From 1f4830f21af0baf9c41061eaff66d9f690a96edc Mon Sep 17 00:00:00 2001
From: David Carlier <devnexen@gmail.com>
Date: Sun, 15 May 2022 17:43:20 +0100
Subject: [PATCH] Add TCP_NOTSENT_LOWAT socket option

Can be used to limit the amount of unsent data per socket.

Closes GH-8559.
---
 NEWS                  | 3 +++
 UPGRADING             | 1 +
 ext/sockets/sockets.c | 3 +++
 3 files changed, 7 insertions(+)

diff --git a/NEWS b/NEWS
index b8c7d918453..c20c9196400 100644
--- a/NEWS
+++ b/NEWS
@@ -49,6 +49,9 @@ PHP                                                                        NEWS
   . Fixed bug GH-7787 (Improve session write failure message for user error
     handlers). (ilutov)
 
+- Sockets:
+  . Added TCP_NOTSENT_LOWAT socket option. (David Carlier)
+
 - Sodium:
   . Added sodium_crypto_stream_xchacha20_xor_ic(). (Scott)
 
diff --git a/UPGRADING b/UPGRADING
index a332b48346e..e54ace41d80 100644
--- a/UPGRADING
+++ b/UPGRADING
@@ -203,6 +203,7 @@ PHP 8.2 UPGRADE NOTES
 
 - Sockets:
   . SO_INCOMING_CPU
+  . TCP_NOTSENT_LOWAT
 
 ========================================
 11. Changes to INI File Handling
diff --git a/ext/sockets/sockets.c b/ext/sockets/sockets.c
index 8398e004d0b..ea3d8211845 100644
--- a/ext/sockets/sockets.c
+++ b/ext/sockets/sockets.c
@@ -553,6 +553,9 @@ static PHP_MINIT_FUNCTION(sockets)
 #ifdef TCP_NODELAY
 	REGISTER_LONG_CONSTANT("TCP_NODELAY",   TCP_NODELAY,    CONST_CS | CONST_PERSISTENT);
 #endif
+#ifdef TCP_NOTSENT_LOWAT
+	REGISTER_LONG_CONSTANT("TCP_NOTSENT_LOWAT",  TCP_NOTSENT_LOWAT,   CONST_CS | CONST_PERSISTENT);
+#endif
 #ifdef TCP_DEFER_ACCEPT
 	REGISTER_LONG_CONSTANT("TCP_DEFER_ACCEPT",   TCP_DEFER_ACCEPT,    CONST_CS | CONST_PERSISTENT);
 #endif