From 06130c5e61160b20305c9e6a621fa1c4d0df7858 Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Mon, 5 Jan 2026 20:31:31 -0800
Subject: [PATCH] std.Io.Threaded: set O_DIRECTORY along with O_TMPFILE

---
 lib/std/Io/Threaded.zig | 2 ++
 lib/std/c.zig           | 2 ++
 lib/std/os/linux.zig    | 8 ++++++++
 3 files changed, 12 insertions(+)

diff --git a/lib/std/Io/Threaded.zig b/lib/std/Io/Threaded.zig
index 613001224f0a09f13ad872c1902b0d197f92fb09..ed409149509984486c5545879d092ab637a9dc72 100644
--- a/lib/std/Io/Threaded.zig
+++ b/lib/std/Io/Threaded.zig
@@ -3433,11 +3433,13 @@ fn dirCreateFileAtomic(
         const flags: posix.O = if (@hasField(posix.O, "TMPFILE")) .{
             .ACCMODE = .RDWR,
             .TMPFILE = true,
+            .DIRECTORY = true,
             .CLOEXEC = true,
         } else if (@hasField(posix.O, "TMPFILE0") and !@hasField(posix.O, "TMPFILE2")) .{
             .ACCMODE = .RDWR,
             .TMPFILE0 = true,
             .TMPFILE1 = true,
+            .DIRECTORY = true,
             .CLOEXEC = true,
         } else break :tmpfile;
 
diff --git a/lib/std/c.zig b/lib/std/c.zig
index 0e620082b40ba0532d4dfe3862ea84254f7c7237..3eea82d3da7edc361681b1608cd1876ac5e0e671 100644
--- a/lib/std/c.zig
+++ b/lib/std/c.zig
@@ -8427,6 +8427,7 @@ pub const O = switch (native_os) {
         CLOEXEC: bool = false,
         SYNC: bool = false,
         PATH: bool = false,
+        /// This is typically invalid without also setting `DIRECTORY`.
         TMPFILE: bool = false,
         _: u9 = 0,
     },
@@ -8615,6 +8616,7 @@ pub const O = switch (native_os) {
         _19: u1 = 0,
         CLOEXEC: bool = false,
         PATH: bool = false,
+        /// This is typically invalid without also setting `DIRECTORY`.
         TMPFILE: bool = false,
         _: u9 = 0,
     },
diff --git a/lib/std/os/linux.zig b/lib/std/os/linux.zig
index 023674e71043c1846ca6f7b083d65fd7c53a027f..812e07f7e821d5bd3fa34032b0e9088d74465ef4 100644
--- a/lib/std/os/linux.zig
+++ b/lib/std/os/linux.zig
@@ -324,6 +324,7 @@ pub const O = switch (native_arch) {
         CLOEXEC: bool = false,
         SYNC: bool = false,
         PATH: bool = false,
+        /// This is typically invalid without also setting `DIRECTORY`.
         TMPFILE: bool = false,
         _23: u9 = 0,
     },
@@ -346,6 +347,7 @@ pub const O = switch (native_arch) {
         CLOEXEC: bool = false,
         SYNC: bool = false,
         PATH: bool = false,
+        /// This is typically invalid without also setting `DIRECTORY`.
         TMPFILE: bool = false,
         _23: u9 = 0,
     },
@@ -368,6 +370,7 @@ pub const O = switch (native_arch) {
         CLOEXEC: bool = false,
         SYNC: bool = false,
         PATH: bool = false,
+        /// This is typically invalid without also setting `DIRECTORY`.
         TMPFILE: bool = false,
         _23: u9 = 0,
     },
@@ -393,6 +396,7 @@ pub const O = switch (native_arch) {
         CLOEXEC: bool = false,
         SYNC: bool = false,
         PATH: bool = false,
+        /// This is typically invalid without also setting `DIRECTORY`.
         TMPFILE: bool = false,
         _27: u6 = 0,
     },
@@ -417,6 +421,7 @@ pub const O = switch (native_arch) {
         CLOEXEC: bool = false,
         _20: u1 = 0,
         PATH: bool = false,
+        /// This is typically invalid without also setting `DIRECTORY`.
         TMPFILE: bool = false,
         _23: u9 = 0,
     },
@@ -439,6 +444,7 @@ pub const O = switch (native_arch) {
         CLOEXEC: bool = false,
         SYNC: bool = false,
         PATH: bool = false,
+        /// This is typically invalid without also setting `DIRECTORY`.
         TMPFILE: bool = false,
         _23: u9 = 0,
     },
@@ -459,9 +465,11 @@ pub const O = switch (native_arch) {
         NOFOLLOW: bool = false,
         NOATIME: bool = false,
         CLOEXEC: bool = false,
+        /// This is typically invalid without also setting `TMPFILE1` and `DIRECTORY`.
         TMPFILE0: bool = false,
         PATH: bool = false,
         _22: u4 = 0,
+        /// This is typically invalid without also setting `TMPFILE0` and `DIRECTORY`.
         TMPFILE1: bool = false,
         _27: u5 = 0,
 
-- 
2.54.0