From e1c0f13ae54ced1505abb1934e3ae7e0f8d118a2 Mon Sep 17 00:00:00 2001
From: Brandon Black <bblack@wikimedia.org>
Date: Thu, 3 Sep 2026 10:37:53 -0500
Subject: [PATCH] std.c: define TCP options for several OSes

Primary motivation was the lack of TCP.NODELAY on multiple targets
that should have it.

Note that FreeBSD has a much larger set of defines in the "TCP_"
namespace than what I've pasted here, including a bunch of
non-option constants and extremely platform-specific features. I
stuck to just the simpler and more traditional options only for
now. The rest could be added later, and may need some thought as
how to best represent them.
---
 lib/std/c.zig           |  6 ++++++
 lib/std/c/dragonfly.zig | 14 ++++++++++++++
 lib/std/c/freebsd.zig   | 43 +++++++++++++++++++++++++++++++++++++++++
 lib/std/c/haiku.zig     |  8 ++++++++
 lib/std/c/illumos.zig   | 28 +++++++++++++++++++++++++++
 lib/std/c/netbsd.zig    | 13 +++++++++++++
 lib/std/c/openbsd.zig   | 10 ++++++++++
 7 files changed, 122 insertions(+)

diff --git a/lib/std/c.zig b/lib/std/c.zig
index 5fcefbf03ed0f0b3e86b7ee228f901fcd0b38e2f..e3625edb869186614eb961174748f5fcab77f5b4 100644
--- a/lib/std/c.zig
+++ b/lib/std/c.zig
@@ -5997,8 +5997,14 @@ pub const SOCK = switch (native_os) {
 pub const TCP = switch (native_os) {
     .driverkit, .ios, .maccatalyst, .macos, .tvos, .visionos, .watchos => darwin.TCP,
     .linux => linux.TCP,
+    .freebsd => freebsd.TCP,
+    .netbsd => netbsd.TCP,
+    .openbsd => openbsd.TCP,
+    .dragonfly => dragonfly.TCP,
     .emscripten => emscripten.TCP,
     .windows => ws2_32.TCP,
+    .illumos => illumos.TCP,
+    .haiku => haiku.TCP,
     // https://github.com/SerenityOS/serenity/blob/61ac554a3403838f79ca746bd1c65ded6f97d124/Kernel/API/POSIX/netinet/tcp.h#L13-L14
     .serenity => struct {
         pub const NODELAY = 10;
diff --git a/lib/std/c/dragonfly.zig b/lib/std/c/dragonfly.zig
index 40fb9c8b836bdda8f2bbccaac8c6c2dbd5285d92..75ace2565a5439267930563e8b647df025091c28 100644
--- a/lib/std/c/dragonfly.zig
+++ b/lib/std/c/dragonfly.zig
@@ -302,3 +302,17 @@ pub const IPTOS = struct {
     pub const ECN_CE = 0x03;
     pub const ECN_MASK = 0x03;
 };
+
+// https://github.com/DragonFlyBSD/DragonFlyBSD/blob/8410ea0817ce17438e0a10fc4ba6c9697281048a/sys/netinet/tcp.h#L156
+pub const TCP = struct {
+    pub const NODELAY = 0x01;
+    pub const MAXSEG = 0x02;
+    pub const NOPUSH = 0x04;
+    pub const NOOPT = 0x08;
+    pub const SIGNATURE_ENABLE = 0x10;
+    pub const KEEPINIT = 0x20;
+    pub const FASTKEEP = 0x80;
+    pub const KEEPIDLE = 0x100;
+    pub const KEEPINTVL = 0x200;
+    pub const KEEPCNT = 0x400;
+};
diff --git a/lib/std/c/freebsd.zig b/lib/std/c/freebsd.zig
index ad67b23a14685bd6fc7fd4ffefa25c3edb7f41e9..adea1bdadfddd08bdfe9cac4b077c7b4c12a5761 100644
--- a/lib/std/c/freebsd.zig
+++ b/lib/std/c/freebsd.zig
@@ -586,3 +586,46 @@ pub const IPTOS = struct {
     pub const ECN_CE = 0x03;
     pub const ECN_MASK = 0x03;
 };
+
+// https://cgit.freebsd.org/src/tree/sys/netinet/tcp.h?id=52c0d52b91e34f9190c9ba8fab7b6bc463bc4cbb#n183
+pub const TCP = struct {
+    pub const NODELAY = 1;
+    pub const MAXSEG = 2;
+    pub const NOPUSH = 4;
+    pub const NOOPT = 8;
+    pub const MD5SIG = 16;
+    pub const INFO = 32;
+    pub const STATS = 33;
+    pub const LOG = 34;
+    pub const LOGBUF = 35;
+    pub const LOGID = 36;
+    pub const LOGDUMP = 37;
+    pub const LOGDUMPID = 38;
+    pub const TXTLS_ENABLE = 39;
+    pub const TXTLS_MODE = 40;
+    pub const RXTLS_ENABLE = 41;
+    pub const RXTLS_MODE = 42;
+    pub const IWND_NB = 43;
+    pub const IWND_NSEG = 44;
+    pub const USE_DDP = 45;
+    pub const LOGID_CNT = 46;
+    pub const LOG_TAG = 47;
+    pub const USER_LOG = 48;
+    pub const CONGESTION = 64;
+    pub const CCALGOOPT = 65;
+    pub const MAXUNACKTIME = 68;
+    pub const IDLE_REDUCE = 70;
+    pub const REMOTE_UDP_ENCAPS_PORT = 71;
+    pub const DELACK = 72;
+    pub const FIN_IS_RST = 73;
+    pub const LOG_LIMIT = 74;
+    pub const SHARED_CWND_ALLOWED = 75;
+    pub const PROC_ACCOUNTING = 76;
+    pub const USE_CMP_ACKS = 77;
+    pub const PERF_INFO = 78;
+    pub const KEEPINIT = 128;
+    pub const KEEPIDLE = 256;
+    pub const KEEPINTVL = 512;
+    pub const KEEPCNT = 1024;
+    pub const FASTOPEN = 1025;
+};
diff --git a/lib/std/c/haiku.zig b/lib/std/c/haiku.zig
index dd8bb8abf621324ba3ff2c9765f17524e30624c6..9e59fbb8b55e6c5ac9d0214a6e9f04bba2aac698 100644
--- a/lib/std/c/haiku.zig
+++ b/lib/std/c/haiku.zig
@@ -289,3 +289,11 @@ pub const IPTOS = struct {
     pub const THROUGHPUT = 0x08;
     pub const LOWDELAY = 0x10;
 };
+
+// https://github.com/haiku/haiku/blob/2ffb9aef511dde272ab57d545a5d8631705a5ec8/headers/posix/netinet/tcp.h#L74
+pub const TCP = struct {
+    pub const NODELAY = 0x01;
+    pub const MAXSEG = 0x02;
+    pub const NOPUSH = 0x04;
+    pub const NOOPT = 0x08;
+};
diff --git a/lib/std/c/illumos.zig b/lib/std/c/illumos.zig
index 634c0c124e33c6fb655049083d14ef459a95d350..86e3be7f3dad324c1e84749084a170ce2cc91199 100644
--- a/lib/std/c/illumos.zig
+++ b/lib/std/c/illumos.zig
@@ -455,3 +455,31 @@ pub const IPTOS = struct {
     pub const PREC_PRIORITY = 0x20;
     pub const PREC_ROUTINE = 0x00;
 };
+
+// https://github.com/illumos/illumos-gate/blob/e1e6b944360d951edf36ef4198261818ed2d9b2f/usr/src/uts/common/netinet/tcp.h#L94
+pub const TCP = struct {
+    pub const NODELAY = 0x01;
+    pub const MAXSEG = 0x02;
+    pub const KEEPALIVE = 0x8;
+    pub const NOTIFY_THRESHOLD = 0x10;
+    pub const ABORT_THRESHOLD = 0x11;
+    pub const CONN_NOTIFY_THRESHOLD = 0x12;
+    pub const CONN_ABORT_THRESHOLD = 0x13;
+    pub const RECVDSTADDR = 0x14;
+    pub const INIT_CWND = 0x15;
+    pub const KEEPALIVE_THRESHOLD = 0x16;
+    pub const KEEPALIVE_ABORT_THRESHOLD = 0x17;
+    pub const CORK = 0x18;
+    pub const RTO_INITIAL = 0x19;
+    pub const RTO_MIN = 0x1A;
+    pub const RTO_MAX = 0x1B;
+    pub const LINGER2 = 0x1C;
+    pub const ANONPRIVBIND = 0x20;
+    pub const EXCLBIND = 0x21;
+    pub const KEEPIDLE = 0x22;
+    pub const KEEPCNT = 0x23;
+    pub const KEEPINTVL = 0x24;
+    pub const CONGESTION = 0x25;
+    pub const QUICKACK = 0x26;
+    pub const MD5SIG = 0x27;
+};
diff --git a/lib/std/c/netbsd.zig b/lib/std/c/netbsd.zig
index f15cf498b15d672a6943fea04c88c4d415120d07..5ebb3a57c17a549f7ac179262cf0c1cd4767c646 100644
--- a/lib/std/c/netbsd.zig
+++ b/lib/std/c/netbsd.zig
@@ -373,3 +373,16 @@ pub const IPTOS = struct {
     pub const PREC_PRIORITY = 0x20;
     pub const PREC_ROUTINE = 0x00;
 };
+
+// https://github.com/NetBSD/src/blob/2579a44b3da9597de159e42cb1b5db0d382bd511/sys/netinet/tcp.h#L126
+pub const TCP = struct {
+    pub const NODELAY = 1;
+    pub const MAXSEG = 2;
+    pub const KEEPIDLE = 3;
+    pub const KEEPINTVL = 5;
+    pub const KEEPCNT = 6;
+    pub const KEEPINIT = 7;
+    pub const INFO = 9;
+    pub const MD5SIG = 0x10;
+    pub const CONGCTL = 0x20;
+};
diff --git a/lib/std/c/openbsd.zig b/lib/std/c/openbsd.zig
index 1dd65dca7b2f7ceb1c0ccbf02c4f5ae1bb073f2a..91ba8a8f5f76b85a2952c0a37421dcc11925a087 100644
--- a/lib/std/c/openbsd.zig
+++ b/lib/std/c/openbsd.zig
@@ -443,3 +443,13 @@ pub const IPTOS = struct {
     pub const ECN_CE = 0x03;
     pub const ECN_MASK = 0x03;
 };
+
+// https://github.com/openbsd/src/blob/5761484065d1eed341f812f818ecf3f79138e7c6/sys/netinet/tcp.h#L215
+pub const TCP = struct {
+    pub const NODELAY = 0x01;
+    pub const MAXSEG = 0x02;
+    pub const MD5SIG = 0x04;
+    pub const SACK_ENABLE = 0x08;
+    pub const INFO = 0x09;
+    pub const NOPUSH = 0x10;
+};
-- 
2.54.0