remove signal handler (#641)

Author: sshane

msgq/impl_msgq.cc

@@ -2,20 +2,10 @@
 #include <cstring>
 #include <iostream>
 #include <cstdlib>
-#include <csignal>
 #include <cerrno>
 
 #include "msgq/impl_msgq.h"
 
-
-volatile sig_atomic_t msgq_do_exit = 0;
-
-void sig_handler(int signal) {
-  assert(signal == SIGINT || signal == SIGTERM);
-  msgq_do_exit = 1;
-}
-
-
 MSGQContext::MSGQContext() {
 }
 
@@ -72,23 +62,14 @@ int MSGQSubSocket::connect(Context *context, std::string endpoint, std::string a
 
 
 Message * MSGQSubSocket::receive(bool non_blocking){
-  msgq_do_exit = 0;
-
-  void (*prev_handler_sigint)(int);
-  void (*prev_handler_sigterm)(int);
-  if (!non_blocking){
-    prev_handler_sigint = std::signal(SIGINT, sig_handler);
-    prev_handler_sigterm = std::signal(SIGTERM, sig_handler);
-  }
-
   msgq_msg_t msg;
 
   MSGQMessage *r = NULL;
 
   int rc = msgq_msg_recv(&msg, q);
 
   // Hack to implement blocking read with a poller. Don't use this
-  while (!non_blocking && rc == 0 && msgq_do_exit == 0){
+  while (!non_blocking && rc == 0){
     msgq_pollitem_t items[1];
     items[0].q = q;
 
@@ -107,21 +88,9 @@ Message * MSGQSubSocket::receive(bool non_blocking){
     }
   }
 
-
-  if (!non_blocking){
-    std::signal(SIGINT, prev_handler_sigint);
-    std::signal(SIGTERM, prev_handler_sigterm);
-  }
-
-  errno = msgq_do_exit ? EINTR : 0;
-
   if (rc > 0){
-    if (msgq_do_exit){
-      msgq_msg_close(&msg); // Free unused message on exit
-    } else {
-      r = new MSGQMessage;
-      r->takeOwnership(msg.data, msg.size);
-    }
+    r = new MSGQMessage;
+    r->takeOwnership(msg.data, msg.size);
   }
 
   return (Message*)r;

msgq/ipc_pyx.pyx

@@ -199,11 +199,6 @@ cdef class SubSocket:
     msg = self.socket.receive(non_blocking)
 
     if msg == NULL:
-      # If a blocking read returns no message check errno if SIGINT was caught in the C++ code
-      if errno.errno == errno.EINTR:
-        print("SIGINT received, exiting")
-        sys.exit(1)
-
       return None
     else:
       sz = msg.getSize()