Function is_empty

src/operations.cpp:4068–4165

);

BOOST_FILESYSTEM_DECL
bool is_empty(path const& p, system::error_code* ec)
{
    if (ec)
        ec->clear();

#if defined(BOOST_FILESYSTEM_POSIX_API)

    boost::scope::unique_fd file;
    int err = 0;
    while (true)
    {
        file.reset(::open(p.c_str(), O_RDONLY | O_CLOEXEC));
        if (BOOST_UNLIKELY(!file))
        {
            err = errno;
            if (err == EINTR)
                continue;

        fail:
            emit_error(err, p, ec, "boost::filesystem::is_empty");
            return false;
        }

        break;
    }

#if defined(BOOST_FILESYSTEM_NO_O_CLOEXEC) && defined(FD_CLOEXEC)
    if (BOOST_UNLIKELY(::fcntl(file.get(), F_SETFD, FD_CLOEXEC) < 0))
    {
        err = errno;
        goto fail;
    }
#endif

#if defined(BOOST_FILESYSTEM_USE_STATX)
    struct ::statx path_stat;
    if (BOOST_UNLIKELY(invoke_statx(file.get(), "", AT_EMPTY_PATH | AT_NO_AUTOMOUNT, STATX_TYPE | STATX_SIZE, &path_stat) < 0))
    {
        err = errno;
        goto fail;
    }

    if (BOOST_UNLIKELY((path_stat.stx_mask & (STATX_TYPE | STATX_SIZE)) != (STATX_TYPE | STATX_SIZE)))
    {
        err = BOOST_ERROR_NOT_SUPPORTED;
        goto fail;
    }
#else
    struct ::stat path_stat;
    if (BOOST_UNLIKELY(::fstat(file.get(), &path_stat) < 0))
    {
        err = errno;
        goto fail;
    }
#endif

    const mode_t mode = get_mode(path_stat);