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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2880) libhdfs: O_WRONLY/O_RDONLY different when including fcntl.h
Date Tue, 25 Mar 2008 06:03:35 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12581784#action_12581784
] 

dhruba borthakur commented on HADOOP-2880:
------------------------------------------

This might be termed as an "incompatible" change. 

> libhdfs: O_WRONLY/O_RDONLY different when including fcntl.h
> -----------------------------------------------------------
>
>                 Key: HADOOP-2880
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2880
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: libhdfs
>         Environment: linux
>            Reporter: Koji Noguchi
>            Priority: Blocker
>             Fix For: 0.17.0
>
>
> In hdfs.h, 
> #ifndef O_RDONLY
> #define O_RDONLY 1
> #endif
> #ifndef O_WRONLY
> #define O_WRONLY 2
> #endif
> but on linux, 
> $ grep "define O_RDONLY" /usr/include/*/*
> /usr/include/asm-i386/fcntl.h:#define O_RDONLY       00
> /usr/include/asm-x86_64/fcntl.h:#define O_RDONLY             00
> /usr/include/bits/fcntl.h:#define O_RDONLY           00
> $ grep "define O_WRONLY" /usr/include/*/*
> /usr/include/asm-i386/fcntl.h:#define O_WRONLY       01
> /usr/include/asm-x86_64/fcntl.h:#define O_WRONLY             01
> /usr/include/bits/fcntl.h:#define O_WRONLY           01
> It took me a while to debug when hdfsOpenFile was trying to 'write' when I meant 'read'.

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