/*** Test to make sure we don't get stuck polling a dbus connection* which has no data on the socket.  This was an issue where* one pending call would read all the data off the bus* and the second pending call would not check to see* if its data had already been read before polling the connection* and blocking.**/#include <dbus/dbus.h>#include <dbus/dbus-sysdeps.h>#include <stdio.h>#include <stdlib.h>static void_run_iteration (DBusConnection *conn){  DBusPendingCall *echo_pending;  DBusPendingCall *dbus_pending;  DBusMessage *method;  DBusMessage *reply;  char *echo = "echo";  /* send the first message */  method = dbus_message_new_method_call ("org.freedesktop.DBus.TestSuiteEchoService",                                         "/org/freedesktop/TestSuite",                                         "org.freedesktop.TestSuite",                                         "Echo");  dbus_message_append_args (method, DBUS_TYPE_STRING, &echo, NULL);  dbus_connection_send_with_reply (conn, method, &echo_pending, -1);  dbus_message_unref (method);    /* send the second message */  method = dbus_message_new_method_call (DBUS_SERVICE_DBUS,                                         DBUS_PATH_DBUS,                                         "org.freedesktop.Introspectable",                                         "Introspect");  dbus_connection_send_with_reply (conn, method, &dbus_pending, -1);  dbus_message_unref (method);  /* block on the second message (should return immediately) */  dbus_pending_call_block (dbus_pending);  /* block on the first message */  /* if it does not return immediately chances      are we hit the block in poll bug */  dbus_pending_call_block (echo_pending);  /* check the reply only to make sure we     are not getting errors unrelated     to the block in poll bug */  reply = dbus_pending_call_steal_reply (echo_pending);  if (reply == NULL)    {      printf ("Failed: Reply is NULL ***\n");      exit (1);    }  if (dbus_message_get_type (reply) == DBUS_MESSAGE_TYPE_ERROR)    {      printf ("Failed: Reply is error: %s ***\n", dbus_message_get_error_name (reply));      exit (1);    }   dbus_message_unref (reply);  dbus_pending_call_unref (dbus_pending);  dbus_pending_call_unref (echo_pending);  }intmain (int argc, char *argv[]){  long start_tv_sec, start_tv_usec;  long end_tv_sec, end_tv_usec;  int i;  DBusMessage *method;  DBusConnection *conn;  DBusError error;  /* Time each iteration and make sure it doesn't take more than 5 seconds     to complete.  Outside influences may cause connections to take longer     but if it does and we are stuck in a poll call then we know the      stuck in poll bug has come back to haunt us */  printf ("*** Testing stuck in poll\n");  dbus_error_init (&error);  conn = dbus_bus_get (DBUS_BUS_SESSION, &error);  /* run 100 times to make sure */  for (i = 0; i < 100; i++)    {      long delta;            _dbus_get_current_time (&start_tv_sec, &start_tv_usec);      _run_iteration (conn);      _dbus_get_current_time (&end_tv_sec, &end_tv_usec);      /* we just care about seconds */      delta = end_tv_sec - start_tv_sec;      printf ("Iter %i: %lis\n", i, delta);      if (delta >= 5)        {	  printf ("Failed: looks like we might have been be stuck in poll ***\n");	  exit (1);	}    }   method = dbus_message_new_method_call ("org.freedesktop.TestSuiteEchoService",                                         "/org/freedesktop/TestSuite",                                         "org.freedesktop.TestSuite",                                         "Exit");  dbus_connection_send (conn, method, NULL);  dbus_message_unref (method);  printf ("Success ***\n");  exit (0);}