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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_IOCTLDATA 3 "16 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_IOCTLDATA \- custom pointer passed to I/O callback
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_IOCTLDATA, void *pointer);
+.SH DESCRIPTION
+Pass the \fIpointer\fP that will be untouched by libcurl and passed as the 3rd
+argument in the ioctl callback set with \fICURLOPT_IOCTLFUNCTION(3)\fP.
+.SH DEFAULT
+By default, the value of this parameter is NULL.
+.SH PROTOCOLS
+Used with HTTP
+.SH EXAMPLE
+.nf
+static curlioerr ioctl_callback(CURL *handle, int cmd, void *clientp)
+{
+  struct data *io = (struct data *)clientp;
+  if(cmd == CURLIOCMD_RESTARTREAD) {
+    lseek(fd, 0, SEEK_SET);
+    current_offset = 0;
+    return CURLIOE_OK;
+  }
+  return CURLIOE_UNKNOWNCMD;
+}
+{
+  struct data ioctl_data;
+  curl_easy_setopt(curl, CURLOPT_IOCTLFUNCTION, ioctl_callback);
+  curl_easy_setopt(curl, CURLOPT_IOCTLDATA, &ioctl_data);
+}
+.fi
+.SH AVAILABILITY
+Added in 7.12.3
+.SH RETURN VALUE
+Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+.SH "SEE ALSO"
+.BR CURLOPT_IOCTLFUNCTION "(3), " CURLOPT_SEEKFUNCTION "(3), "