multi-poll.c

#include <stdio.h>
#include <string.h>

/* somewhat unix-specific */
#include <sys/time.h>
#include <unistd.h>

/* curl stuff */
#include <curl/curl.h>

#define COUNT 10
#define URL "example.org:8200"

int main(void)
{
  CURL *http_handles[COUNT];
  CURLM *multi_handle;
  int still_running = 1; /* keep number of running handles */

  curl_global_init(CURL_GLOBAL_DEFAULT);

  multi_handle = curl_multi_init();
  curl_multi_setopt(multi_handle, CURLMOPT_MAX_TOTAL_CONNECTIONS, 1l);

  for (int i = 0 ; i < COUNT ; i++) {
    http_handles[i] = curl_easy_init();
    curl_easy_setopt(http_handles[i], CURLOPT_URL, URL);
    curl_easy_setopt(http_handles[i], CURLOPT_TIMEOUT_MS, 1000l);
    curl_multi_add_handle(multi_handle, http_handles[i]);
  }

  while(still_running) {
    CURLMcode mc; /* curl_multi_poll() return code */
    int numfds;

    /* we start some action by calling perform right away */
    mc = curl_multi_perform(multi_handle, &still_running);

    if(still_running)
      /* wait for activity, timeout or "nothing" */
      mc = curl_multi_poll(multi_handle, NULL, 0, 100, &numfds);

    if(mc != CURLM_OK) {
      fprintf(stderr, "curl_multi_wait() failed, code %d.\n", mc);
      break;
    }
  }

  for (int i = 0 ; i < COUNT ; i++) {
    curl_multi_remove_handle(multi_handle, http_handles[i]);
    curl_easy_cleanup(http_handles[i]);
  }

  curl_multi_cleanup(multi_handle);
  curl_global_cleanup();

  return 0;
}