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

[Thomas Rodgers]

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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