Commit 47c5f556c08c1b15c74dbaca743d17a3297bcdef | zig

author	Igor Anić <igor.anic@gmail.com> 2026-08-01 13:41:45+02:00
committer	Matthew Lugg <mlugg@mlugg.co.uk> 2026-08-01 23:46:10+02:00
log	47c5f556c08c1b15c74dbaca743d17a3297bcdef
tree	1fe7819435a81b5b9fb5b367d943a0a471f912ce
parent	c854c6577a0720fc538f55d9e2a65621172035eb

Io.Uring: fix dir.hardLink

Unsupported flags is used resulting in invalid arguments:
```Zig
thread 556130 panic: programmer bug caused syscall error: INVAL
.../lib/std/Io/Threaded.zig:14258:34: 0x116f3fa in errnoBug (std.zig)
    if (is_debug) std.debug.panic("programmer bug caused syscall error: {t}", .{err});
                                 ^
.../lib/std/Io/Uring.zig:5583:44: 0x1281981 in linkat (std.zig)
            .INVAL => |err| return errnoBug(err),
                                           ^
.../lib/std/Io/Uring.zig:3555:21: 0x1289ab9 in dirHardLink (std.zig)
    return ev.linkat(```
```

```Zig
test "linkat" {
    const gpa = testing.allocator;

    var uring: Io.Uring = undefined;
    try uring.init(gpa, .{});
    defer uring.deinit();

    var threaded = Io.Threaded.init(gpa, .{});
    defer threaded.deinit();

    for ([_]Io{ threaded.io(), uring.io() }) |io| {
        var tmp = testing.tmpDir(.{});
        defer tmp.cleanup();
        const dir = tmp.dir;

        const dir2 = try dir.createDirPathOpen(io, "folder/sub_folder", .{});
        defer dir2.close(io);

        const file = try dir.createFile(io, "file", .{});
        defer file.close(io);
        try dir.hardLink("file", dir2, "link", io, .{});
        try file.hardLink(io, dir2, "link2", .{});

        var stat = try dir.statFile(io, "folder/sub_folder/link", .{});
        try testing.expectEqual(.file, stat.kind);
        stat = try dir.statFile(io, "folder/sub_folder/link2", .{});
        try testing.expectEqual(.file, stat.kind);
    }
}
```

1 files changed, 4 insertions(+), 2 deletions(-)

lib
- std
  - Io
    Uring.zig

lib/std/Io/Uring.zig+4-2

...	...	@@ -3561,7 +3561,7 @@ fn dirHardLink(
3561	3561	old_sub_path_posix,
3562	3562	new_dir.handle,
3563	3563	new_sub_path_posix,
3564		if (options.follow_symlinks) 0 else linux.AT.SYMLINK_NOFOLLOW,
	3564	if (options.follow_symlinks) linux.AT.SYMLINK_FOLLOW else 0,
3565	3565	);
3566	3566	}
3567	3567
...	...	@@ -3993,7 +3993,7 @@ fn fileHardLink(
3993	3993	"",
3994	3994	new_dir.handle,
3995	3995	new_sub_path_posix,
3996		linux.AT.EMPTY_PATH \| @as(u32, if (options.follow_symlinks) 0 else linux.AT.SYMLINK_NOFOLLOW),
	3996	linux.AT.EMPTY_PATH \| @as(u32, if (options.follow_symlinks) linux.AT.SYMLINK_FOLLOW else 0),
3997	3997	);
3998	3998	}
3999	3999
...	...	@@ -5545,6 +5545,8 @@ fn linkat(
5545	5545	new_path: [*:0]const u8,
5546	5546	flags: u32,
5547	5547	) File.HardLinkError!void {
	5548	// allowed flags: https://man7.org/linux/man-pages/man2/linkat.2.html
	5549	assert(flags & ~(@as(u32, linux.AT.SYMLINK_FOLLOW \| linux.AT.EMPTY_PATH)) == 0);
5548	5550	while (true) {
5549	5551	const thread = try cancel_region.awaitIoUring();
5550	5552	thread.enqueue().* = .{