--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/curl/docs/libcurl/opts/CURLOPT_CLOSESOCKETFUNCTION.3	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,66 @@
+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  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_CLOSESOCKETFUNCTION 3 "16 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_CLOSESOCKETFUNCTION \- callback to socket close replacement function
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+int closesocket_callback(void *clientp, curl_socket_t item);
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CLOSESOCKETFUNCTION, closesocket_callback);
+.SH DESCRIPTION
+Pass a pointer to your callback function, which should match the prototype
+shown above.
+
+This callback function gets called by libcurl instead of the \fIclose(3)\fP or
+\fIclosesocket(3)\fP call when sockets are closed (not for any other file
+descriptors). This is pretty much the reverse to the
+\fICURLOPT_OPENSOCKETFUNCTION(3)\fP option. Return 0 to signal success and 1
+if there was an error.
+
+The \fIclientp\fP pointer is set with
+\fICURLOPT_CLOSESOCKETDATA(3)\fP. \fIitem\fP is the socket libcurl wants to be
+closed.
+.SH DEFAULT
+By default libcurl uses the standard socket close function.
+.SH PROTOCOLS
+All
+.SH EXAMPLE
+.nf
+static int closesocket(void *clientp, curl_socket_t item)
+{
+  printf("libcurl wants to close %d now\\n", (int)item);
+  return 0;
+}
+
+/* call this function to close sockets */
+curl_easy_setopt(curl, CURLOPT_CLOSESOCKETFUNCTION, closesocket);
+curl_easy_setopt(curl, CURLOPT_CLOSESOCKETDATA, &sockfd);
+.fi
+.SH AVAILABILITY
+Added in 7.21.7
+.SH RETURN VALUE
+Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+.SH "SEE ALSO"
+.BR CURLOPT_CLOSESOCKETDATA "(3), " CURLOPT_OPENSOCKETFUNCTION "(3), "