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.\" **************************************************************************
.\" * _ _ ____ _
.\" * Project ___| | | | _ \| |
.\" * / __| | | | |_) | |
.\" * | (__| |_| | _ <| |___
.\" * \___|\___/|_| \_\_____|
.\" *
.\" * Copyright (C) 1998 - 2016, 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.
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
.\" * KIND, either express or implied.
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.\" **************************************************************************
.\"
.TH CURLMOPT_SOCKETFUNCTION 3 "3 Nov 2016" "libcurl 7.39.0" "curl_multi_setopt options"
.SH NAME
CURLMOPT_SOCKETFUNCTION \- callback informed about what to wait for
.SH SYNOPSIS
.nf
#include <curl/curl.h>
int socket_callback(CURL *easy, /* easy handle */
curl_socket_t s, /* socket */
int what, /* describes the socket */
void *userp, /* private callback pointer */
void *socketp); /* private socket pointer */
CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_SOCKETFUNCTION, socket_callback);
.SH DESCRIPTION
Pass a pointer to your callback function, which should match the prototype
shown above.
When the \fIcurl_multi_socket_action(3)\fP function runs, it informs the
application about updates in the socket (file descriptor) status by doing
none, one, or multiple calls to the \fBsocket_callback\fP. The callback gets
status updates with changes since the previous time the callback was called.
If the given callback pointer is NULL, no callback will be called. Set the
callback's \fBuserp\fP argument with \fICURLMOPT_SOCKETDATA(3)\fP. See
\fIcurl_multi_socket_action(3)\fP for more details on how the callback is used
and should work.
The \fBwhat\fP parameter informs the callback on the status of the given
socket. It can hold one of these values:
.IP CURL_POLL_IN
Wait for incoming data. For the socket to become readable.
.IP CURL_POLL_OUT
Wait for outgoing data. For the socket to become writable.
.IP CURL_POLL_INOUT
Wait for incoming and outgoing data. For the socket to become readable or
writable.
.IP CURL_POLL_REMOVE
The specified socket/file descriptor is no longer used by libcurl.
.SH DEFAULT
NULL (no callback)
.SH PROTOCOLS
All
.SH EXAMPLE
TODO
.SH AVAILABILITY
Added in 7.15.4
.SH RETURN VALUE
Returns CURLM_OK.
.SH "SEE ALSO"
.BR CURLMOPT_SOCKETDATA "(3), " curl_multi_socket_action "(3), "
.BR CURLMOPT_TIMERFUNCTION "(3) "