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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3710) libhdfs misuses O_RDONLY/WRONLY/RDWR
Date Wed, 08 Aug 2012 19:09:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3710?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13431301#comment-13431301

Hadoop QA commented on HDFS-3710:

+1 overall.  Here are the results of testing the latest attachment 
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 1 new or modified test files.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 eclipse:eclipse.  The patch built with eclipse:eclipse.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit

    +1 core tests.  The patch passed unit tests in hadoop-hdfs-project/hadoop-hdfs.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/2971//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/2971//console

This message is automatically generated.
> libhdfs misuses O_RDONLY/WRONLY/RDWR
> ------------------------------------
>                 Key: HDFS-3710
>                 URL: https://issues.apache.org/jira/browse/HDFS-3710
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: libhdfs
>    Affects Versions: 2.0.0-alpha
>            Reporter: Andy Isaacson
>            Assignee: Andy Isaacson
>            Priority: Minor
>         Attachments: hdfs-3710-2.txt, hdfs-3710-3.txt, hdfs-3710.txt
> The {{O_RDONLY}} / {{O_WRONLY}} / {{O_RDWR}} macros in {{fcntl.h}} are not a bitmask;
they are an enum stored in the low bits of the flag word.  The proper way to use them is
> {code}
> if ((flags & O_ACCMODE) == O_RDONLY)
> {code}
> rather than
> {code}
> if ((flags & O_RDONLY) == 0)
> {code}
> There are many examples of this misuse in {{hdfs.c}}.
> As a result of this incorrect testing, erroneous code may be accepted without error and
correct code might not work correctly.

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