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+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2017, 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.haxx.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.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_SOCKOPTDATA 3 "16 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_SOCKOPTDATA \- custom pointer to pass to sockopt callback
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SOCKOPTDATA, void *pointer);
+.SH DESCRIPTION
+Pass a \fIpointer\fP that will be untouched by libcurl and passed as the first
+argument in the sockopt callback set with \fICURLOPT_SOCKOPTFUNCTION(3)\fP.
+.SH DEFAULT
+The default value of this parameter is NULL.
+.SH PROTOCOLS
+All
+.SH EXAMPLE
+.nf
+static int sockopt_callback(void *clientp, curl_socket_t curlfd,
+                            curlsocktype purpose)
+{
+  int val = *(int *)clientp;
+  setsockopt(curldfd, SOL_SOCKET, SO_RCVBUF, (const char *)&val, sizeof(val));
+  return CURL_SOCKOPT_OK;
+}
+
+curl = curl_easy_init();
+if(curl) {
+  int recvbuffersize = 256 * 1024;
+
+  curl_easy_setopt(curl, CURLOPT_URL, "http://example.com/");
+
+  /* call this function to set options for the socket */
+  curl_easy_setopt(curl, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
+  curl_easy_setopt(curl, CURLOPT_SOCKOPTDATA, &recvbuffersize);
+
+  res = curl_easy_perform(curl);
+
+  curl_easy_cleanup(curl);
+}
+.fi
+.SH AVAILABILITY
+Added in 7.16.0
+.SH RETURN VALUE
+Returns \fICURLE_OK\fP if the option is supported, and \fICURLE_UNKNOWN_OPTION\fP if not.
+.SH "SEE ALSO"
+.BR CURLOPT_SOCKOPTFUNCTION "(3), " CURLOPT_OPENSOCKETFUNCTION "(3), "