1 /*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2016, 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 https://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 /* <DESC> 23 * A basic application source code using the multi interface doing two 24 * transfers in parallel. 25 * </DESC> 26 */ 27 28 #include <stdio.h> 29 #include <string.h> 30 31 /* somewhat unix-specific */ 32 #include <sys/time.h> 33 #include <unistd.h> 34 35 /* curl stuff */ 36 #include <curl/curl.h> 37 38 /* 39 * Download a HTTP file and upload an FTP file simultaneously. 40 */ 41 42 #define HANDLECOUNT 2 /* Number of simultaneous transfers */ 43 #define HTTP_HANDLE 0 /* Index for the HTTP transfer */ 44 #define FTP_HANDLE 1 /* Index for the FTP transfer */ 45 46 int main(void) 47 { 48 CURL *handles[HANDLECOUNT]; 49 CURLM *multi_handle; 50 51 int still_running; /* keep number of running handles */ 52 int i; 53 54 CURLMsg *msg; /* for picking up messages with the transfer status */ 55 int msgs_left; /* how many messages are left */ 56 57 /* Allocate one CURL handle per transfer */ 58 for(i=0; i<HANDLECOUNT; i++) 59 handles[i] = curl_easy_init(); 60 61 /* set the options (I left out a few, you'll get the point anyway) */ 62 curl_easy_setopt(handles[HTTP_HANDLE], CURLOPT_URL, "http://example.com"); 63 64 curl_easy_setopt(handles[FTP_HANDLE], CURLOPT_URL, "ftp://example.com"); 65 curl_easy_setopt(handles[FTP_HANDLE], CURLOPT_UPLOAD, 1L); 66 67 /* init a multi stack */ 68 multi_handle = curl_multi_init(); 69 70 /* add the individual transfers */ 71 for(i=0; i<HANDLECOUNT; i++) 72 curl_multi_add_handle(multi_handle, handles[i]); 73 74 /* we start some action by calling perform right away */ 75 curl_multi_perform(multi_handle, &still_running); 76 77 do { 78 struct timeval timeout; 79 int rc; /* select() return code */ 80 CURLMcode mc; /* curl_multi_fdset() return code */ 81 82 fd_set fdread; 83 fd_set fdwrite; 84 fd_set fdexcep; 85 int maxfd = -1; 86 87 long curl_timeo = -1; 88 89 FD_ZERO(&fdread); 90 FD_ZERO(&fdwrite); 91 FD_ZERO(&fdexcep); 92 93 /* set a suitable timeout to play around with */ 94 timeout.tv_sec = 1; 95 timeout.tv_usec = 0; 96 97 curl_multi_timeout(multi_handle, &curl_timeo); 98 if(curl_timeo >= 0) { 99 timeout.tv_sec = curl_timeo / 1000; 100 if(timeout.tv_sec > 1) 101 timeout.tv_sec = 1; 102 else 103 timeout.tv_usec = (curl_timeo % 1000) * 1000; 104 } 105 106 /* get file descriptors from the transfers */ 107 mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd); 108 109 if(mc != CURLM_OK) { 110 fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc); 111 break; 112 } 113 114 /* On success the value of maxfd is guaranteed to be >= -1. We call 115 select(maxfd + 1, ...); specially in case of (maxfd == -1) there are 116 no fds ready yet so we call select(0, ...) --or Sleep() on Windows-- 117 to sleep 100ms, which is the minimum suggested value in the 118 curl_multi_fdset() doc. */ 119 120 if(maxfd == -1) { 121 #ifdef _WIN32 122 Sleep(100); 123 rc = 0; 124 #else 125 /* Portable sleep for platforms other than Windows. */ 126 struct timeval wait = { 0, 100 * 1000 }; /* 100ms */ 127 rc = select(0, NULL, NULL, NULL, &wait); 128 #endif 129 } 130 else { 131 /* Note that on some platforms 'timeout' may be modified by select(). 132 If you need access to the original value save a copy beforehand. */ 133 rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout); 134 } 135 136 switch(rc) { 137 case -1: 138 /* select error */ 139 break; 140 case 0: /* timeout */ 141 default: /* action */ 142 curl_multi_perform(multi_handle, &still_running); 143 break; 144 } 145 } while(still_running); 146 147 /* See how the transfers went */ 148 while((msg = curl_multi_info_read(multi_handle, &msgs_left))) { 149 if(msg->msg == CURLMSG_DONE) { 150 int idx, found = 0; 151 152 /* Find out which handle this message is about */ 153 for(idx=0; idx<HANDLECOUNT; idx++) { 154 found = (msg->easy_handle == handles[idx]); 155 if(found) 156 break; 157 } 158 159 switch (idx) { 160 case HTTP_HANDLE: 161 printf("HTTP transfer completed with status %d\n", msg->data.result); 162 break; 163 case FTP_HANDLE: 164 printf("FTP transfer completed with status %d\n", msg->data.result); 165 break; 166 } 167 } 168 } 169 170 curl_multi_cleanup(multi_handle); 171 172 /* Free the CURL handles */ 173 for(i=0; i<HANDLECOUNT; i++) 174 curl_easy_cleanup(handles[i]); 175 176 return 0; 177 } 178
