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c3ea3eb6a3
* Elaborates on default values of some curl_easy_setopt() options. * Reminds the user to cast variadic arguments to curl_easy_setopt() to 'void *' where curl internally interprets them as such. * Clarifies the working of the CURLOPT_SEEKFUNCTION option for curl_easy_setopt(). * Fixes typo 'forth' → 'fourth'. * Elaborates on CURL_SOCKET_TIMEOUT. * Adds some missing periods. * Notes that the return value of curl_version() must not be passed to free().
107 lines
5.4 KiB
Groff
107 lines
5.4 KiB
Groff
.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at http://curl.haxx.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" **************************************************************************
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.TH curl_multi_setopt 3 "10 Oct 2006" "libcurl 7.16.0" "libcurl Manual"
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.SH NAME
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curl_multi_setopt \- set options for a curl multi handle
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.SH SYNOPSIS
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#include <curl/curl.h>
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CURLMcode curl_multi_setopt(CURLM * multi_handle, CURLMoption option, param);
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.SH DESCRIPTION
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curl_multi_setopt() is used to tell a libcurl multi handle how to behave. By
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using the appropriate options to \fIcurl_multi_setopt(3)\fP, you can change
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libcurl's behaviour when using that multi handle. All options are set with
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the \fIoption\fP followed by the parameter \fIparam\fP. That parameter can be
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a \fBlong\fP, a \fBfunction pointer\fP, an \fBobject pointer\fP or a
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\fBcurl_off_t\fP type, depending on what the specific option expects. Read
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this manual carefully as bad input values may cause libcurl to behave badly!
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You can only set one option in each function call.
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.SH OPTIONS
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.IP CURLMOPT_SOCKETFUNCTION
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Pass a pointer to a function matching the \fBcurl_socket_callback\fP
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prototype. The \fIcurl_multi_socket_action(3)\fP function informs the
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application about updates in the socket (file descriptor) status by doing
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none, one, or multiple calls to the curl_socket_callback given in the
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\fBparam\fP argument. They update the status with changes since the previous
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time a \fIcurl_multi_socket(3)\fP function was called. If the given callback
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pointer is NULL, no callback will be called. Set the callback's \fBuserp\fP
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argument with \fICURLMOPT_SOCKETDATA\fP. See \fIcurl_multi_socket(3)\fP for
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more callback details.
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.IP CURLMOPT_SOCKETDATA
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Pass a pointer to whatever you want passed to the \fBcurl_socket_callback\fP's
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fourth argument, the userp pointer. This is not used by libcurl but only
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passed-thru as-is. Set the callback pointer with
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\fICURLMOPT_SOCKETFUNCTION\fP.
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.IP CURLMOPT_PIPELINING
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Pass a long set to 1 to enable or 0 to disable. Enabling pipelining on a multi
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handle will make it attempt to perform HTTP Pipelining as far as possible for
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transfers using this handle. This means that if you add a second request that
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can use an already existing connection, the second request will be \&"piped"
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on the same connection rather than being executed in parallel. (Added in
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7.16.0)
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.IP CURLMOPT_TIMERFUNCTION
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Pass a pointer to a function matching the \fBcurl_multi_timer_callback\fP
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prototype: int curl_multi_timer_callback(CURLM *multi /* multi handle */,
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long timeout_ms /* timeout in milliseconds */, void *userp /* TIMERDATA */).
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This function will then be called when the timeout value
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changes. The timeout value is at what latest time the application should call
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one of the \&"performing" functions of the multi interface
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(\fIcurl_multi_socket_action(3)\fP and \fIcurl_multi_perform(3)\fP) - to allow
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libcurl to keep timeouts and retries etc to work. A timeout value of -1 means
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that there is no timeout at all, and 0 means that the timeout is already
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reached. Libcurl attempts to limit calling this only when the fixed future
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timeout time actually changes. See also \fICURLMOPT_TIMERDATA\fP. The callback
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should return 0 on success, and -1 on error. This
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callback can be used instead of, or in addition to,
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\fIcurl_multi_timeout(3)\fP. (Added in 7.16.0)
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.IP CURLMOPT_TIMERDATA
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Pass a pointer to whatever you want passed to the
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\fBcurl_multi_timer_callback\fP's third argument, the userp pointer. This is
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not used by libcurl but only passed-thru as-is. Set the callback pointer with
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\fICURLMOPT_TIMERFUNCTION\fP. (Added in 7.16.0)
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.IP CURLMOPT_MAXCONNECTS
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Pass a long. The set number will be used as the maximum amount of
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simultaneously open connections that libcurl may cache. Default is 10, and
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libcurl will enlarge the size for each added easy handle to make it fit 4
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times the number of added easy handles.
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By setting this option, you can prevent the cache size from growing beyond the
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limit set by you.
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When the cache is full, curl closes the oldest one in the cache to prevent the
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number of open connections from increasing.
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This option is for the multi handle's use only, when using the easy interface
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you should instead use the \fICURLOPT_MAXCONNECTS\fP option.
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(Added in 7.16.3)
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.SH RETURNS
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The standard CURLMcode for multi interface error codes. Note that it returns a
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CURLM_UNKNOWN_OPTION if you try setting an option that this version of libcurl
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doesn't know of.
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.SH AVAILABILITY
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This function was added in libcurl 7.15.4.
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.SH "SEE ALSO"
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.BR curl_multi_cleanup "(3), " curl_multi_init "(3), "
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.BR curl_multi_socket "(3), " curl_multi_info_read "(3)"
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