1 /*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2014, 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 #include <stdio.h> 23 #include <curl/curl.h> 24 25 /* This is a simple example showing how to fetch mail using libcurl's IMAP 26 * capabilities. It builds on the imap-fetch.c example to demonstrate how to 27 * use libcurl's multi interface. 28 * 29 * Note that this example requires libcurl 7.30.0 or above. 30 */ 31 32 #define MULTI_PERFORM_HANG_TIMEOUT 60 * 1000 33 34 static struct timeval tvnow(void) 35 { 36 struct timeval now; 37 38 /* time() returns the value of time in seconds since the epoch */ 39 now.tv_sec = (long)time(NULL); 40 now.tv_usec = 0; 41 42 return now; 43 } 44 45 static long tvdiff(struct timeval newer, struct timeval older) 46 { 47 return (newer.tv_sec - older.tv_sec) * 1000 + 48 (newer.tv_usec - older.tv_usec) / 1000; 49 } 50 51 int main(void) 52 { 53 CURL *curl; 54 CURLM *mcurl; 55 int still_running = 1; 56 struct timeval mp_start; 57 58 curl_global_init(CURL_GLOBAL_DEFAULT); 59 60 curl = curl_easy_init(); 61 if(!curl) 62 return 1; 63 64 mcurl = curl_multi_init(); 65 if(!mcurl) 66 return 2; 67 68 /* Set username and password */ 69 curl_easy_setopt(curl, CURLOPT_USERNAME, "user"); 70 curl_easy_setopt(curl, CURLOPT_PASSWORD, "secret"); 71 72 /* This will fetch message 1 from the user's inbox */ 73 curl_easy_setopt(curl, CURLOPT_URL, "imap://imap.example.com/INBOX/;UID=1"); 74 75 /* Tell the multi stack about our easy handle */ 76 curl_multi_add_handle(mcurl, curl); 77 78 /* Record the start time which we can use later */ 79 mp_start = tvnow(); 80 81 /* We start some action by calling perform right away */ 82 curl_multi_perform(mcurl, &still_running); 83 84 while(still_running) { 85 struct timeval timeout; 86 fd_set fdread; 87 fd_set fdwrite; 88 fd_set fdexcep; 89 int maxfd = -1; 90 int rc; 91 CURLMcode mc; /* curl_multi_fdset() return code */ 92 93 long curl_timeo = -1; 94 95 /* Initialise the file descriptors */ 96 FD_ZERO(&fdread); 97 FD_ZERO(&fdwrite); 98 FD_ZERO(&fdexcep); 99 100 /* Set a suitable timeout to play around with */ 101 timeout.tv_sec = 1; 102 timeout.tv_usec = 0; 103 104 curl_multi_timeout(mcurl, &curl_timeo); 105 if(curl_timeo >= 0) { 106 timeout.tv_sec = curl_timeo / 1000; 107 if(timeout.tv_sec > 1) 108 timeout.tv_sec = 1; 109 else 110 timeout.tv_usec = (curl_timeo % 1000) * 1000; 111 } 112 113 /* get file descriptors from the transfers */ 114 mc = curl_multi_fdset(mcurl, &fdread, &fdwrite, &fdexcep, &maxfd); 115 116 if(mc != CURLM_OK) 117 { 118 fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc); 119 break; 120 } 121 122 /* On success the value of maxfd is guaranteed to be >= -1. We call 123 select(maxfd + 1, ...); specially in case of (maxfd == -1) there are 124 no fds ready yet so we call select(0, ...) --or Sleep() on Windows-- 125 to sleep 100ms, which is the minimum suggested value in the 126 curl_multi_fdset() doc. */ 127 128 if(maxfd == -1) { 129 #ifdef _WIN32 130 Sleep(100); 131 rc = 0; 132 #else 133 /* Portable sleep for platforms other than Windows. */ 134 struct timeval wait = { 0, 100 * 1000 }; /* 100ms */ 135 rc = select(0, NULL, NULL, NULL, &wait); 136 #endif 137 } 138 else { 139 /* Note that on some platforms 'timeout' may be modified by select(). 140 If you need access to the original value save a copy beforehand. */ 141 rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout); 142 } 143 144 if(tvdiff(tvnow(), mp_start) > MULTI_PERFORM_HANG_TIMEOUT) { 145 fprintf(stderr, 146 "ABORTING: Since it seems that we would have run forever.\n"); 147 break; 148 } 149 150 switch(rc) { 151 case -1: /* select error */ 152 break; 153 case 0: /* timeout */ 154 default: /* action */ 155 curl_multi_perform(mcurl, &still_running); 156 break; 157 } 158 } 159 160 /* Always cleanup */ 161 curl_multi_remove_handle(mcurl, curl); 162 curl_multi_cleanup(mcurl); 163 curl_easy_cleanup(curl); 164 curl_global_cleanup(); 165 166 return 0; 167 } 168
