dragonfly: pass test: lib/std/std.zig

Author: mikdusan

lib/std/fs/test.zig

@@ -446,8 +446,8 @@ test "file operations on directories" {
     try testing.expectError(error.IsDir, tmp_dir.dir.createFile(test_dir_name, .{}));
     try testing.expectError(error.IsDir, tmp_dir.dir.deleteFile(test_dir_name));
     switch (builtin.os.tag) {
-        // NetBSD does not error when reading a directory.
-        .netbsd => {},
+        // no error when reading a directory.
+        .dragonfly, .netbsd => {},
         // Currently, WASI will return error.Unexpected (via ENOTCAPABLE) when attempting fd_read on a directory handle.
         // TODO: Re-enable on WASI once https://github.com/bytecodealliance/wasmtime/issues/1935 is resolved.
         .wasi => {},

lib/std/os.zig

@@ -2696,6 +2696,8 @@ pub fn mkdiratZ(dir_fd: fd_t, sub_dir_path: [*:0]const u8, mode: u32) MakeDirErr
         .NOSPC => return error.NoSpaceLeft,
         .NOTDIR => return error.NotDir,
         .ROFS => return error.ReadOnlyFileSystem,
+        // dragonfly: when dir_fd is unlinked from filesystem
+        .NOTCONN => return error.FileNotFound,
         else => |err| return unexpectedErrno(err),
     }
 }