processSetCurrentDir

fn processSetCurrentDir(userdata: ?*anyopaque, dir: Dir) process.SetCurrentDirError!void {
    const t: *Threaded = @ptrCast(@alignCast(userdata));
    _ = t;

    if (native_os == .wasi) return error.OperationUnsupported;

    if (is_windows) {
        var dir_path_buf: [windows.PATH_MAX_WIDE]u16 = undefined;
        const dir_path = try GetFinalPathNameByHandle(dir.handle, .{}, &dir_path_buf);
        const syscall: Syscall = try .start();
        while (true) switch (windows.ntdll.RtlSetCurrentDirectory_U(&.init(dir_path))) {
            .SUCCESS => return syscall.finish(),
            .OBJECT_NAME_INVALID => return syscall.fail(error.BadPathName),
            .OBJECT_NAME_NOT_FOUND => return syscall.fail(error.FileNotFound),
            .OBJECT_PATH_NOT_FOUND => return syscall.fail(error.FileNotFound),
            .NO_MEDIA_IN_DEVICE => return syscall.fail(error.NoDevice),
            .INVALID_PARAMETER => |err| return syscall.ntstatusBug(err),
            .ACCESS_DENIED => return syscall.fail(error.AccessDenied),
            .OBJECT_PATH_SYNTAX_BAD => |err| return syscall.ntstatusBug(err),
            .NOT_A_DIRECTORY => return syscall.fail(error.NotDir),
            .CANCELLED => {
                try syscall.checkCancel();
                continue;
            },
            else => |status| return syscall.unexpectedNtstatus(status),
        };
    }

    return fchdir(dir.handle);
}