关于 c :ZeroMQ: 如何对 EINTR 上的不同信号类型做出反应

<code to connect inSock to something>

pollOnThese[0].socket = NULL;       // This item is not polling a ZMQ socket
pollOnThese[0].fd = 0;              // Poll on stdin. 0 is the fd for stdin
pollOnThese[0].event = ZMQ_POLLIN;

pollOnThese[1].socket = &inSock;    // This item polls inSock
pollOnThese[1].fd = 0;              // This field is ignored because socket isn’t NULL
pollOnThese[1].event = ZMQ_POLLIN;

while (!quitLoop)
{
   zmq::poll(pollOnThese,2);

   if (pollOnThese[0].revents == ZMQ_POLLIN)
   {
      // A key has been pressed, read it
      char c;
      read(0, &c, 1);

      if (c == ‘c’)
      {
         quitloop = 1;
      }
   }
   if (pollOnThese[1].revent == ZMQ_POLLIN)
   {
      // Handle inSock as required
   }
}

<code to connect inSock to something>

<install a signal handler that handles SIGINT by setting quitLoop to 1>

pollOnThis.socket = &inSock;    // This item polls inSock
pollOnThis.fd = 0;              // This field is ignored because socket isn’t NULL
pollOnThis.event = ZMQ_POLLIN;

while (!quitLoop)
{
   try
   {
      zmq::poll(&pollOnThis, 1);
   }
   catch (zmq::error_t &ex)
   {
      if (ex.num() != EINTR)
      {
         throw;
      }
   }

   if (pollOnThis.revent == ZMQ_POLLIN && !quitLoop)
   {
      // Handle inSock as required
      bool keepReading = true;
      do
      {
         try
         {
            inSock.recv(&message)
            keepReading = false;
         }
         catch (zmq::error_t &ex)
         {
            if (ex.num() != EINTR)
            {
               throw;
            }
            else
            {
               // We also may want to test quitFlag here because the signal,
               // being asynchronous, may have been delivered mid recv()
               // and the handler would have set quitFlag.
               if (quitFlag)
               {
                  // Abort
                  keepReading = false;
               }
               else
               {
                  // Some other signal interrupted things
                  // What to do? Poll has said a message can be read without blocking.
                  // But does EINTR mean that that meassage has been partially read?
                  // Has one of the myriad of system calls that underpin recv() aborted?
                  // Is the recv() restartable? Documentation doesn’t say.
                  // Have a go anyway.
                  keepReading = true;
               }
            } // if
         } // catch
      }
      while (keepReading);

      <repeat this loop for every single zmq:: recv and zmq::send>
   }
}