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comparison mupdf-source/thirdparty/curl/docs/libcurl/opts/CURLOPT_CLOSESOCKETFUNCTION.3 @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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23 .TH CURLOPT_CLOSESOCKETFUNCTION 3 "16 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
24 .SH NAME
25 CURLOPT_CLOSESOCKETFUNCTION \- callback to socket close replacement function
26 .SH SYNOPSIS
27 #include <curl/curl.h>
28
29 int closesocket_callback(void *clientp, curl_socket_t item);
30
31 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CLOSESOCKETFUNCTION, closesocket_callback);
32 .SH DESCRIPTION
33 Pass a pointer to your callback function, which should match the prototype
34 shown above.
35
36 This callback function gets called by libcurl instead of the \fIclose(3)\fP or
37 \fIclosesocket(3)\fP call when sockets are closed (not for any other file
38 descriptors). This is pretty much the reverse to the
39 \fICURLOPT_OPENSOCKETFUNCTION(3)\fP option. Return 0 to signal success and 1
40 if there was an error.
41
42 The \fIclientp\fP pointer is set with
43 \fICURLOPT_CLOSESOCKETDATA(3)\fP. \fIitem\fP is the socket libcurl wants to be
44 closed.
45 .SH DEFAULT
46 By default libcurl uses the standard socket close function.
47 .SH PROTOCOLS
48 All
49 .SH EXAMPLE
50 .nf
51 static int closesocket(void *clientp, curl_socket_t item)
52 {
53 printf("libcurl wants to close %d now\\n", (int)item);
54 return 0;
55 }
56
57 /* call this function to close sockets */
58 curl_easy_setopt(curl, CURLOPT_CLOSESOCKETFUNCTION, closesocket);
59 curl_easy_setopt(curl, CURLOPT_CLOSESOCKETDATA, &sockfd);
60 .fi
61 .SH AVAILABILITY
62 Added in 7.21.7
63 .SH RETURN VALUE
64 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
65 .SH "SEE ALSO"
66 .BR CURLOPT_CLOSESOCKETDATA "(3), " CURLOPT_OPENSOCKETFUNCTION "(3), "