doc: document new TCP_KEEPCNT and TCP_KEEPINTVL socket option defaults

PR #32204 introduced new defaults for the TCP keep-alive socket options (see deps/uv/src/unix/tcp.c): - "TCP_KEEPCNT" now defaults to 10 on all platforms - "TCP_KEEPINTVL" now defaults to 1 on all platforms Previously, "TCP_KEEPCNT" and "TCP_KEEPINTVL" were not set explicitly and OS-default values were used. Fixes: #38298 Refs: #32204 PR-URL: #38313 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Rich Trott <[email protected]>
nodejs · May 30, 2021 · 07528a3 · 07528a3
1 parent 5229247
commit 07528a3
Showing 1 changed file with 12 additions and 0 deletions.
diff --git a/doc/api/net.md b/doc/api/net.md
@@ -873,6 +873,12 @@ Set the encoding for the socket as a [Readable Stream][]. See
 ### `socket.setKeepAlive([enable][, initialDelay])`
 <!-- YAML
 added: v0.1.92
+changes:
+  - version:
+    - v13.12.0
+    - v12.17.0
+    pr-url: https://github.com/nodejs/node/pull/32204
+    description: New defaults for `TCP_KEEPCNT` and `TCP_KEEPINTVL` socket options were added.
 -->
 
 * `enable` {boolean} **Default:** `false`
@@ -887,6 +893,12 @@ data packet received and the first keepalive probe. Setting `0` for
 `initialDelay` will leave the value unchanged from the default
 (or previous) setting.
 
+Enabling the keep-alive functionality will set the following socket options:
+* `SO_KEEPALIVE=1`
+* `TCP_KEEPIDLE=initialDelay`
+* `TCP_KEEPCNT=10`
+* `TCP_KEEPINTVL=1`
+
 ### `socket.setNoDelay([noDelay])`
 <!-- YAML
 added: v0.1.90