> This looks like a case of memory being overwritten, but it is really hard
> for me to say that this is a libcurl matter or something your application
> does by itself.
> I guess you can't repeat this problem with a much smaller and stand-alone
> plain-C program?

Could you please try this with/without ares, and let me know the results?

#include <stdio.h>
#include <string.h>
#include <sys/time.h>
#include <unistd.h>
#include <curl/curl.h>

char *urls[] = {
  "http://images.sourceforge.net/images/blank.gif",
  "http://images.sourceforge.net/images/navbar.gif",
  "http://ads.osdn.com/?op=iframe&position=1&allpositions=1,2,7&site_id=2",
  "http://images-aud.sourceforge.net/pc.gif?l,6940",

  "http://images.sourceforge.net/images/head_bgx.gif",
  "http://images.sourceforge.net/head_bg_new.gif",
  "http://images.sourceforge.net/images/chrome_bar.png",
  "http://images.sourceforge.net/images/menubar_bg.png",

  "http://images.sourceforge.net/menubar_l.png",
  "http://images.sourceforge.net/div.png",
  "http://images.sourceforge.net/menubar_r.png",
  "http://images.sourceforge.net/images/DB2powered.gif",

  "http://images.sourceforge.net/div_grad_blue.gif",
  "http://images.sourceforge.net/images/blank.gif",
  "http://ads.osdn.com/?op=iframe&position=7&site_id=2",
  "http://images.sourceforge.net/pix.gif",

  "http://images.sourceforge.net/images/mk1.gif",
  "http://images.sourceforge.net/mk2a_notour.gif",
  "http://images.sourceforge.net/images/div_grad.gif",
  "http://images.sourceforge.net/icon_foundry_wht.gif",

  "http://images.sourceforge.net/sf.net_box.gif",
  "http://ads.osdn.com/?op=iframe&position=2&site_id=2"
};

#define NUM_HANDLES sizeof(urls) / sizeof(char *)

size_t write_cb( char *buffer, size_t size,
                 size_t nitems, void *writedata ) {
  printf("%s (%d bytes)\n", (char *)writedata, size*nitems);
  return size*nitems;
}

int main(void) {

  CURL* curls[NUM_HANDLES];
  CURLM* multi;
  int still_running;
  int i;

  multi = curl_multi_init();
  for ( i=0; i < NUM_HANDLES; i++ ) {
    curls[i]=curl_easy_init();
    curl_easy_setopt(curls[i], CURLOPT_URL, urls[i]);
    curl_easy_setopt(curls[i], CURLOPT_CONNECTTIMEOUT, 30);
    curl_easy_setopt(curls[i], CURLOPT_FOLLOWLOCATION, 1);
    curl_easy_setopt(curls[i], CURLOPT_WRITEFUNCTION, write_cb);
    curl_easy_setopt(curls[i], CURLOPT_WRITEDATA, (void *)urls[i]);
    curl_multi_add_handle(multi, curls[i]);
  }

  while ( CURLM_CALL_MULTI_PERFORM ==
            curl_multi_perform(multi, &still_running) );
  while (still_running) {
    struct timeval timeout;
    int rc;
    fd_set fdread;
    fd_set fdwrite;
    fd_set fdexcep;
    int maxfd;
    FD_ZERO(&fdread);
    FD_ZERO(&fdwrite);
    FD_ZERO(&fdexcep);
    timeout.tv_sec = 1;
    timeout.tv_usec = 0;
    curl_multi_fdset(multi, &fdread, &fdwrite, &fdexcep, &maxfd);
    rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
    switch(rc) {
      case -1:
        break;
      case 0:
      default:
        while ( CURLM_CALL_MULTI_PERFORM ==
                  curl_multi_perform(multi, &still_running) );
        break;
    }
  }
  curl_multi_cleanup(multi);
  for ( i=0; i < NUM_HANDLES; i++ ) curl_easy_cleanup(curls[i]);
  return 0;
}

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Received on 2003-09-09