Re: [PATCH v2] man/man7/tcp.7: Document effect of TCP_DEFER_ACCEPT on client socket
From: Alejandro Colomar <alx@kernel.org>
Date: 2026-03-16 00:10:03
Hi Ran, On 2026-03-13T11:26:12+0200, Ran Benita wrote:
TCP_DEFER_ACCEPT has an interesting little-known effect on client sockets. I don't think it's very useful but should still be documented. See here for reference: <https://elixir.bootlin.com/linux/v6.19.6/source/net/ipv4/tcp_input.c#L6781-L6796> Signed-off-by: Ran Benita <redacted>
Thanks! I've applied the patch. Have a lovely night! Alex
quoted hunk ↗ jump to hunk
--- Thanks for taking a look. I fixed the following: - Change non-zero -> nonzero - Use semantic newlines man/man7/tcp.7 | 6 ++++++ 1 file changed, 6 insertions(+)diff --git a/man/man7/tcp.7 b/man/man7/tcp.7 index adfd6623e..80b91ffda 100644 --- a/man/man7/tcp.7 +++ b/man/man7/tcp.7@@ -1091,6 +1091,12 @@ Allow a listener to be awakened only when data arrives on the socket. Takes an integer value (seconds), this can bound the maximum number of attempts TCP will make to complete the connection. +.IP +On a client socket, if nonzero, +delays sending the final ACK of the three-way handshake until the socket has data to send, +in which case the ACK is piggybacked on the first data segment, +or a delayed-ACK timeout is reached. +.IP This option should not be used in code intended to be portable. .TP .BR TCP_INFO " (since Linux 2.4)"-- 2.53.0
-- <https://www.alejandro-colomar.es>
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