CMakeLua/Utilities/cmcurl-7.19.0/docs/examples/sendrecv.c

   1 /*****************************************************************************
   2  *                                  _   _ ____  _
   3  *  Project                     ___| | | |  _ \| |
   4  *                             / __| | | | |_) | |
   5  *                            | (__| |_| |  _ <| |___
   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  * An example of curl_easy_send() and curl_easy_recv() usage.
   9  *
  10  * $Id: sendrecv.c,v 1.1.1.1 2008-09-23 16:32:05 hoffman Exp $
  11  */
  12
  13 #include <stdio.h>
  14 #include <string.h>
  15 #include <curl/curl.h>
  16
  17 /* Auxiliary function that waits on the socket. */
  18 static int wait_on_socket(int sockfd, int for_recv, long timeout_ms)
  19 {
  20   struct timeval tv;
  21   fd_set infd, outfd, errfd;
  22   int res;
  23
  24   tv.tv_sec = timeout_ms / 1000;
  25   tv.tv_usec= (timeout_ms % 1000) * 1000;
  26
  27   FD_ZERO(&infd);
  28   FD_ZERO(&outfd);
  29   FD_ZERO(&errfd);
  30
  31   FD_SET(sockfd, &errfd); /* always check for error */
  32
  33   if(for_recv)
  34   {
  35     FD_SET(sockfd, &infd);
  36   }
  37   else
  38   {
  39     FD_SET(sockfd, &outfd);
  40   }
  41
  42   /* select() returns the number of signalled sockets or -1 */
  43   res = select(sockfd + 1, &infd, &outfd, &errfd, &tv);
  44   return res;
  45 }
  46
  47 int main(void)
  48 {
  49   CURL *curl;
  50   CURLcode res;
  51   /* Minimalistic http request */
  52   const char *request = "GET / HTTP/1.0\r\nHost: curl.haxx.se\r\n\r\n";
  53   int sockfd; /* socket */
  54   size_t iolen;
  55
  56   curl = curl_easy_init();
  57   if(curl) {
  58     curl_easy_setopt(curl, CURLOPT_URL, "curl.haxx.se");
  59     /* Do not do the transfer - only connect to host */
  60     curl_easy_setopt(curl, CURLOPT_CONNECT_ONLY, 1L);
  61     res = curl_easy_perform(curl);
  62
  63     if(CURLE_OK != res)
  64     {
  65       printf("Error: %s\n", strerror(res));
  66       return 1;
  67     }
  68
  69     /* Extract the socket from the curl handle - we'll need it
  70      * for waiting */
  71     res = curl_easy_getinfo(curl, CURLINFO_LASTSOCKET, &sockfd);
  72
  73     if(CURLE_OK != res)
  74     {
  75       printf("Error: %s\n", strerror(res));
  76       return 1;
  77     }
  78
  79     /* wait for the socket to become ready for sending */
  80     if(!wait_on_socket(sockfd, 0, 60000L))
  81     {
  82       printf("Error: timeout.\n");
  83       return 1;
  84     }
  85
  86     puts("Sending request.");
  87     /* Send the request. Real applications should check the iolen
  88      * to see if all the request has been sent */
  89     res = curl_easy_send(curl, request, strlen(request), &iolen);
  90
  91     if(CURLE_OK != res)
  92     {
  93       printf("Error: %s\n", strerror(res));
  94       return 1;
  95     }
  96     puts("Reading response.");
  97
  98     /* read the response */
  99     for(;;)
 100     {
 101       char buf[1024];
 102
 103       wait_on_socket(sockfd, 1, 60000L);
 104       res = curl_easy_recv(curl, buf, 1024, &iolen);
 105
 106       if(CURLE_OK != res)
 107         break;
 108
 109       printf("Received %u bytes.\n", iolen);
 110     }
 111
 112     /* always cleanup */
 113     curl_easy_cleanup(curl);
 114   }
 115   return 0;
 116 }