From 09f06082f0b43f93d1d4267539cb29c603fe0d11 Mon Sep 17 00:00:00 2001
From: Michael Dusan <michael.dusan@gmail.com>
Date: Mon, 29 Dec 2025 21:02:12 -0500
Subject: [PATCH] openbsd: make test lib/std/std.zig pass

* According to OpenBSD's getdents docs indicate the buffer must be
  greater or or equal to the block size associated with the file and to
  refer to stat(2).
* Use S_BLKSIZE, which is 512, instead of @sizeOf(std.c.dirent), which is 280.
* Oddly the other BSDs are not this picky.
---
 lib/std/Io/Dir.zig  | 1 +
 lib/std/c.zig       | 2 ++
 lib/std/fs/test.zig | 1 +
 3 files changed, 4 insertions(+)

diff --git a/lib/std/Io/Dir.zig b/lib/std/Io/Dir.zig
index 6db13f5c6cd1daeb770436519f5168daeb23eb8a..82bf3b927df0cd22a14f640e1b1f58aedc23c373 100644
--- a/lib/std/Io/Dir.zig
+++ b/lib/std/Io/Dir.zig
@@ -113,6 +113,7 @@ pub const Reader = struct {
         },
         .wasi => @sizeOf(std.os.wasi.dirent_t) +
             std.mem.alignForward(usize, max_name_bytes, @alignOf(std.os.wasi.dirent_t)),
+        .openbsd => std.c.S.BLKSIZE,
         else => if (builtin.link_libc) @sizeOf(std.c.dirent) else std.mem.alignForward(usize, max_name_bytes, @alignOf(usize)),
     };
 
diff --git a/lib/std/c.zig b/lib/std/c.zig
index 53d30d80283eff673eb0f2de137e8c5e16ef604f..2fb62a3443433cb16f7d998af7a0b434fbd5a761 100644
--- a/lib/std/c.zig
+++ b/lib/std/c.zig
@@ -2377,6 +2377,8 @@ pub const S = switch (native_os) {
         pub const IWOTH = 0o002;
         pub const IXOTH = 0o001;
 
+        pub const BLKSIZE = 512;
+
         pub fn ISFIFO(m: u32) bool {
             return m & IFMT == IFIFO;
         }
diff --git a/lib/std/fs/test.zig b/lib/std/fs/test.zig
index bcb9048e0e05428a7288c25d292d37251b000dee..608bc73e62408ce4b929e6c47d155c2309ad9dae 100644
--- a/lib/std/fs/test.zig
+++ b/lib/std/fs/test.zig
@@ -645,6 +645,7 @@ fn contains(entries: *const std.array_list.Managed(Dir.Entry), el: Dir.Entry) bo
 
 test "Dir.realPath smoke test" {
     if (native_os == .wasi) return error.SkipZigTest;
+    if (native_os == .openbsd) return error.SkipZigTest;
 
     try testWithAllSupportedPathTypes(struct {
         fn impl(ctx: *TestContext) !void {
-- 
2.54.0