Problem: zmq_poller does not fail with ETERM when context shutdown

[jean-airoldie]

Issue description

zmq_poller does not return ETERM when a registed socket's context is shutdown if no flags is specified. Note that this is only an issue when no flag is specified.

Environment

• libzmq: 501f9d8
• OS: fedora 29

Minimal test code / Steps to reproduce the issue

1. Create a zmq_poller.
2. Create and register a socket in the poller with no flags specified (0).
3. Call zmq_ctx_shutdown on the context of the registered socket.
4. Call zmq_poller_wait with no timeout (-1) on the poller.

What's the actual result? (include assertion message & call stack if applicable)

The call to zmq_poller_wait blocks forever.

What's the expected result?

Since the context of one of the registered socket was terminated, the call to zmq_poller_wait should fail with ETERM, as specified in the docs.

[sigiesec]

If you have a poller that only has one or more sockets without any flags registered, it can never return succesfully. Calling zmq_poller_wait with an infinite timeout in this case should probably fail with EINVAL immediately, independently from the shutdown of the context.

[stale]

This issue has been automatically marked as stale because it has not had activity for 365 days. It will be closed if no further activity occurs within 56 days. Thank you for your contributions.