Hello Michael:

It is the latter, better documentation of longstanding behavior.

There is a bug, however, that broke the functionality two years ago.
The bug is being fixed.

Thanks.  -- Enke

On Thu, Jan 14, 2021 at 01:08:26PM +0100, Michael Kerrisk (man-pages) wrote:

Hello Enke (and Eric),

Thank you for the patch. Is this a change in behavior, or a better
documentation of longstanding behavior?

Eric, do you have an Ack/Review for this patch?

Thanks,

Michael

On Sat, 9 Jan 2021 at 06:21, Enke Chen [off-list ref] wrote:

quoted

diff --git a/man7/tcp.7 b/man7/tcp.7
index 6c91f058b..2ce831c90 100644
--- a/man7/tcp.7
+++ b/man7/tcp.7

@@ -1161,7 +1161,8 @@ This option takes an
 as an argument.
 When the value is greater than 0,
 it specifies the maximum amount of time in milliseconds that transmitted
-data may remain unacknowledged before TCP will forcibly close the
+data may remain unacknowledged, or bufferred data may remain untransmitted
+(due to zero window size) before TCP will forcibly close the
 corresponding connection and return
 .B ETIMEDOUT
 to the application.

-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/