multi-double.c

/*****************************************************************************
 *                                  _   _ ____  _     
 *  Project                     ___| | | |  _ \| |    
 *                             / __| | | | |_) | |    
 *                            | (__| |_| |  _ <| |___ 
 *                             \___|\___/|_| \_\_____|
 *
 * $Id: multi-double.c,v 1.4 2006-10-13 14:01:19 bagder Exp $
 *
 * This is a very simple example using the multi interface.
 */ 
 
#include <stdio.h>
#include <string.h>
 
/* somewhat unix-specific */ 
#include <sys/time.h>
#include <unistd.h>
 
/* curl stuff */ 
#include <curl/curl.h>
 
/*
 * Simply download two HTTP files!
 */ 
int main(int argc, char **argv)
{
  CURL *http_handle;
  CURL *http_handle2;
  CURLM *multi_handle;
 
  int still_running; /* keep number of running handles */ 
 
  http_handle = curl_easy_init();
  http_handle2 = curl_easy_init();
 
  /* set options */ 
  curl_easy_setopt(http_handle, CURLOPT_URL, "http://www.haxx.se/");
 
  /* set options */ 
  curl_easy_setopt(http_handle2, CURLOPT_URL, "http://localhost/");
 
  /* init a multi stack */ 
  multi_handle = curl_multi_init();
 
  /* add the individual transfers */ 
  curl_multi_add_handle(multi_handle, http_handle);
  curl_multi_add_handle(multi_handle, http_handle2);
 
  /* we start some action by calling perform right away */ 
  while(CURLM_CALL_MULTI_PERFORM ==
        curl_multi_perform(multi_handle, &still_running));
 
  while(still_running) {
    struct timeval timeout;
    int rc; /* select() return code */ 
 
    fd_set fdread;
    fd_set fdwrite;
    fd_set fdexcep;
    int maxfd;
 
    FD_ZERO(&fdread);
    FD_ZERO(&fdwrite);
    FD_ZERO(&fdexcep);
 
    /* set a suitable timeout to play around with */ 
    timeout.tv_sec = 1;
    timeout.tv_usec = 0;
 
    /* get file descriptors from the transfers */ 
    curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
 
    /* In a real-world program you OF COURSE check the return code of the
       function calls, *and* you make sure that maxfd is bigger than -1 so
       that the call to select() below makes sense! */ 
 
    rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
 
    switch(rc) {
    case -1:
      /* select error */ 
      break;
    case 0:
    default:
      /* timeout or readable/writable sockets */ 
      while(CURLM_CALL_MULTI_PERFORM ==
            curl_multi_perform(multi_handle, &still_running));
      break;
    }
  }
 
  curl_multi_cleanup(multi_handle);
 
  curl_easy_cleanup(http_handle);
  curl_easy_cleanup(http_handle2);
 
  return 0;
}

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