1/*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2014, 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#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 34static 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 45static 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 51int 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 92 long curl_timeo = -1; 93 94 /* Initialise the file descriptors */ 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(mcurl, &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 curl_multi_fdset(mcurl, &fdread, &fdwrite, &fdexcep, &maxfd); 114 115 /* In a real-world program you OF COURSE check the return code of the 116 function calls. On success, the value of maxfd is guaranteed to be 117 greater or equal than -1. We call select(maxfd + 1, ...), specially in 118 case of (maxfd == -1), we call select(0, ...), which is basically equal 119 to sleep. */ 120 rc = select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout); 121 122 if(tvdiff(tvnow(), mp_start) > MULTI_PERFORM_HANG_TIMEOUT) { 123 fprintf(stderr, 124 "ABORTING: Since it seems that we would have run forever.\n"); 125 break; 126 } 127 128 switch(rc) { 129 case -1: /* select error */ 130 break; 131 case 0: /* timeout */ 132 default: /* action */ 133 curl_multi_perform(mcurl, &still_running); 134 break; 135 } 136 } 137 138 /* Always cleanup */ 139 curl_multi_remove_handle(mcurl, curl); 140 curl_multi_cleanup(mcurl); 141 curl_easy_cleanup(curl); 142 curl_global_cleanup(); 143 144 return 0; 145} 146