Hi!

I have seen in the documentation that the fd field in zmq_pollitem_t should be 
ignored if a ZMQ socket is also present in the structure. I have thought of 
using this field to store additional information for the socket. 

I poll many sockets that all of them use the same function to be processed but 
the arguments differ, so I use the fd as a pointer to an structure where I 
store this arguments.

Is there any other option to do this polling scheme?

Best regards,

    Juan
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