Function init_copy_file_data_impl

src/operations.cpp:1007–1027

Initializes copy_file_data implementation pointer

//! Initializes copy_file_data implementation pointer
inline void init_copy_file_data_impl(unsigned int major_ver, unsigned int minor_ver, unsigned int patch_ver)
{
#if defined(BOOST_FILESYSTEM_USE_SENDFILE) || defined(BOOST_FILESYSTEM_USE_COPY_FILE_RANGE)
    copy_file_data_t* cfd = &copy_file_data_read_write;

#if defined(BOOST_FILESYSTEM_USE_SENDFILE)
    // sendfile started accepting file descriptors as the target in Linux 2.6.33
    if (major_ver > 2u || (major_ver == 2u && (minor_ver > 6u || (minor_ver == 6u && patch_ver >= 33u))))
        cfd = &check_fs_type< copy_file_data_preallocate< copy_file_data_sendfile > >;
#endif

#if defined(BOOST_FILESYSTEM_USE_COPY_FILE_RANGE)
    // Although copy_file_range appeared in Linux 4.5, it did not support cross-filesystem copying until 5.3.
    // copy_file_data_copy_file_range will fallback to copy_file_data_sendfile if copy_file_range returns EXDEV.
    if (major_ver > 4u || (major_ver == 4u && minor_ver >= 5u))
        cfd = &check_fs_type< copy_file_data_preallocate< copy_file_data_copy_file_range > >;
#endif

    filesystem::detail::atomic_store_relaxed(copy_file_data, cfd);
#endif // defined(BOOST_FILESYSTEM_USE_SENDFILE) || defined(BOOST_FILESYSTEM_USE_COPY_FILE_RANGE)
}

#endif // defined(linux) || defined(__linux) || defined(__linux__)