.\" $Id$
.\"
.TH curl_multi_setopt 3 "8 Jan 2006" "libcurl 7.16.0" "libcurl Manual"
.SH NAME
curl_multi_setopt \- set options for a curl multi handle
.SH SYNOPSIS
#include <curl/curl.h>

CURLMcode curl_multi_setopt(CURLM * multi_handle, CURLMoption option, param);
.SH DESCRIPTION
curl_multi_setopt() is used to tell a libcurl multi handle how to behave. By
using the appropriate options to \fIcurl_multi_setopt\fP, you can change
libcurl's behaviour when using that multi handle.  All options are set with
the \fIoption\fP followed by the parameter \fIparam\fP. That parameter can be
a \fBlong\fP, a \fBfunction pointer\fP, an \fBobject pointer\fP or a
\fBcurl_off_t\fP type, depending on what the specific option expects. Read
this manual carefully as bad input values may cause libcurl to behave badly!
You can only set one option in each function call.

.SH OPTIONS
.IP CURLMOPT_SOCKETFUNCTION
Pass a pointer to a function matching the curl_socket_callback prototype. The
\fIcurl_multi_socket(3)\fP functions inform the application about updates in
the socket (file descriptor) status by doing none, one or multiple calls to
the curl_socket_callback given in the \fBparam\fP argument. They update the
status with changes since the previous time a \fIcurl_multi_socket(3)\fP
function was called. If the given callback pointer is NULL, no callback will
be called. Set the callback's \fBuserp\fP argument with
\fICURLMOPT_SOCKETDATA\fP.  See \fIcurl_multi_socket(3)\fP for more callback
details.
.IP CURLMOPT_SOCKETDATA
Pass a pointer to whatever you want passed to the curl_socket_callback's forth
argument, the userp pointer. This is not used by libcurl but only passed-thru
as-is. Set the callback pointer with \fICURLMOPT_SOCKETFUNCTION\fP.
.IP CURLMOPT_PIPELINING
Pass a long set to 1 to enable or 0 to disable. Enabling pipelining on a multi
handle will make it attempt to perform HTTP Pipelining as far as possible for
transfers using this handle. This means that if you add a second request that
can use an already existing connection, the second request will be \&"piped"
on the same connection rather than being executed in parallell. (Added in
7.16.0)
.SH RETURNS
The standard CURLMcode for multi interface error codes. Note that it returns a
CURLM_UNKNOWN_OPTION if you try setting an option that this version of libcurl
doesn't know of.
.SH AVAILABILITY
This function was added in libcurl 7.15.4.
.SH "SEE ALSO"
.BR curl_multi_cleanup "(3), " curl_multi_init "(3), "
.BR curl_multi_socket "(3), " curl_multi_info_read "(3)"