Create action running on trashed_post hook to modify post_meta value

wp_trash_post and trashed_post – from source:

function wp_trash_post($post_id = 0) {
    if ( !EMPTY_TRASH_DAYS )
        return wp_delete_post($post_id, true);

    if ( !$post = wp_get_single_post($post_id, ARRAY_A) )
        return $post;

    if ( $post['post_status'] == 'trash' )
        return false;

    do_action('wp_trash_post', $post_id);

    add_post_meta($post_id,'_wp_trash_meta_status', $post['post_status']);
    add_post_meta($post_id,'_wp_trash_meta_time', time());

    $post['post_status'] = 'trash';
    wp_insert_post($post);

    wp_trash_post_comments($post_id);

    do_action('trashed_post', $post_id);

    return $post;
}