Solution: reduce to newly extracted function clear, which does not use the freed pointer

Solution: add code to make non-use explicit

Solution: call check_read instead

Solution: add explicit

Fixed compilation with ZMQ_ATOMIC_PTR_MUTEX

Reenable DRAFT builds on Appveyor and fix test_radio_dish_udp_ipv6

Solution: fix handling of sockaddr in recvfrom

Solution: fix types

Solution: set ENABLE_DRAFTS=ON

Problem: test_spec_dealer not using test framework

Solution: migrate to Unity

Warnings in Windows builds

Solution: handle types properly

Solution: Use fd_t

Solution: Use size_t instead of int

Solution: Use unsigned char instead of size_t

Solution: Use unsigned char instead of size_t

Solution: Use fd_t

Solution: Use fd_t

Solution: explicitly compare function pointer against NULL

Solution: make proper boolean expression

Solution: make proper boolean expression

Solution: move conditional include directive to precompiled.hpp

Solution: fix type specification

Solution: fix type specification

Solution: enable warnings-as-errors

Problem: zmq_poller_[add/modify] accept invalid events arguments silently

Problem: heartbeat tests are disabled

Solution: use a typedef instead

Solution: check and return an error on invalid arguments. Fixes #3088

Solution: re-enable them

Solution: extract common code into functions

Add poller docs

Solution: add symlinks to zmq_poller.txt

Solution: add initial documentation

Solution: return NULL and set errno to ENOMEM

Solution: change comment, and add test case for zmq_poller_modify with events == 0

Problem: inconsistent behaviour of zmq_poller_add and zmq_poller_add_fd in case of memory exhaustion

Solution: always return -1 with errno == ENOMEM

ZMTP 3.1 PING Context not implemented