146 lines
4.1 KiB
C
146 lines
4.1 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at http://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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#include <stdio.h>
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#include <curl/curl.h>
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/* This is a simple example showing how to fetch mail using libcurl's IMAP
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* capabilities. It builds on the imap-fetch.c example to demonstrate how to
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* use libcurl's multi interface.
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*
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* Note that this example requires libcurl 7.30.0 or above.
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*/
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#define MULTI_PERFORM_HANG_TIMEOUT 60 * 1000
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static struct timeval tvnow(void)
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{
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struct timeval now;
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/* time() returns the value of time in seconds since the epoch */
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now.tv_sec = (long)time(NULL);
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now.tv_usec = 0;
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return now;
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}
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static long tvdiff(struct timeval newer, struct timeval older)
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{
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return (newer.tv_sec - older.tv_sec) * 1000 +
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(newer.tv_usec - older.tv_usec) / 1000;
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}
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int main(void)
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{
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CURL *curl;
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CURLM *mcurl;
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int still_running = 1;
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struct timeval mp_start;
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curl_global_init(CURL_GLOBAL_DEFAULT);
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curl = curl_easy_init();
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if(!curl)
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return 1;
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mcurl = curl_multi_init();
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if(!mcurl)
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return 2;
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/* Set username and password */
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curl_easy_setopt(curl, CURLOPT_USERNAME, "user");
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curl_easy_setopt(curl, CURLOPT_PASSWORD, "secret");
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/* This will fetch message 1 from the user's inbox */
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curl_easy_setopt(curl, CURLOPT_URL, "imap://imap.example.com/INBOX/;UID=1");
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/* Tell the multi stack about our easy handle */
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curl_multi_add_handle(mcurl, curl);
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/* Record the start time which we can use later */
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mp_start = tvnow();
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/* We start some action by calling perform right away */
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curl_multi_perform(mcurl, &still_running);
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while(still_running) {
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struct timeval timeout;
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fd_set fdread;
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fd_set fdwrite;
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fd_set fdexcep;
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int maxfd = -1;
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int rc;
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long curl_timeo = -1;
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/* Initialise the file descriptors */
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FD_ZERO(&fdread);
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FD_ZERO(&fdwrite);
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FD_ZERO(&fdexcep);
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/* Set a suitable timeout to play around with */
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timeout.tv_sec = 1;
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timeout.tv_usec = 0;
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curl_multi_timeout(mcurl, &curl_timeo);
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if(curl_timeo >= 0) {
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timeout.tv_sec = curl_timeo / 1000;
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if(timeout.tv_sec > 1)
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timeout.tv_sec = 1;
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else
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timeout.tv_usec = (curl_timeo % 1000) * 1000;
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}
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/* Get file descriptors from the transfers */
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curl_multi_fdset(mcurl, &fdread, &fdwrite, &fdexcep, &maxfd);
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/* In a real-world program you OF COURSE check the return code of the
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function calls. On success, the value of maxfd is guaranteed to be
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greater or equal than -1. We call select(maxfd + 1, ...), specially in
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case of (maxfd == -1), we call select(0, ...), which is basically equal
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to sleep. */
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rc = select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout);
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if(tvdiff(tvnow(), mp_start) > MULTI_PERFORM_HANG_TIMEOUT) {
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fprintf(stderr,
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"ABORTING: Since it seems that we would have run forever.\n");
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break;
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}
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switch(rc) {
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case -1: /* select error */
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break;
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case 0: /* timeout */
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default: /* action */
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curl_multi_perform(mcurl, &still_running);
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break;
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}
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}
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/* Always cleanup */
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curl_multi_remove_handle(mcurl, curl);
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curl_multi_cleanup(mcurl);
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curl_easy_cleanup(curl);
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curl_global_cleanup();
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return 0;
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}
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