RFR: 7131399: Poll system call appears to be broken on Mac OS [macosx] (original) (raw)

Michael McMahon michael.x.mcmahon at oracle.com
Mon Jan 23 14:32:40 PST 2012

On 23/01/12 21:30, Alan Bateman wrote:

On 23/01/2012 17:09, Michael McMahon wrote:

Can I get the following change reviewed please?

http://cr.openjdk.java.net/~michaelm/7131399/webrev.1/ The problem is that poll(2) doesn't seem to work in a specific edge case tested by JCK, namely, when a zero length UDP message is sent on a DatagramSocket. The problem is only detected on timed reads, ie. normal blocking reads work fine. The fix is to make the NETTimeout() function use select() instead of poll(). Thanks, Michael. The first argument to select is s+1, shouldn't is be 1? -alan No, I don't think so. fd_sets are bit masks and you have to specify the highest numbered bit in the mask (+1).

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