Problem with getFlags() method in NetworkInterface.c (original) (raw)

Shirish Kuncolienkar shirishk at linux.vnet.ibm.com
Thu Aug 9 06:16:18 PDT 2012

On 8/9/2012 4:55 PM, Chris Hegarty wrote:

Shirish,

I am not familiar with VIPA interfaces, but I don't see any documentation that describes allowable values for flags that could cause the integer representing it to contain a negative value. I'm not opposed to the source changes, I just don't see that they are required. Can you please help explain? Thanks, -Chris. On 09/08/12 11:16, Shirish Kuncolienkar wrote: Hi,

The return value from the getFlags() method in NetworkInterface.c is interpreted in 2 ways. - If the value is negative an Exception is thrown - Else the return value is considered as the flag mask obtained via the ioctl call. In rare cases is it possible the value in the ifrflags could be negative. One such case is VIPA interfaces. any calls like isUp() on such network interfaces would end up in a Socket Exception. I have patch for this. Anyone would like to take a look ? http://cr.openjdk.java.net/~luchsh/webrev20120809/ -Shirish Chris,

I agree there is no general documentation available, AIX defines vipa interface flag as "0x80000000" Here is a similar bug report related to FreeBSD http://hg.openjdk.java.net/macosx-port/macosx-port/jdk/rev/c6334146005c. A different fix was proposed here.

Hope this helps.

Thanks -Shirish

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