| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /*************************************************************************** |
| 2 | * _ _ ____ _ |
| 3 | * Project ___| | | | _ \| | |
| 4 | * / __| | | | |_) | | |
| 5 | * | (__| |_| | _ <| |___ |
| 6 | * \___|\___/|_| \_\_____| |
| 7 | * |
| 8 | * Copyright (C) 1998 - 2016, 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 | * using the multi interface to do a single download |
| 24 | * </DESC> |
| 25 | */ |
| 26 | |
| 27 | #include <stdio.h> |
| 28 | #include <string.h> |
| 29 | |
| 30 | /* somewhat unix-specific */ |
| 31 | #include <sys/time.h> |
| 32 | #include <unistd.h> |
| 33 | |
| 34 | /* curl stuff */ |
| 35 | #include <curl/curl.h> |
| 36 | |
| 37 | #ifdef _WIN32 |
| 38 | #define WAITMS(x) Sleep(x) |
| 39 | #else |
| 40 | /* Portable sleep for platforms other than Windows. */ |
| 41 | #define WAITMS(x) \ |
| 42 | struct timeval wait = { 0, (x) * 1000 }; \ |
| 43 | (void)select(0, NULL, NULL, NULL, &wait); |
| 44 | #endif |
| 45 | |
| 46 | /* |
| 47 | * Simply download a HTTP file. |
| 48 | */ |
| 49 | int main(void) |
| 50 | { |
| 51 | CURL *http_handle; |
| 52 | CURLM *multi_handle; |
| 53 | |
| 54 | int still_running; /* keep number of running handles */ |
| 55 | int repeats = 0; |
| 56 | |
| 57 | curl_global_init(CURL_GLOBAL_DEFAULT); |
| 58 | |
| 59 | http_handle = curl_easy_init(); |
| 60 | |
| 61 | /* set the options (I left out a few, you'll get the point anyway) */ |
| 62 | curl_easy_setopt(http_handle, CURLOPT_URL, "http://www.example.com/"); |
| 63 | |
| 64 | /* init a multi stack */ |
| 65 | multi_handle = curl_multi_init(); |
| 66 | |
| 67 | /* add the individual transfers */ |
| 68 | curl_multi_add_handle(multi_handle, http_handle); |
| 69 | |
| 70 | /* we start some action by calling perform right away */ |
| 71 | curl_multi_perform(multi_handle, &still_running); |
| 72 | |
| 73 | do { |
| 74 | CURLMcode mc; /* curl_multi_wait() return code */ |
| 75 | int numfds; |
| 76 | |
| 77 | /* wait for activity, timeout or "nothing" */ |
| 78 | mc = curl_multi_wait(multi_handle, NULL, 0, 1000, &numfds); |
| 79 | |
| 80 | if(mc != CURLM_OK) { |
| 81 | fprintf(stderr, "curl_multi_wait() failed, code %d.\n", mc); |
| 82 | break; |
| 83 | } |
| 84 | |
| 85 | /* 'numfds' being zero means either a timeout or no file descriptors to |
| 86 | wait for. Try timeout on first occurrence, then assume no file |
| 87 | descriptors and no file descriptors to wait for means wait for 100 |
| 88 | milliseconds. */ |
| 89 | |
| 90 | if(!numfds) { |
| 91 | repeats++; /* count number of repeated zero numfds */ |
| 92 | if(repeats > 1) { |
| 93 | WAITMS(100); /* sleep 100 milliseconds */ |
| 94 | } |
| 95 | } |
| 96 | else |
| 97 | repeats = 0; |
| 98 | |
| 99 | curl_multi_perform(multi_handle, &still_running); |
| 100 | } while(still_running); |
| 101 | |
| 102 | curl_multi_remove_handle(multi_handle, http_handle); |
| 103 | |
| 104 | curl_easy_cleanup(http_handle); |
| 105 | |
| 106 | curl_multi_cleanup(multi_handle); |
| 107 | |
| 108 | curl_global_cleanup(); |
| 109 | |
| 110 | return 0; |
| 111 | } |