When using inproc mode, the closure of an open socket will still affect the creation of new sockets

[szn409]

#include "zmq.hpp"
#include "fmt/format.h"
#include <thread>

using namespace std::chrono_literals;

int main()
{
  zmq::context_t ctx;
  int            count = 0;

  for (int i = 0; i < 3; ++i)
  {
    try
    {
      while (true)
      {
        zmq::socket_t sock(ctx, zmq::socket_type::pull);
        sock.set(zmq::sockopt::linger, 0);
        sock.connect("inproc://szn");
        ++count;
      }
    }
    catch (std::exception& e)
    {
      fmt::print("got error: {}, count is {}\n", e.what(), count);
      count = 0;
      std::this_thread::sleep_for(5s);
    }
  }

  return 0;
}
/*
got error: Too many open files, count is 1023
got error: Too many open files, count is 0
got error: Too many open files, count is 0
*/