1 /*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2017, 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 * using the multi interface to do a multipart formpost without blocking 24 * </DESC> 25 */ 26 27 #include <stdio.h> 28 #include <string.h> 29 #include <sys/time.h> 30 31 #include <curl/curl.h> 32 33 int main(void) 34 { 35 CURL *curl; 36 37 CURLM *multi_handle; 38 int still_running; 39 40 struct curl_httppost *formpost = NULL; 41 struct curl_httppost *lastptr = NULL; 42 struct curl_slist *headerlist = NULL; 43 static const char buf[] = "Expect:"; 44 45 /* Fill in the file upload field. This makes libcurl load data from 46 the given file name when curl_easy_perform() is called. */ 47 curl_formadd(&formpost, 48 &lastptr, 49 CURLFORM_COPYNAME, "sendfile", 50 CURLFORM_FILE, "postit2.c", 51 CURLFORM_END); 52 53 /* Fill in the filename field */ 54 curl_formadd(&formpost, 55 &lastptr, 56 CURLFORM_COPYNAME, "filename", 57 CURLFORM_COPYCONTENTS, "postit2.c", 58 CURLFORM_END); 59 60 /* Fill in the submit field too, even if this is rarely needed */ 61 curl_formadd(&formpost, 62 &lastptr, 63 CURLFORM_COPYNAME, "submit", 64 CURLFORM_COPYCONTENTS, "send", 65 CURLFORM_END); 66 67 curl = curl_easy_init(); 68 multi_handle = curl_multi_init(); 69 70 /* initialize custom header list (stating that Expect: 100-continue is not 71 wanted */ 72 headerlist = curl_slist_append(headerlist, buf); 73 if(curl && multi_handle) { 74 75 /* what URL that receives this POST */ 76 curl_easy_setopt(curl, CURLOPT_URL, "http://www.example.com/upload.cgi"); 77 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L); 78 79 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist); 80 curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost); 81 82 curl_multi_add_handle(multi_handle, curl); 83 84 curl_multi_perform(multi_handle, &still_running); 85 86 do { 87 struct timeval timeout; 88 int rc; /* select() return code */ 89 CURLMcode mc; /* curl_multi_fdset() return code */ 90 91 fd_set fdread; 92 fd_set fdwrite; 93 fd_set fdexcep; 94 int maxfd = -1; 95 96 long curl_timeo = -1; 97 98 FD_ZERO(&fdread); 99 FD_ZERO(&fdwrite); 100 FD_ZERO(&fdexcep); 101 102 /* set a suitable timeout to play around with */ 103 timeout.tv_sec = 1; 104 timeout.tv_usec = 0; 105 106 curl_multi_timeout(multi_handle, &curl_timeo); 107 if(curl_timeo >= 0) { 108 timeout.tv_sec = curl_timeo / 1000; 109 if(timeout.tv_sec > 1) 110 timeout.tv_sec = 1; 111 else 112 timeout.tv_usec = (curl_timeo % 1000) * 1000; 113 } 114 115 /* get file descriptors from the transfers */ 116 mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd); 117 118 if(mc != CURLM_OK) { 119 fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc); 120 break; 121 } 122 123 /* On success the value of maxfd is guaranteed to be >= -1. We call 124 select(maxfd + 1, ...); specially in case of (maxfd == -1) there are 125 no fds ready yet so we call select(0, ...) --or Sleep() on Windows-- 126 to sleep 100ms, which is the minimum suggested value in the 127 curl_multi_fdset() doc. */ 128 129 if(maxfd == -1) { 130 #ifdef _WIN32 131 Sleep(100); 132 rc = 0; 133 #else 134 /* Portable sleep for platforms other than Windows. */ 135 struct timeval wait = { 0, 100 * 1000 }; /* 100ms */ 136 rc = select(0, NULL, NULL, NULL, &wait); 137 #endif 138 } 139 else { 140 /* Note that on some platforms 'timeout' may be modified by select(). 141 If you need access to the original value save a copy beforehand. */ 142 rc = select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout); 143 } 144 145 switch(rc) { 146 case -1: 147 /* select error */ 148 break; 149 case 0: 150 default: 151 /* timeout or readable/writable sockets */ 152 printf("perform!\n"); 153 curl_multi_perform(multi_handle, &still_running); 154 printf("running: %d!\n", still_running); 155 break; 156 } 157 } while(still_running); 158 159 curl_multi_cleanup(multi_handle); 160 161 /* always cleanup */ 162 curl_easy_cleanup(curl); 163 164 /* then cleanup the formpost chain */ 165 curl_formfree(formpost); 166 167 /* free slist */ 168 curl_slist_free_all(headerlist); 169 } 170 return 0; 171 } 172
