CMakeLua/Utilities/cmcurl-7.19.0/docs/examples/multi-app.c

   1 /*****************************************************************************
   2  *                                  _   _ ____  _
   3  *  Project                     ___| | | |  _ \| |
   4  *                             / __| | | | |_) | |
   5  *                            | (__| |_| |  _ <| |___
   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  * $Id: multi-app.c,v 1.1.1.1 2008-09-23 16:32:05 hoffman Exp $
   9  *
  10  * This is an example application source code using the multi interface.
  11  */
  12
  13 #include <stdio.h>
  14 #include <string.h>
  15
  16 /* somewhat unix-specific */
  17 #include <sys/time.h>
  18 #include <unistd.h>
  19
  20 /* curl stuff */
  21 #include <curl/curl.h>
  22
  23 /*
  24  * Download a HTTP file and upload an FTP file simultaneously.
  25  */
  26
  27 #define HANDLECOUNT 2   /* Number of simultaneous transfers */
  28 #define HTTP_HANDLE 0   /* Index for the HTTP transfer */
  29 #define FTP_HANDLE 1    /* Index for the FTP transfer */
  30
  31 int main(int argc, char **argv)
  32 {
  33   CURL *handles[HANDLECOUNT];
  34   CURLM *multi_handle;
  35
  36   int still_running; /* keep number of running handles */
  37   int i;
  38
  39   CURLMsg *msg; /* for picking up messages with the transfer status */
  40   int msgs_left; /* how many messages are left */
  41
  42   /* Allocate one CURL handle per transfer */
  43   for (i=0; i<HANDLECOUNT; i++)
  44       handles[i] = curl_easy_init();
  45
  46   /* set the options (I left out a few, you'll get the point anyway) */
  47   curl_easy_setopt(handles[HTTP_HANDLE], CURLOPT_URL, "http://website.com");
  48
  49   curl_easy_setopt(handles[FTP_HANDLE], CURLOPT_URL, "ftp://ftpsite.com");
  50   curl_easy_setopt(handles[FTP_HANDLE], CURLOPT_UPLOAD, 1L);
  51
  52   /* init a multi stack */
  53   multi_handle = curl_multi_init();
  54
  55   /* add the individual transfers */
  56   for (i=0; i<HANDLECOUNT; i++)
  57       curl_multi_add_handle(multi_handle, handles[i]);
  58
  59   /* we start some action by calling perform right away */
  60   while(CURLM_CALL_MULTI_PERFORM ==
  61         curl_multi_perform(multi_handle, &still_running));
  62
  63   while(still_running) {
  64     struct timeval timeout;
  65     int rc; /* select() return code */
  66
  67     fd_set fdread;
  68     fd_set fdwrite;
  69     fd_set fdexcep;
  70     int maxfd;
  71
  72     FD_ZERO(&fdread);
  73     FD_ZERO(&fdwrite);
  74     FD_ZERO(&fdexcep);
  75
  76     /* set a suitable timeout to play around with */
  77     timeout.tv_sec = 1;
  78     timeout.tv_usec = 0;
  79
  80     /* get file descriptors from the transfers */
  81     curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
  82
  83     /* In a real-world program you OF COURSE check the return code of the
  84        function calls, *and* you make sure that maxfd is bigger than -1 so
  85        that the call to select() below makes sense! */
  86
  87     rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
  88
  89     switch(rc) {
  90     case -1:
  91       /* select error */
  92       break;
  93     case 0:
  94       /* timeout, do something else */
  95       break;
  96     default:
  97       /* one or more of curl's file descriptors say there's data to read
  98          or write */
  99       while(CURLM_CALL_MULTI_PERFORM ==
 100             curl_multi_perform(multi_handle, &still_running));
 101       break;
 102     }
 103   }
 104
 105   /* See how the transfers went */
 106   while ((msg = curl_multi_info_read(multi_handle, &msgs_left))) {
 107     if (msg->msg == CURLMSG_DONE) {
 108
 109        int idx, found = 0;
 110
 111        /* Find out which handle this message is about */
 112        for (idx=0; (!found && (idx<HANDLECOUNT)); idx++) found = (msg->easy_handle == handles[idx]);
 113
 114        switch (idx) {
 115          case HTTP_HANDLE:
 116            printf("HTTP transfer completed with status %d\n", msg->data.result);
 117            break;
 118          case FTP_HANDLE:
 119            printf("FTP transfer completed with status %d\n", msg->data.result);
 120            break;
 121        }
 122     }
 123   }
 124
 125   curl_multi_cleanup(multi_handle);
 126
 127   /* Free the CURL handles */
 128   for (i=0; i<HANDLECOUNT; i++)
 129       curl_easy_cleanup(handles[i]);
 130
 131   return 0;
 132 }