Annotation of embedaddon/curl/docs/examples/multi-double.c, revision 1.1
1.1 ! misho 1: /***************************************************************************
! 2: * _ _ ____ _
! 3: * Project ___| | | | _ \| |
! 4: * / __| | | | |_) | |
! 5: * | (__| |_| | _ <| |___
! 6: * \___|\___/|_| \_\_____|
! 7: *
! 8: * Copyright (C) 1998 - 2018, 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: /* <DESC>
! 23: * multi interface code doing two parallel HTTP transfers
! 24: * </DESC>
! 25: */
! 26: #include <stdio.h>
! 27: #include <string.h>
! 28:
! 29: /* somewhat unix-specific */
! 30: #include <sys/time.h>
! 31: #include <unistd.h>
! 32:
! 33: /* curl stuff */
! 34: #include <curl/curl.h>
! 35:
! 36: /*
! 37: * Simply download two HTTP files!
! 38: */
! 39: int main(void)
! 40: {
! 41: CURL *http_handle;
! 42: CURL *http_handle2;
! 43: CURLM *multi_handle;
! 44:
! 45: int still_running = 0; /* keep number of running handles */
! 46:
! 47: http_handle = curl_easy_init();
! 48: http_handle2 = curl_easy_init();
! 49:
! 50: /* set options */
! 51: curl_easy_setopt(http_handle, CURLOPT_URL, "https://www.example.com/");
! 52:
! 53: /* set options */
! 54: curl_easy_setopt(http_handle2, CURLOPT_URL, "http://localhost/");
! 55:
! 56: /* init a multi stack */
! 57: multi_handle = curl_multi_init();
! 58:
! 59: /* add the individual transfers */
! 60: curl_multi_add_handle(multi_handle, http_handle);
! 61: curl_multi_add_handle(multi_handle, http_handle2);
! 62:
! 63: /* we start some action by calling perform right away */
! 64: curl_multi_perform(multi_handle, &still_running);
! 65:
! 66: while(still_running) {
! 67: struct timeval timeout;
! 68: int rc; /* select() return code */
! 69: CURLMcode mc; /* curl_multi_fdset() return code */
! 70:
! 71: fd_set fdread;
! 72: fd_set fdwrite;
! 73: fd_set fdexcep;
! 74: int maxfd = -1;
! 75:
! 76: long curl_timeo = -1;
! 77:
! 78: FD_ZERO(&fdread);
! 79: FD_ZERO(&fdwrite);
! 80: FD_ZERO(&fdexcep);
! 81:
! 82: /* set a suitable timeout to play around with */
! 83: timeout.tv_sec = 1;
! 84: timeout.tv_usec = 0;
! 85:
! 86: curl_multi_timeout(multi_handle, &curl_timeo);
! 87: if(curl_timeo >= 0) {
! 88: timeout.tv_sec = curl_timeo / 1000;
! 89: if(timeout.tv_sec > 1)
! 90: timeout.tv_sec = 1;
! 91: else
! 92: timeout.tv_usec = (curl_timeo % 1000) * 1000;
! 93: }
! 94:
! 95: /* get file descriptors from the transfers */
! 96: mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
! 97:
! 98: if(mc != CURLM_OK) {
! 99: fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
! 100: break;
! 101: }
! 102:
! 103: /* On success the value of maxfd is guaranteed to be >= -1. We call
! 104: select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
! 105: no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
! 106: to sleep 100ms, which is the minimum suggested value in the
! 107: curl_multi_fdset() doc. */
! 108:
! 109: if(maxfd == -1) {
! 110: #ifdef _WIN32
! 111: Sleep(100);
! 112: rc = 0;
! 113: #else
! 114: /* Portable sleep for platforms other than Windows. */
! 115: struct timeval wait = { 0, 100 * 1000 }; /* 100ms */
! 116: rc = select(0, NULL, NULL, NULL, &wait);
! 117: #endif
! 118: }
! 119: else {
! 120: /* Note that on some platforms 'timeout' may be modified by select().
! 121: If you need access to the original value save a copy beforehand. */
! 122: rc = select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout);
! 123: }
! 124:
! 125: switch(rc) {
! 126: case -1:
! 127: /* select error */
! 128: break;
! 129: case 0:
! 130: default:
! 131: /* timeout or readable/writable sockets */
! 132: curl_multi_perform(multi_handle, &still_running);
! 133: break;
! 134: }
! 135: }
! 136:
! 137: curl_multi_cleanup(multi_handle);
! 138:
! 139: curl_easy_cleanup(http_handle);
! 140: curl_easy_cleanup(http_handle2);
! 141:
! 142: return 0;
! 143: }
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