85 lines
4.2 KiB
Groff
85 lines
4.2 KiB
Groff
.\" $Id$
|
|
.\"
|
|
.TH curl_multi_setopt 3 "10 Oct 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(3)\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 \fBcurl_socket_callback\fP
|
|
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 \fBcurl_socket_callback\fP'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)
|
|
.IP CURLMOPT_TIMERFUNCTION
|
|
Pass a pointer to a function matching the \fBcurl_multi_timer_callback\fP
|
|
prototype. This function will then be called when the timeout value
|
|
changes. The timeout value is at what latest time the application should call
|
|
one of the \&"performing" functions of the multi interface
|
|
(\fIcurl_multi_socket(3)\fP, \fIcurl_multi_socket_all(3)\fP and
|
|
\fIcurl_multi_perform(3)\fP) - to allow libcurl to keep timeouts and retries
|
|
etc to work. A timeout value of -1 means that there is no timeout at all, and
|
|
0 means that the timeout is already reached. Libcurl attempts to limit calling
|
|
this only when the fixed future timeout time actually change. See also
|
|
\fICURLMOPT_TIMERDATA\fP. This callback can be used instead of, or in addition
|
|
to, \fIcurl_multi_timeout(3)\fP. (Added in 7.16.0)
|
|
.IP CURLMOPT_TIMERDATA
|
|
Pass a pointer to whatever you want passed to the
|
|
\fBcurl_multi_timer_callback\fP's third argument, the userp pointer. This is
|
|
not used by libcurl but only passed-thru as-is. Set the callback pointer with
|
|
\fICURLMOPT_TIMERFUNCTION\fP. (Added in 7.16.0)
|
|
.IP CURLMOPT_MAXCONNECTS
|
|
Pass a long. The set number will be used as the maximum amount of
|
|
simultaneously open connections that libcurl may cache. Default is 10, and
|
|
libcurl will enlarge the size for each added easy handle to make it fit 4
|
|
times the number of added easy handles.
|
|
|
|
By setting this option, you can prevent the cache size to grow beyond the
|
|
limit set by you.
|
|
|
|
When the cache is full, curl closes the oldest one in the cache to prevent the
|
|
number of open connections to increase.
|
|
|
|
This option is for the multi handle's use only, when using the easy interface
|
|
you should instead use the \fICURLOPT_MAXCONNECTS\fP option.
|
|
|
|
(Added in 7.16.3)
|
|
.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)"
|