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 * to do a multipart formpost without "blocking". */ 24 #include <stdio.h> 25 #include <string.h> 26 #include <sys/time.h> 27 28 #include <curl/curl.h> 29 30 int main(void) 31 { 32 CURL *curl; 33 34 CURLM *multi_handle; 35 int still_running; 36 37 struct curl_httppost *formpost=NULL; 38 struct curl_httppost *lastptr=NULL; 39 struct curl_slist *headerlist=NULL; 40 static const char buf[] = "Expect:"; 41 42 /* Fill in the file upload field. This makes libcurl load data from 43 the given file name when curl_easy_perform() is called. */ 44 curl_formadd(&formpost, 45 &lastptr, 46 CURLFORM_COPYNAME, "sendfile", 47 CURLFORM_FILE, "postit2.c", 48 CURLFORM_END); 49 50 /* Fill in the filename field */ 51 curl_formadd(&formpost, 52 &lastptr, 53 CURLFORM_COPYNAME, "filename", 54 CURLFORM_COPYCONTENTS, "postit2.c", 55 CURLFORM_END); 56 57 /* Fill in the submit field too, even if this is rarely needed */ 58 curl_formadd(&formpost, 59 &lastptr, 60 CURLFORM_COPYNAME, "submit", 61 CURLFORM_COPYCONTENTS, "send", 62 CURLFORM_END); 63 64 curl = curl_easy_init(); 65 multi_handle = curl_multi_init(); 66 67 /* initialize custom header list (stating that Expect: 100-continue is not 68 wanted */ 69 headerlist = curl_slist_append(headerlist, buf); 70 if(curl && multi_handle) { 71 72 /* what URL that receives this POST */ 73 curl_easy_setopt(curl, CURLOPT_URL, "http://www.example.com/upload.cgi"); 74 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L); 75 76 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist); 77 curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost); 78 79 curl_multi_add_handle(multi_handle, curl); 80 81 curl_multi_perform(multi_handle, &still_running); 82 83 do { 84 struct timeval timeout; 85 int rc; /* select() return code */ 86 CURLMcode mc; /* curl_multi_fdset() return code */ 87 88 fd_set fdread; 89 fd_set fdwrite; 90 fd_set fdexcep; 91 int maxfd = -1; 92 93 long curl_timeo = -1; 94 95 FD_ZERO(&fdread); 96 FD_ZERO(&fdwrite); 97 FD_ZERO(&fdexcep); 98 99 /* set a suitable timeout to play around with */ 100 timeout.tv_sec = 1; 101 timeout.tv_usec = 0; 102 103 curl_multi_timeout(multi_handle, &curl_timeo); 104 if(curl_timeo >= 0) { 105 timeout.tv_sec = curl_timeo / 1000; 106 if(timeout.tv_sec > 1) 107 timeout.tv_sec = 1; 108 else 109 timeout.tv_usec = (curl_timeo % 1000) * 1000; 110 } 111 112 /* get file descriptors from the transfers */ 113 mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd); 114 115 if(mc != CURLM_OK) 116 { 117 fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc); 118 break; 119 } 120 121 /* On success the value of maxfd is guaranteed to be >= -1. We call 122 select(maxfd + 1, ...); specially in case of (maxfd == -1) there are 123 no fds ready yet so we call select(0, ...) --or Sleep() on Windows-- 124 to sleep 100ms, which is the minimum suggested value in the 125 curl_multi_fdset() doc. */ 126 127 if(maxfd == -1) { 128 #ifdef _WIN32 129 Sleep(100); 130 rc = 0; 131 #else 132 /* Portable sleep for platforms other than Windows. */ 133 struct timeval wait = { 0, 100 * 1000 }; /* 100ms */ 134 rc = select(0, NULL, NULL, NULL, &wait); 135 #endif 136 } 137 else { 138 /* Note that on some platforms 'timeout' may be modified by select(). 139 If you need access to the original value save a copy beforehand. */ 140 rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout); 141 } 142 143 switch(rc) { 144 case -1: 145 /* select error */ 146 break; 147 case 0: 148 default: 149 /* timeout or readable/writable sockets */ 150 printf("perform!\n"); 151 curl_multi_perform(multi_handle, &still_running); 152 printf("running: %d!\n", still_running); 153 break; 154 } 155 } while(still_running); 156 157 curl_multi_cleanup(multi_handle); 158 159 /* always cleanup */ 160 curl_easy_cleanup(curl); 161 162 /* then cleanup the formpost chain */ 163 curl_formfree(formpost); 164 165 /* free slist */ 166 curl_slist_free_all (headerlist); 167 } 168 return 0; 169 } 170
