Function open_directory

src/directory.cpp:121–163

Opens a directory file and returns a file descriptor. Returns a negative value in case of error.

//! Opens a directory file and returns a file descriptor. Returns a negative value in case of error.
boost::scope::unique_fd open_directory(path const& p, directory_options opts, system::error_code& ec)
{
    ec.clear();

    int flags = O_DIRECTORY | O_RDONLY | O_NONBLOCK | O_CLOEXEC;

#if defined(BOOST_FILESYSTEM_HAS_FDOPENDIR_NOFOLLOW)
    if ((opts & directory_options::_detail_no_follow) != directory_options::none)
        flags |= O_NOFOLLOW;
#endif

    int res;
    while (true)
    {
        res = ::open(p.c_str(), flags);
        if (BOOST_UNLIKELY(res < 0))
        {
            const int err = errno;
            if (err == EINTR)
                continue;
            ec = system::error_code(err, system::system_category());
            return boost::scope::unique_fd();
        }

        break;
    }

#if defined(BOOST_FILESYSTEM_NO_O_CLOEXEC) && defined(FD_CLOEXEC)
    boost::scope::unique_fd fd(res);

    res = ::fcntl(fd.get(), F_SETFD, FD_CLOEXEC);
    if (BOOST_UNLIKELY(res < 0))
    {
        const int err = errno;
        ec = system::error_code(err, system::system_category());
        return boost::scope::unique_fd();
    }

    return fd;
#else
    return boost::scope::unique_fd(res);
#endif
}

#if defined(BOOST_FILESYSTEM_HAS_POSIX_AT_APIS)