Solution: move to ip.hpp as zmq::create_ipc_wildcard_address

Solution: Extract TCP/IP loopback variant into zmq_fdpair_tcpip

Solution: now if the first frame in a multipart message is not subscribe/unsubscribe,
the rest of the parts are also considered to be not subscribe/unsubscribe.

Solution: add wss_address_t subclass of ws_address_t to override the
to_string method

Solution: remove the path from the address when resolving

Solution: use the correct address class when resolving

Now only the first part in a multipart message will be treated as subscribe/unsubscribe.
The rest will be considered user messages regardless of the first byte.

WSAEventSelect is used on Windows (when select is the polling method)
only if waiting for more than one socket family, excluding IPv4/6.
It is then passed FD_OOB, which means it can be woken by OOB messages,
but select later on never checks for it.
Remove FD_OOB as it's not actually used for anything.

Solution: call tune_socket only if connect was successful

Solution: implement support

Solution: fix build issues

This reverts commit 765c2474.

ceil function is usually in math library that can be avoided as dependency

Solution: add -lm to Libs.private of libzmq.pc so that the std::ceil
usage in src/decoder_allocators.cpp is satisfied during static linking
on CentOS 7.

See https://github.com/zeromq/libzmq/issues/3710 for a reproducer.

Solution: when a zero-sized message is encoded or decoded avoid mem copy

Solution: disable handshake timeout

Solution: return -1 for errors

Solution: initialize the value

Solution: add capability check to zmq_has

Solution: add support to mechanism

Solution: support websocket with tls (wss)

Solution: Fix behavior of dbuffer on writes. Message passed in argument
of dbuffer::write can be assigned directly to the back buffer without
leaking, since the message has already the right reference count (see
dist::distribute and msg_t::add_refs). Secondly, in order to prevent the
message pending in the front buffer from leaking if it hasn't been
closed yet (for example because the peer is not reachable anymore), move
back buffer to front buffer using msg_t::move instead of swapping the
buffers, thus allowing release of the message in the front buffer.

Solution: allow to use external library (nss) for sha1 to avoid the conflict

Solution: Validate Sec-WebSocket-Protocol and make sure ZWS2.0 is one of the protocols

Solution: extract path and host from the address

Solution: fix regression introduced by:
https://github.com/zeromq/libzmq/pull/3168

Correctly fall back to user message if the first byte is neither 0 nor
1, and add a simple unit test

Fixes https://github.com/zeromq/libzmq/issues/3656

* Introduce DRAFT zmq_ctx_set_ext() and zmq_ctx_get_ext() methods. Change
ZMQ_THREAD_NAME_PREFIX to allow for non-numeric thread name prefixes.

* UDP engine aborts on networking-related errors from socket syscalls #2862

* UDP engine aborts on networking-related errors from socket syscalls #2862

* Add relicense statement

Solution: fix syntax and formatting, remove C-ism for defining struct

Solution: run make clang-format-diff to fix it

solution: Handle as for OpenBSD by not attemption to set this option on the socket
Signed-off-by: Christopher Hall <hsw@ms2.hinet.net>

Solution: fix them with make clang-format-diff

Solution: Manually push/pop an exception registration record.
Only set the thread name with a debugger present

Solution: remove it

Solution: Add ZMQ_HAVE_WINDOWS_TARGET_XP check to src/udp_address.cpp.

Solution: Don't allow concurrent heartbeat timers