1/*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al. 9 * 10 * This software is licensed as described in the file COPYING, which 11 * you should have received as part of this distribution. The terms 12 * are also available at http://curl.haxx.se/docs/copyright.html. 13 * 14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell 15 * copies of the Software, and permit persons to whom the Software is 16 * furnished to do so, under the terms of the COPYING file. 17 * 18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY 19 * KIND, either express or implied. 20 * 21 ***************************************************************************/ 22/* This is an example application source code using the multi interface. */ 23 24#include <stdio.h> 25#include <string.h> 26 27/* somewhat unix-specific */ 28#include <sys/time.h> 29#include <unistd.h> 30 31/* curl stuff */ 32#include <curl/curl.h> 33 34/* 35 * Download a HTTP file and upload an FTP file simultaneously. 36 */ 37 38#define HANDLECOUNT 2 /* Number of simultaneous transfers */ 39#define HTTP_HANDLE 0 /* Index for the HTTP transfer */ 40#define FTP_HANDLE 1 /* Index for the FTP transfer */ 41 42int main(void) 43{ 44 CURL *handles[HANDLECOUNT]; 45 CURLM *multi_handle; 46 47 int still_running; /* keep number of running handles */ 48 int i; 49 50 CURLMsg *msg; /* for picking up messages with the transfer status */ 51 int msgs_left; /* how many messages are left */ 52 53 /* Allocate one CURL handle per transfer */ 54 for (i=0; i<HANDLECOUNT; i++) 55 handles[i] = curl_easy_init(); 56 57 /* set the options (I left out a few, you'll get the point anyway) */ 58 curl_easy_setopt(handles[HTTP_HANDLE], CURLOPT_URL, "http://example.com"); 59 60 curl_easy_setopt(handles[FTP_HANDLE], CURLOPT_URL, "ftp://example.com"); 61 curl_easy_setopt(handles[FTP_HANDLE], CURLOPT_UPLOAD, 1L); 62 63 /* init a multi stack */ 64 multi_handle = curl_multi_init(); 65 66 /* add the individual transfers */ 67 for (i=0; i<HANDLECOUNT; i++) 68 curl_multi_add_handle(multi_handle, handles[i]); 69 70 /* we start some action by calling perform right away */ 71 curl_multi_perform(multi_handle, &still_running); 72 73 do { 74 struct timeval timeout; 75 int rc; /* select() return code */ 76 77 fd_set fdread; 78 fd_set fdwrite; 79 fd_set fdexcep; 80 int maxfd = -1; 81 82 long curl_timeo = -1; 83 84 FD_ZERO(&fdread); 85 FD_ZERO(&fdwrite); 86 FD_ZERO(&fdexcep); 87 88 /* set a suitable timeout to play around with */ 89 timeout.tv_sec = 1; 90 timeout.tv_usec = 0; 91 92 curl_multi_timeout(multi_handle, &curl_timeo); 93 if(curl_timeo >= 0) { 94 timeout.tv_sec = curl_timeo / 1000; 95 if(timeout.tv_sec > 1) 96 timeout.tv_sec = 1; 97 else 98 timeout.tv_usec = (curl_timeo % 1000) * 1000; 99 } 100 101 /* get file descriptors from the transfers */ 102 curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd); 103 104 /* In a real-world program you OF COURSE check the return code of the 105 function calls. On success, the value of maxfd is guaranteed to be 106 greater or equal than -1. We call select(maxfd + 1, ...), specially in 107 case of (maxfd == -1), we call select(0, ...), which is basically equal 108 to sleep. */ 109 110 rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout); 111 112 switch(rc) { 113 case -1: 114 /* select error */ 115 break; 116 case 0: /* timeout */ 117 default: /* action */ 118 curl_multi_perform(multi_handle, &still_running); 119 break; 120 } 121 } while(still_running); 122 123 /* See how the transfers went */ 124 while ((msg = curl_multi_info_read(multi_handle, &msgs_left))) { 125 if (msg->msg == CURLMSG_DONE) { 126 int idx, found = 0; 127 128 /* Find out which handle this message is about */ 129 for (idx=0; idx<HANDLECOUNT; idx++) { 130 found = (msg->easy_handle == handles[idx]); 131 if(found) 132 break; 133 } 134 135 switch (idx) { 136 case HTTP_HANDLE: 137 printf("HTTP transfer completed with status %d\n", msg->data.result); 138 break; 139 case FTP_HANDLE: 140 printf("FTP transfer completed with status %d\n", msg->data.result); 141 break; 142 } 143 } 144 } 145 146 curl_multi_cleanup(multi_handle); 147 148 /* Free the CURL handles */ 149 for (i=0; i<HANDLECOUNT; i++) 150 curl_easy_cleanup(handles[i]); 151 152 return 0; 153} 154