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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 CURLMOPT_SOCKETDATA 3 "3 Nov 2014" "libcurl 7.39.0" "curl_multi_setopt options"
+.SH NAME
+CURLMOPT_SOCKETDATA \- custom pointer passed to the socket callback
+.SH SYNOPSIS
+.nf
+#include <curl/curl.h>
+
+CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_SOCKETDATA, void *pointer);
+.SH DESCRIPTION
+A data \fIpointer\fP to pass to the socket callback set with the
+\fICURLMOPT_SOCKETFUNCTION(3)\fP option.
+
+This pointer will not be touched by libcurl but will only be passed in to the
+socket callbacks's \fBuserp\fP argument.
+.SH DEFAULT
+NULL
+.SH PROTOCOLS
+All
+.SH EXAMPLE
+.nf
+static int sock_cb(CURL *e, curl_socket_t s, int what, void *cbp, void *sockp)
+{
+  GlobalInfo *g = (GlobalInfo*) cbp;
+  SockInfo *fdp = (SockInfo*) sockp;
+
+  if(what == CURL_POLL_REMOVE) {
+    remsock(fdp);
+  }
+  else {
+    if(!fdp) {
+      addsock(s, e, what, g);
+    }
+    else {
+      setsock(fdp, s, e, what, g);
+    }
+  }
+  return 0;
+}
+
+main()
+{
+  GlobalInfo setup;
+  /* ... use socket callback and custom pointer */
+  curl_multi_setopt(multi, CURLMOPT_SOCKETFUNCTION, sock_cb);
+  curl_multi_setopt(multi, CURLMOPT_SOCKETDATA, &setup);
+}
+.fi
+.SH AVAILABILITY
+Added in 7.15.4
+.SH RETURN VALUE
+Returns CURLM_OK.
+.SH "SEE ALSO"
+.BR CURLMOPT_SOCKETFUNCTION "(3), " curl_multi_socket_action "(3), "
+.BR CURLMOPT_TIMERFUNCTION "(3) "