un-nest curl

curl-8.15.0/docs/examples/threaded-ssl.c

@@ -0,0 +1,99 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ * SPDX-License-Identifier: curl
+ *
+ ***************************************************************************/
+/* <DESC>
+ * Show the required mutex callback setups for GnuTLS and OpenSSL when using
+ * libcurl multi-threaded.
+ * </DESC>
+ */
+/* A multi-threaded example that uses pthreads and fetches 4 remote files at
+ * once over HTTPS.
+ *
+ * Recent versions of OpenSSL and GnuTLS are thread safe by design, assuming
+ * support for the underlying OS threading API is built-in. Older revisions
+ * of this example demonstrated locking callbacks for the SSL library, which
+ * are no longer necessary. An older revision with callbacks can be found at
+ * https://github.com/curl/curl/blob/curl-7_88_1/docs/examples/threaded-ssl.c
+ */
+
+#define USE_OPENSSL /* or USE_GNUTLS accordingly */
+
+#include <stdio.h>
+#include <pthread.h>
+#include <curl/curl.h>
+
+#define NUMT 4
+
+/* List of URLs to fetch.*/
+static const char * const urls[]= {
+  "https://www.example.com/",
+  "https://www2.example.com/",
+  "https://www3.example.com/",
+  "https://www4.example.com/",
+};
+
+static void *pull_one_url(void *url)
+{
+  CURL *curl;
+
+  curl = curl_easy_init();
+  curl_easy_setopt(curl, CURLOPT_URL, url);
+  /* this example does not verify the server's certificate, which means we
+     might be downloading stuff from an impostor */
+  curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
+  curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
+  curl_easy_perform(curl); /* ignores error */
+  curl_easy_cleanup(curl);
+
+  return NULL;
+}
+
+int main(int argc, char **argv)
+{
+  pthread_t tid[NUMT];
+  int i;
+  (void)argc; /* we do not use any arguments in this example */
+  (void)argv;
+
+  /* Must initialize libcurl before any threads are started */
+  curl_global_init(CURL_GLOBAL_ALL);
+
+  for(i = 0; i < NUMT; i++) {
+    int error = pthread_create(&tid[i],
+                               NULL, /* default attributes please */
+                               pull_one_url,
+                               (void *)urls[i]);
+    if(0 != error)
+      fprintf(stderr, "Couldn't run thread number %d, errno %d\n", i, error);
+    else
+      fprintf(stderr, "Thread %d, gets %s\n", i, urls[i]);
+  }
+
+  /* now wait for all threads to terminate */
+  for(i = 0; i < NUMT; i++) {
+    pthread_join(tid[i], NULL);
+    fprintf(stderr, "Thread %d terminated\n", i);
+  }
+
+  return 0;
+}