RFR 8075484:SocketInputStream.socketRead0 can hang even with soTimeout set

[Vyom Tewari]

gentle reminder, please review the below code change.

Vyom


On Monday 22 August 2016 05:12 PM, Vyom Tewari wrote:
> Hi All,
>
> Please review the code changes for below issue.
>
> Bug         : https://bugs.openjdk.java.net/browse/JDK-8075484
>
> webrev    : 
> http://cr.openjdk.java.net/~vtewari/8075484/webrev0.0/index.html 
> <http://cr.openjdk.java.net/%7Evtewari/8075484/webrev0.0/index.html>
>
> This issue is SocketInputStream.socketread0() hangs even with 
> "soTimeout" set.the implementation of 
> Java_java_net_SocketInputStream_socketRead0 assumes that read() won't 
> block after poll() reports that a read is possible.
>
> This assumption does not hold, as noted on the man page for select 
> (referenced by the man page for poll): Under Linux, select() may 
> report a socket file descriptor as "ready for reading", while 
> nevertheless a subsequent read blocks. This could for example happen 
> when data has arrived but upon examination has wrong checksum and is 
> discarded.
>
> Thanks,
>
> Vyom
>
>