BUG:

[ffa-grahamdawes]

This is a pyzmq bug

• This is a pyzmq-specific bug, not an issue of zmq socket behavior. Don't worry if you're not sure! We'll figure it out together.

What pyzmq version?

27.1.0

What libzmq version?

4.3.5

Python version (and how it was installed)

3.12 via Python.org

OS

Windows 11 x64

What happened?

zmq.zmq_errno() returns 22 after creating a socket.

The example program produces the following output

ZMQ errno 0 No error
ZMQ errno 22 Invalid argument

The socket doesn't seem to be able to receive messages but it can send them. However, this could be unrelated to the error code.

Code to reproduce bug

import zmq
context = zmq.Context()
print(f"ZMQ errno {zmq.zmq_errno()} {zmq.strerror(zmq.zmq_errno())}")
socket = context.socket(zmq.DEALER)
print(f"ZMQ errno {zmq.zmq_errno()} {zmq.strerror(zmq.zmq_errno())}")

Traceback, if applicable

More info

No response

[minrk]

zmq_errno is only meaningful when there's been an error, it doesn't mean that there is an error. Behavior is undefined if there is no error. pyzmq turns errors into Python Exceptions, so there isn't generally a reason to call zmq_errno unless you are currently handling an Exception raised by pyzmq (at which point it's also available as exception.errno.