Function CopyFile2

phxqueue/comm/utils/file_util.cpp:347–397

// deprecated functions

int CopyFile2(const string &src_file_path, const string &dst_file_path) {
    int src_file{open(src_file_path.c_str(), O_RDONLY, 0)};
    int dst_file{open(dst_file_path.c_str(), O_WRONLY | O_CREAT, 0644)};
    int ret{0};

    if (src_file < 0 || dst_file < 0) {
        ret = errno;
        return ret;
    }

    // struct required, rationale: function stat() exists also
    struct stat src_stat;
    if (-1 == fstat(src_file, &src_stat)) {
        ret = errno;
        // TODO:
        //QLErr("fstat \"%s\" err %d", src_file_path.c_str(), ret);

        close(src_file);
        close(dst_file);

        return ret;
    }

    // TODO(walnuthe): may write fewer bytes than requested
    // should be prepared to retry the call if there were unsent bytes
    // <http://man7.org/linux/man-pages/man2/sendfile.2.html>
    if (-1 == sendfile(dst_file, src_file, 0, src_stat.st_size)) {
        ret = errno;
        // TODO:
        //QLErr("sendfile \"%s\" -> \"%s\" err %d",
        //      src_file_path.c_str(), dst_file_path.c_str(), ret);

        close(src_file);
        close(dst_file);

        return ret;
    }

    if (-1 == close(dst_file)) {
        ret = errno;
        // TODO:
        //QLErr("close \"%s\" err %d", dst_file_path.c_str(), ret);
    }
    if (-1 == close(src_file)) {
        ret = errno;
        // TODO:
        //QLErr("close \"%s\" err %d", src_file_path.c_str(), ret);
    }

    return ret;
}

int RemoveDir2(const string &dir_path, const bool recursive) {
    vector<string> file_paths;