[Global]: loading init

deps/curl/docs/libcurl/opts/CURLOPT_PROGRESSDATA.md

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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_PROGRESSDATA
+Section: 3
+Source: libcurl
+See-also:
+  - CURLOPT_PROGRESSFUNCTION (3)
+  - CURLOPT_XFERINFOFUNCTION (3)
+---
+
+# NAME
+
+CURLOPT_PROGRESSDATA - pointer passed to the progress callback
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROGRESSDATA, void *pointer);
+~~~
+
+# DESCRIPTION
+
+Pass a *pointer* that is untouched by libcurl and passed as the first
+argument in the progress callback set with CURLOPT_PROGRESSFUNCTION(3).
+
+# DEFAULT
+
+The default value of this parameter is NULL.
+
+# PROTOCOLS
+
+All
+
+# EXAMPLE
+
+~~~c
+struct progress {
+  char *private;
+  size_t size;
+};
+
+static size_t progress_callback(void *clientp,
+                                double dltotal,
+                                double dlnow,
+                                double ultotal,
+                                double ulnow)
+{
+  struct progress *memory = clientp;
+  printf("private: %p\n", memory->private);
+
+  /* use the values */
+
+  return 0; /* all is good */
+}
+
+int main(void)
+{
+  CURL *curl = curl_easy_init();
+  if(curl) {
+    struct progress data;
+
+    /* pass struct to callback  */
+    curl_easy_setopt(curl, CURLOPT_PROGRESSDATA, &data);
+    curl_easy_setopt(curl, CURLOPT_PROGRESSFUNCTION, progress_callback);
+
+    curl_easy_perform(curl);
+  }
+}
+~~~
+
+# AVAILABILITY
+
+Always
+
+# RETURN VALUE
+
+Returns CURLE_OK