processSetCurrentDir

fn processSetCurrentDir(userdata: ?*anyopaque, dir: Dir) process.SetCurrentDirError!void {
    const ev: *Evented = @ptrCast(@alignCast(userdata));
    _ = ev;
    if (dir.handle == c.AT.FDCWD) return;
    while (true) switch (c.errno(c.fchdir(dir.handle))) {
        .SUCCESS => return,
        .INTR => {},
        .ACCES => return error.AccessDenied,
        .NOTDIR => return error.NotDir,
        .IO => return error.FileSystem,
        .BADF => |err| return errnoBug(err),
        else => |err| return unexpectedErrno(err),
    };
}