[zeromq-dev] zmq_term hanging

Morten Møller Riis mortenmoellerriis at gmail.com
Mon Sep 23 07:43:57 CEST 2013

Hi guys

I'm having trouble catching SIGTERM and closing socket and context.

I have the following code (I've trimmed it down since a lot of other stuff is happening). I use the global variable term_flag to break the main loop when the program receives SIGTERM.

The problem is that when sending SIGTERM to the program it hangs at zmq_term(). Sending SIGTERM once more closes the program. Why is this happening?

int term_flag = 1;

void term(int signum)
    fprintf(log_fp, "Received %i, closing context and socket...\n", signum);
    fprintf(log_fp, "Exiting.\n");
    term_flag = 0;

int main(int argc, char **argv) {

  signal(SIGTERM, term);
  signal(SIGINT, term);


  while(term_flag) {
    rc = zmq_recv(zmq_sock, &msg, 0);
    if(rc!=0) break;

  zmq_term(zmq_ctx); // hangs here
  return 0;

Best regards
Morten Møller Riis

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