Function copy_file

src/operations.cpp:3008–3361

}

BOOST_FILESYSTEM_DECL
bool copy_file(path const& from, path const& to, copy_options options, error_code* ec)
{
    BOOST_ASSERT((((options & copy_options::overwrite_existing) != copy_options::none) +
        ((options & copy_options::skip_existing) != copy_options::none) +
        ((options & copy_options::update_existing) != copy_options::none)) <= 1);

    if (ec)
        ec->clear();

#if defined(BOOST_FILESYSTEM_POSIX_API)

    int err = 0;

    // Note: Declare fd wrappers here so that errno is not clobbered by close() that may be called in fd wrapper destructors
    boost::scope::unique_fd infile, outfile;

    while (true)
    {
        infile.reset(::open(from.c_str(), O_RDONLY | O_CLOEXEC));
        if (BOOST_UNLIKELY(!infile))
        {
            err = errno;
            if (err == EINTR)
                continue;

        fail:
            emit_error(err, from, to, ec, "boost::filesystem::copy_file");
            return false;
        }

        break;
    }

#if defined(BOOST_FILESYSTEM_USE_STATX)
    unsigned int statx_data_mask = STATX_TYPE | STATX_MODE | STATX_INO | STATX_SIZE;
    if ((options & copy_options::update_existing) != copy_options::none)
        statx_data_mask |= STATX_MTIME;

    struct ::statx from_stat;
    if (BOOST_UNLIKELY(invoke_statx(infile.get(), "", AT_EMPTY_PATH | AT_NO_AUTOMOUNT, statx_data_mask, &from_stat) < 0))
    {
    fail_errno:
        err = errno;
        goto fail;
    }

    if (BOOST_UNLIKELY((from_stat.stx_mask & statx_data_mask) != statx_data_mask))
    {
        err = ENOSYS;
        goto fail;
    }
#else
    struct ::stat from_stat;
    if (BOOST_UNLIKELY(::fstat(infile.get(), &from_stat) != 0))
    {
    fail_errno:
        err = errno;