From 0e45b9d5db6cd92578d1a1da13ff2c036603ff91 Mon Sep 17 00:00:00 2001
From: Brandon Black <bblack@wikimedia.org>
Date: Tue, 9 Sep 2025 16:46:33 -0500
Subject: [PATCH] std: add linger struct for SO.LINGER

---
 lib/std/c.zig        | 31 +++++++++++++++++++++++++++++++
 lib/std/os/linux.zig |  6 ++++++
 lib/std/posix.zig    |  1 +
 3 files changed, 38 insertions(+)

diff --git a/lib/std/c.zig b/lib/std/c.zig
index 21d7ed1f2c..6576ba1c46 100644
--- a/lib/std/c.zig
+++ b/lib/std/c.zig
@@ -4124,6 +4124,37 @@ pub const itimerspec = switch (native_os) {
     },
     else => void,
 };
+pub const linger = switch (native_os) {
+    .linux => linux.linger,
+    // https://github.com/freebsd/freebsd-src/blob/46347b3619757e3d683a87ca03efaf2ae242335f/sys/sys/socket.h#L200
+    .freebsd,
+    // https://github.com/DragonFlyBSD/DragonFlyBSD/blob/6098912863ed4c7b3f70d7483910ce2956cf4ed3/sys/sys/socket.h#L158
+    .dragonfly,
+    // https://github.com/NetBSD/src/blob/80bf25a5691072d4755e84567ccbdf0729370dea/sys/sys/socket.h#L183
+    .netbsd,
+    // https://github.com/openbsd/src/blob/718a31b40d39fc6064de6355eb144e74633133fc/sys/sys/socket.h#L126
+    .openbsd,
+    // https://github.com/kofemann/opensolaris/blob/80192cd83bf665e708269dae856f9145f7190f74/usr/src/uts/common/sys/socket.h#L214
+    .solaris,
+    // https://github.com/illumos/illumos-gate/blob/608eb926e14f4ba4736b2d59e891335f1cba9e1e/usr/src/uts/common/sys/socket.h#L250
+    .illumos,
+    // https://github.com/haiku/haiku/blob/2aab5f5f14aeb3f34c3a3d9a9064cc3c0d914bea/headers/posix/sys/socket.h#L87
+    .haiku,
+    // https://github.com/SerenityOS/serenity/blob/5bd8af99be0bc4b2e14f361fd7d7590e6bcfa4d6/Kernel/API/POSIX/sys/socket.h#L122
+    .serenity,
+    // https://github.com/apple/darwin-xnu/blob/2ff845c2e033bd0ff64b5b6aa6063a1f8f65aa32/bsd/sys/socket.h#L498
+    .driverkit,
+    .ios,
+    .macos,
+    .tvos,
+    .watchos,
+    .visionos,
+    => extern struct {
+        onoff: i32, // non-zero to linger on close
+        linger: i32, // time to linger in seconds
+    },
+    else => void,
+};
 pub const msghdr = switch (native_os) {
     .linux => linux.msghdr,
     .openbsd,
diff --git a/lib/std/os/linux.zig b/lib/std/os/linux.zig
index fa870e8f67..e6fcd08f19 100644
--- a/lib/std/os/linux.zig
+++ b/lib/std/os/linux.zig
@@ -4524,6 +4524,12 @@ pub const IPV6 = struct {
     pub const FREEBIND = 78;
 };
 
+// https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/linux/socket.h?id=b1e904999542ad6764eafa54545f1c55776006d1#n43
+pub const linger = extern struct {
+    onoff: i32, // non-zero to linger on close
+    linger: i32, // time to linger in seconds
+};
+
 // https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/uapi/linux/in.h?id=64e844505bc08cde3f346f193cbbbab0096fef54#n250
 pub const in_pktinfo = extern struct {
     ifindex: i32,
diff --git a/lib/std/posix.zig b/lib/std/posix.zig
index 67888de1bb..283bc9276c 100644
--- a/lib/std/posix.zig
+++ b/lib/std/posix.zig
@@ -137,6 +137,7 @@ pub const ifreq = system.ifreq;
 pub const in_pktinfo = system.in_pktinfo;
 pub const in6_pktinfo = system.in6_pktinfo;
 pub const ino_t = system.ino_t;
+pub const linger = system.linger;
 pub const mcontext_t = system.mcontext_t;
 pub const mode_t = system.mode_t;
 pub const msghdr = system.msghdr;