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ASF GitHub Bot logged work on HDFS-16463: ----------------------------------------- Author: ASF GitHub Bot Created on: 06/Jun/22 16:44 Start Date: 06/Jun/22 16:44 Worklog Time Spent: 10m Work Description: GauthamBanasandra commented on code in PR #4370: URL: https://github.com/apache/hadoop/pull/4370#discussion_r890332363 ########## hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/x-platform/c-api/dirent.cc: ########## @@ -0,0 +1,100 @@ +/** + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include <algorithm> +#include <cerrno> +#include <iostream> +#include <iterator> +#include <system_error> +#include <variant> + +#include "x-platform/c-api/dirent.h" +#include "x-platform/dirent.h" + +#if defined(WIN32) && defined(__cplusplus) Review Comment: The C++ compiler will mangle the method signature. Since these APIs are invoked in [jni_helper.c](https://github.com/apache/hadoop/blob/a234d00c1ce57427202d4c9587f891ec0164d10c/hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfs/jni_helper.c) (which is compiled by C compiler), the C linker won't be able to find the mangled version of these methods. Thus, we need to wrap the implementation with an `extern "C"` block to prevent the C++ compiler from mangling these APIs. It results in an `Undefined reference error` otherwise. This is the standard approach whenever C code tries to invoke C++ code. Issue Time Tracking ------------------- Worklog Id: (was: 778690) Time Spent: 3.5h (was: 3h 20m) > Make dirent cross platform compatible > ------------------------------------- > > Key: HDFS-16463 > URL: https://issues.apache.org/jira/browse/HDFS-16463 > Project: Hadoop HDFS > Issue Type: Improvement > Components: libhdfs++ > Affects Versions: 3.4.0 > Environment: Windows 10 > Reporter: Gautham Banasandra > Assignee: Gautham Banasandra > Priority: Major > Labels: libhdfscpp, pull-request-available > Time Spent: 3.5h > Remaining Estimate: 0h > > [jnihelper.c|https://github.com/apache/hadoop/blob/1fed18bb2d8ac3dbaecc3feddded30bed918d556/hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfs/jni_helper.c#L28] > in HDFS native client uses *dirent.h*. This header file isn't available on > Windows. Thus, we need to replace this with a cross platform compatible > implementation for dirent. -- This message was sent by Atlassian Jira (v8.20.7#820007) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org