annotate mupdf-source/thirdparty/curl/docs/examples/10-at-a-time.c @ 46:7ee69f120f19 default tip

>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2
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1 /***************************************************************************
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2 * _ _ ____ _
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3 * Project ___| | | | _ \| |
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4 * / __| | | | |_) | |
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5 * | (__| |_| | _ <| |___
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6 * \___|\___/|_| \_\_____|
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7 *
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8 * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 *
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10 * This software is licensed as described in the file COPYING, which
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11 * you should have received as part of this distribution. The terms
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12 * are also available at https://curl.haxx.se/docs/copyright.html.
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13 *
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14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 * copies of the Software, and permit persons to whom the Software is
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16 * furnished to do so, under the terms of the COPYING file.
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17 *
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18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 * KIND, either express or implied.
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20 *
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21 ***************************************************************************/
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22 /* <DESC>
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23 * Download many files in parallel, in the same thread.
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24 * </DESC>
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25 */
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26
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27 #include <errno.h>
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28 #include <stdlib.h>
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29 #include <string.h>
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30 #ifndef WIN32
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31 # include <unistd.h>
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32 #endif
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33 #include <curl/curl.h>
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34
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35 static const char *urls[] = {
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36 "https://www.microsoft.com",
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37 "https://opensource.org",
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38 "https://www.google.com",
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39 "https://www.yahoo.com",
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40 "https://www.ibm.com",
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41 "https://www.mysql.com",
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42 "https://www.oracle.com",
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43 "https://www.ripe.net",
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44 "https://www.iana.org",
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45 "https://www.amazon.com",
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46 "https://www.netcraft.com",
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47 "https://www.heise.de",
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48 "https://www.chip.de",
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49 "https://www.ca.com",
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50 "https://www.cnet.com",
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51 "https://www.mozilla.org",
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52 "https://www.cnn.com",
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53 "https://www.wikipedia.org",
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54 "https://www.dell.com",
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55 "https://www.hp.com",
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56 "https://www.cert.org",
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57 "https://www.mit.edu",
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58 "https://www.nist.gov",
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59 "https://www.ebay.com",
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60 "https://www.playstation.com",
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61 "https://www.uefa.com",
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62 "https://www.ieee.org",
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63 "https://www.apple.com",
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64 "https://www.symantec.com",
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65 "https://www.zdnet.com",
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66 "https://www.fujitsu.com/global/",
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67 "https://www.supermicro.com",
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68 "https://www.hotmail.com",
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69 "https://www.ietf.org",
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70 "https://www.bbc.co.uk",
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71 "https://news.google.com",
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72 "https://www.foxnews.com",
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73 "https://www.msn.com",
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74 "https://www.wired.com",
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75 "https://www.sky.com",
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76 "https://www.usatoday.com",
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77 "https://www.cbs.com",
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78 "https://www.nbc.com/",
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79 "https://slashdot.org",
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80 "https://www.informationweek.com",
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81 "https://apache.org",
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82 "https://www.un.org",
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83 };
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84
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85 #define MAX_PARALLEL 10 /* number of simultaneous transfers */
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86 #define NUM_URLS sizeof(urls)/sizeof(char *)
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87
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88 static size_t write_cb(char *data, size_t n, size_t l, void *userp)
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89 {
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90 /* take care of the data here, ignored in this example */
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91 (void)data;
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92 (void)userp;
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93 return n*l;
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94 }
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95
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96 static void add_transfer(CURLM *cm, int i)
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97 {
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98 CURL *eh = curl_easy_init();
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99 curl_easy_setopt(eh, CURLOPT_WRITEFUNCTION, write_cb);
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100 curl_easy_setopt(eh, CURLOPT_URL, urls[i]);
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101 curl_easy_setopt(eh, CURLOPT_PRIVATE, urls[i]);
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102 curl_multi_add_handle(cm, eh);
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103 }
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104
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105 int main(void)
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106 {
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107 CURLM *cm;
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108 CURLMsg *msg;
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109 unsigned int transfers = 0;
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110 int msgs_left = -1;
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111 int still_alive = 1;
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112
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113 curl_global_init(CURL_GLOBAL_ALL);
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114 cm = curl_multi_init();
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115
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116 /* Limit the amount of simultaneous connections curl should allow: */
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117 curl_multi_setopt(cm, CURLMOPT_MAXCONNECTS, (long)MAX_PARALLEL);
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118
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119 for(transfers = 0; transfers < MAX_PARALLEL; transfers++)
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120 add_transfer(cm, transfers);
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121
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122 do {
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123 curl_multi_perform(cm, &still_alive);
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124
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125 while((msg = curl_multi_info_read(cm, &msgs_left))) {
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126 if(msg->msg == CURLMSG_DONE) {
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127 char *url;
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128 CURL *e = msg->easy_handle;
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129 curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE, &url);
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130 fprintf(stderr, "R: %d - %s <%s>\n",
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131 msg->data.result, curl_easy_strerror(msg->data.result), url);
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132 curl_multi_remove_handle(cm, e);
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133 curl_easy_cleanup(e);
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134 }
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135 else {
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136 fprintf(stderr, "E: CURLMsg (%d)\n", msg->msg);
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137 }
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138 if(transfers < NUM_URLS)
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139 add_transfer(cm, transfers++);
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140 }
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141 if(still_alive)
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142 curl_multi_wait(cm, NULL, 0, 1000, NULL);
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143
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144 } while(still_alive || (transfers < NUM_URLS));
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145
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146 curl_multi_cleanup(cm);
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147 curl_global_cleanup();
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148
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149 return EXIT_SUCCESS;
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150 }