.rst
b/Documentation/networking/msg_zerocopy.rst
index 77f6d7e..c3380f4 100644
--- a/Documentation/networking/msg_zerocopy.rst
+++ b/Documentation/networking/msg_zerocopy.rst
@@ -72,6 +72,10 @@ this flag, a process must first signal intent by setting a
socket option:
if (setsockopt(fd, SOL_SOCKET, SO_ZEROCOPY, &one, sizeof(one)))
error(1, errno, "setsockopt zerocopy");
+Setting the socket option only works when the socket is in its initial
+(TCP_CLOSED) state. Trying to set the option for a socket returned by
accept(),
+for example, will lead to an EBUSY error. In this case, the option should be
set
+to the listening socket and it will be inherited by the accepted sockets.
Transmission
------------
--
2.4.3
