Annotation of embedaddon/curl/docs/examples/pop3-multi.c, revision 1.1
1.1 ! misho 1: /***************************************************************************
! 2: * _ _ ____ _
! 3: * Project ___| | | | _ \| |
! 4: * / __| | | | |_) | |
! 5: * | (__| |_| | _ <| |___
! 6: * \___|\___/|_| \_\_____|
! 7: *
! 8: * Copyright (C) 1998 - 2017, 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 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:
! 23: /* <DESC>
! 24: * POP3 example using the multi interface
! 25: * </DESC>
! 26: */
! 27:
! 28: #include <stdio.h>
! 29: #include <string.h>
! 30: #include <curl/curl.h>
! 31:
! 32: /* This is a simple example showing how to retrieve mail using libcurl's POP3
! 33: * capabilities. It builds on the pop3-retr.c example to demonstrate how to use
! 34: * libcurl's multi interface.
! 35: *
! 36: * Note that this example requires libcurl 7.20.0 or above.
! 37: */
! 38:
! 39: #define MULTI_PERFORM_HANG_TIMEOUT 60 * 1000
! 40:
! 41: static struct timeval tvnow(void)
! 42: {
! 43: struct timeval now;
! 44:
! 45: /* time() returns the value of time in seconds since the epoch */
! 46: now.tv_sec = (long)time(NULL);
! 47: now.tv_usec = 0;
! 48:
! 49: return now;
! 50: }
! 51:
! 52: static long tvdiff(struct timeval newer, struct timeval older)
! 53: {
! 54: return (newer.tv_sec - older.tv_sec) * 1000 +
! 55: (newer.tv_usec - older.tv_usec) / 1000;
! 56: }
! 57:
! 58: int main(void)
! 59: {
! 60: CURL *curl;
! 61: CURLM *mcurl;
! 62: int still_running = 1;
! 63: struct timeval mp_start;
! 64:
! 65: curl_global_init(CURL_GLOBAL_DEFAULT);
! 66:
! 67: curl = curl_easy_init();
! 68: if(!curl)
! 69: return 1;
! 70:
! 71: mcurl = curl_multi_init();
! 72: if(!mcurl)
! 73: return 2;
! 74:
! 75: /* Set username and password */
! 76: curl_easy_setopt(curl, CURLOPT_USERNAME, "user");
! 77: curl_easy_setopt(curl, CURLOPT_PASSWORD, "secret");
! 78:
! 79: /* This will retrieve message 1 from the user's mailbox */
! 80: curl_easy_setopt(curl, CURLOPT_URL, "pop3://pop.example.com/1");
! 81:
! 82: /* Tell the multi stack about our easy handle */
! 83: curl_multi_add_handle(mcurl, curl);
! 84:
! 85: /* Record the start time which we can use later */
! 86: mp_start = tvnow();
! 87:
! 88: /* We start some action by calling perform right away */
! 89: curl_multi_perform(mcurl, &still_running);
! 90:
! 91: while(still_running) {
! 92: struct timeval timeout;
! 93: fd_set fdread;
! 94: fd_set fdwrite;
! 95: fd_set fdexcep;
! 96: int maxfd = -1;
! 97: int rc;
! 98: CURLMcode mc; /* curl_multi_fdset() return code */
! 99:
! 100: long curl_timeo = -1;
! 101:
! 102: /* Initialise the file descriptors */
! 103: FD_ZERO(&fdread);
! 104: FD_ZERO(&fdwrite);
! 105: FD_ZERO(&fdexcep);
! 106:
! 107: /* Set a suitable timeout to play around with */
! 108: timeout.tv_sec = 1;
! 109: timeout.tv_usec = 0;
! 110:
! 111: curl_multi_timeout(mcurl, &curl_timeo);
! 112: if(curl_timeo >= 0) {
! 113: timeout.tv_sec = curl_timeo / 1000;
! 114: if(timeout.tv_sec > 1)
! 115: timeout.tv_sec = 1;
! 116: else
! 117: timeout.tv_usec = (curl_timeo % 1000) * 1000;
! 118: }
! 119:
! 120: /* get file descriptors from the transfers */
! 121: mc = curl_multi_fdset(mcurl, &fdread, &fdwrite, &fdexcep, &maxfd);
! 122:
! 123: if(mc != CURLM_OK) {
! 124: fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
! 125: break;
! 126: }
! 127:
! 128: /* On success the value of maxfd is guaranteed to be >= -1. We call
! 129: select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
! 130: no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
! 131: to sleep 100ms, which is the minimum suggested value in the
! 132: curl_multi_fdset() doc. */
! 133:
! 134: if(maxfd == -1) {
! 135: #ifdef _WIN32
! 136: Sleep(100);
! 137: rc = 0;
! 138: #else
! 139: /* Portable sleep for platforms other than Windows. */
! 140: struct timeval wait = { 0, 100 * 1000 }; /* 100ms */
! 141: rc = select(0, NULL, NULL, NULL, &wait);
! 142: #endif
! 143: }
! 144: else {
! 145: /* Note that on some platforms 'timeout' may be modified by select().
! 146: If you need access to the original value save a copy beforehand. */
! 147: rc = select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout);
! 148: }
! 149:
! 150: if(tvdiff(tvnow(), mp_start) > MULTI_PERFORM_HANG_TIMEOUT) {
! 151: fprintf(stderr,
! 152: "ABORTING: Since it seems that we would have run forever.\n");
! 153: break;
! 154: }
! 155:
! 156: switch(rc) {
! 157: case -1: /* select error */
! 158: break;
! 159: case 0: /* timeout */
! 160: default: /* action */
! 161: curl_multi_perform(mcurl, &still_running);
! 162: break;
! 163: }
! 164: }
! 165:
! 166: /* Always cleanup */
! 167: curl_multi_remove_handle(mcurl, curl);
! 168: curl_multi_cleanup(mcurl);
! 169: curl_easy_cleanup(curl);
! 170: curl_global_cleanup();
! 171:
! 172: return 0;
! 173: }
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