[zeromq-dev] zmq_msg_copy() of empty message returns EINVAL

[Pieter Hintjens]

There's no good reason for it. If you like, make a patch and get it to
work as you'd expect.

On Wed, Jul 2, 2014 at 8:22 PM, Thomas Rodgers <rodgert at twrodgers.com> wrote:
> Just curious what the rationale for this is?  The result of least
> astonishment (to me anyway) would be a copy of an empty message.
>
> zmq_msg_t a;
> zmq_msg_init(&a);
>
> ...
>
> zmq_msg_t b;
> int rc = zmq_msg_copy(&b, &a);
> assert(rc == 0);  // fails, errno=EINVAL
>
>
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