server_mainloop.c 2.2 KB

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  1. /*
  2. * This work is licensed under a Creative Commons CCZero 1.0 Universal License.
  3. * See http://creativecommons.org/publicdomain/zero/1.0/ for more information.
  4. */
  5. #include <ua_server.h>
  6. #include <ua_config_default.h>
  7. #include <ua_log_stdout.h>
  8. #include <signal.h>
  9. #include <stdlib.h>
  10. UA_Boolean running = true;
  11. static void stopHandler(int sign) {
  12. UA_LOG_INFO(UA_Log_Stdout, UA_LOGCATEGORY_SERVER, "received ctrl-c");
  13. running = false;
  14. }
  15. /* In this example, we integrate the server into an external "mainloop". This
  16. can be for example the event-loop used in GUI toolkits, such as Qt or GTK. */
  17. int main(int argc, char** argv) {
  18. signal(SIGINT, stopHandler);
  19. signal(SIGTERM, stopHandler);
  20. UA_ServerConfig *config = UA_ServerConfig_new_default();
  21. UA_Server *server = UA_Server_new(config);
  22. /* Should the server networklayer block (with a timeout) until a message
  23. arrives or should it return immediately? */
  24. UA_Boolean waitInternal = false;
  25. UA_StatusCode retval = UA_Server_run_startup(server);
  26. if(retval != UA_STATUSCODE_GOOD)
  27. goto cleanup;
  28. while(running) {
  29. /* timeout is the maximum possible delay (in millisec) until the next
  30. _iterate call. Otherwise, the server might miss an internal timeout
  31. or cannot react to messages with the promised responsiveness. */
  32. /* If multicast discovery server is enabled, the timeout does not not consider new input data (requests) on the mDNS socket.
  33. * It will be handled on the next call, which may be too late for requesting clients.
  34. * if needed, the select with timeout on the multicast socket server->mdnsSocket (see example in mdnsd library)
  35. */
  36. UA_UInt16 timeout = UA_Server_run_iterate(server, waitInternal);
  37. /* Now we can use the max timeout to do something else. In this case, we
  38. just sleep. (select is used as a platform-independent sleep
  39. function.) */
  40. struct timeval tv;
  41. tv.tv_sec = 0;
  42. tv.tv_usec = timeout * 1000;
  43. select(0, NULL, NULL, NULL, &tv);
  44. }
  45. retval = UA_Server_run_shutdown(server);
  46. cleanup:
  47. UA_Server_delete(server);
  48. UA_ServerConfig_delete(config);
  49. return retval == UA_STATUSCODE_GOOD ? EXIT_SUCCESS : EXIT_FAILURE;
  50. }