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 * 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 30int 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 /* initalize 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 87 fd_set fdread; 88 fd_set fdwrite; 89 fd_set fdexcep; 90 int maxfd = -1; 91 92 long curl_timeo = -1; 93 94 FD_ZERO(&fdread); 95 FD_ZERO(&fdwrite); 96 FD_ZERO(&fdexcep); 97 98 /* set a suitable timeout to play around with */ 99 timeout.tv_sec = 1; 100 timeout.tv_usec = 0; 101 102 curl_multi_timeout(multi_handle, &curl_timeo); 103 if(curl_timeo >= 0) { 104 timeout.tv_sec = curl_timeo / 1000; 105 if(timeout.tv_sec > 1) 106 timeout.tv_sec = 1; 107 else 108 timeout.tv_usec = (curl_timeo % 1000) * 1000; 109 } 110 111 /* get file descriptors from the transfers */ 112 curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd); 113 114 /* In a real-world program you OF COURSE check the return code of the 115 function calls. On success, the value of maxfd is guaranteed to be 116 greater or equal than -1. We call select(maxfd + 1, ...), specially in 117 case of (maxfd == -1), we call select(0, ...), which is basically equal 118 to sleep. */ 119 120 rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout); 121 122 switch(rc) { 123 case -1: 124 /* select error */ 125 break; 126 case 0: 127 default: 128 /* timeout or readable/writable sockets */ 129 printf("perform!\n"); 130 curl_multi_perform(multi_handle, &still_running); 131 printf("running: %d!\n", still_running); 132 break; 133 } 134 } while(still_running); 135 136 curl_multi_cleanup(multi_handle); 137 138 /* always cleanup */ 139 curl_easy_cleanup(curl); 140 141 /* then cleanup the formpost chain */ 142 curl_formfree(formpost); 143 144 /* free slist */ 145 curl_slist_free_all (headerlist); 146 } 147 return 0; 148} 149