1 /*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel (at) 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 42 int 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 CURLMcode mc; /* curl_multi_fdset() return code */ 77 78 fd_set fdread; 79 fd_set fdwrite; 80 fd_set fdexcep; 81 int maxfd = -1; 82 83 long curl_timeo = -1; 84 85 FD_ZERO(&fdread); 86 FD_ZERO(&fdwrite); 87 FD_ZERO(&fdexcep); 88 89 /* set a suitable timeout to play around with */ 90 timeout.tv_sec = 1; 91 timeout.tv_usec = 0; 92 93 curl_multi_timeout(multi_handle, &curl_timeo); 94 if(curl_timeo >= 0) { 95 timeout.tv_sec = curl_timeo / 1000; 96 if(timeout.tv_sec > 1) 97 timeout.tv_sec = 1; 98 else 99 timeout.tv_usec = (curl_timeo % 1000) * 1000; 100 } 101 102 /* get file descriptors from the transfers */ 103 mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd); 104 105 if(mc != CURLM_OK) 106 { 107 fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc); 108 break; 109 } 110 111 /* On success the value of maxfd is guaranteed to be >= -1. We call 112 select(maxfd + 1, ...); specially in case of (maxfd == -1) there are 113 no fds ready yet so we call select(0, ...) --or Sleep() on Windows-- 114 to sleep 100ms, which is the minimum suggested value in the 115 curl_multi_fdset() doc. */ 116 117 if(maxfd == -1) { 118 #ifdef _WIN32 119 Sleep(100); 120 rc = 0; 121 #else 122 /* Portable sleep for platforms other than Windows. */ 123 struct timeval wait = { 0, 100 * 1000 }; /* 100ms */ 124 rc = select(0, NULL, NULL, NULL, &wait); 125 #endif 126 } 127 else { 128 /* Note that on some platforms 'timeout' may be modified by select(). 129 If you need access to the original value save a copy beforehand. */ 130 rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout); 131 } 132 133 switch(rc) { 134 case -1: 135 /* select error */ 136 break; 137 case 0: /* timeout */ 138 default: /* action */ 139 curl_multi_perform(multi_handle, &still_running); 140 break; 141 } 142 } while(still_running); 143 144 /* See how the transfers went */ 145 while ((msg = curl_multi_info_read(multi_handle, &msgs_left))) { 146 if (msg->msg == CURLMSG_DONE) { 147 int idx, found = 0; 148 149 /* Find out which handle this message is about */ 150 for (idx=0; idx<HANDLECOUNT; idx++) { 151 found = (msg->easy_handle == handles[idx]); 152 if(found) 153 break; 154 } 155 156 switch (idx) { 157 case HTTP_HANDLE: 158 printf("HTTP transfer completed with status %d\n", msg->data.result); 159 break; 160 case FTP_HANDLE: 161 printf("FTP transfer completed with status %d\n", msg->data.result); 162 break; 163 } 164 } 165 } 166 167 curl_multi_cleanup(multi_handle); 168 169 /* Free the CURL handles */ 170 for (i=0; i<HANDLECOUNT; i++) 171 curl_easy_cleanup(handles[i]); 172 173 return 0; 174 } 175
