I set up a source handler on a TCP socket like this:
    dispatch_source_t newsrc = 
dispatch_source_create(DISPATCH_SOURCE_TYPE_READ,sockfd,0,globalQueue); 

It works well, and when a client process closes his socket my cancel_handler 
gets called, I clean up, and life is good. But if I do a close(sockfd) from my 
side, my cancel_handler doesn't get invoked. I have to explicitly do a 
dispatch_source_cancel(). Shouldn't closing the socket be enough to cause my 
cancel_handler to be run?

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