[Global]: loading init

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

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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_PREREQDATA
+Section: 3
+Source: libcurl
+See-also:
+  - CURLINFO_PRIMARY_IP (3)
+  - CURLINFO_PRIMARY_PORT (3)
+  - CURLOPT_PREREQFUNCTION (3)
+---
+
+# NAME
+
+CURLOPT_PREREQDATA - pointer passed to the pre-request callback
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PREREQDATA, void *pointer);
+~~~
+
+# DESCRIPTION
+
+Pass a *pointer* that is untouched by libcurl and passed as the first
+argument in the pre-request callback set with CURLOPT_PREREQFUNCTION(3).
+
+# DEFAULT
+
+NULL
+
+# PROTOCOLS
+
+All
+
+# EXAMPLE
+
+~~~c
+struct priv {
+  void *custom;
+};
+
+static int prereq_callback(void *clientp,
+                           char *conn_primary_ip,
+                           char *conn_local_ip,
+                           int conn_primary_port,
+                           int conn_local_port)
+{
+  printf("Connection made to %s:%d\n", conn_primary_ip, conn_primary_port);
+  return CURL_PREREQFUNC_OK;
+}
+
+int main(void)
+{
+  struct priv prereq_data;
+  CURL *curl = curl_easy_init();
+  if(curl) {
+    curl_easy_setopt(curl, CURLOPT_PREREQFUNCTION, prereq_callback);
+    curl_easy_setopt(curl, CURLOPT_PREREQDATA, &prereq_data);
+    curl_easy_perform(curl);
+  }
+}
+~~~
+
+# AVAILABILITY
+
+Added in 7.80.0
+
+# RETURN VALUE
+
+Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.