diff options
Diffstat (limited to 'docs/libcurl/gnurl_share_setopt.3')
| -rw-r--r-- | docs/libcurl/gnurl_share_setopt.3 | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/docs/libcurl/gnurl_share_setopt.3 b/docs/libcurl/gnurl_share_setopt.3 new file mode 100644 index 000000000..fd464b349 --- /dev/null +++ b/docs/libcurl/gnurl_share_setopt.3 @@ -0,0 +1,112 @@ +.\" ************************************************************************** +.\" * _ _ ____ _ +.\" * Project ___| | | | _ \| | +.\" * / __| | | | |_) | | +.\" * | (__| |_| | _ <| |___ +.\" * \___|\___/|_| \_\_____| +.\" * +.\" * Copyright (C) 1998 - 2019, 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. +.\" * +.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY +.\" * KIND, either express or implied. +.\" * +.\" ************************************************************************** +.TH gnurl_share_setopt 3 "8 Aug 2003" "libcurl 7.10.7" "libgnurl Manual" +.SH NAME +curl_share_setopt - Set options for a shared object +.SH SYNOPSIS +.B #include <gnurl/curl.h> +.sp +CURLSHcode curl_share_setopt(CURLSH *share, CURLSHoption option, parameter); +.ad +.SH DESCRIPTION +Set the \fIoption\fP to \fIparameter\fP for the given \fIshare\fP. +.SH OPTIONS +.IP CURLSHOPT_LOCKFUNC +The \fIparameter\fP must be a pointer to a function matching the following +prototype: + +void lock_function(CURL *handle, curl_lock_data data, curl_lock_access access, +void *userptr); + +The \fIdata\fP argument tells what kind of data libcurl wants to lock. Make +sure that the callback uses a different lock for each kind of data. + +\fIaccess\fP defines what access type libcurl wants, shared or single. + +\fIuserptr\fP is the pointer you set with \fICURLSHOPT_USERDATA\fP. +.IP CURLSHOPT_UNLOCKFUNC +The \fIparameter\fP must be a pointer to a function matching the following +prototype: + +void unlock_function(CURL *handle, curl_lock_data data, void *userptr); + +\fIdata\fP defines what data libcurl wants to unlock, and you must make sure +that only one lock is given at any time for each kind of data. + +\fIuserptr\fP is the pointer you set with \fICURLSHOPT_USERDATA\fP. +.IP CURLSHOPT_SHARE +The \fIparameter\fP specifies a type of data that should be shared. This may +be set to one of the values described below. +.RS +.IP CURL_LOCK_DATA_COOKIE +Cookie data will be shared across the easy handles using this shared object. +.IP CURL_LOCK_DATA_DNS +Cached DNS hosts will be shared across the easy handles using this shared +object. Note that when you use the multi interface, all easy handles added to +the same multi handle will share DNS cache by default without using this +option. +.IP CURL_LOCK_DATA_SSL_SESSION +SSL session IDs will be shared across the easy handles using this shared +object. This will reduce the time spent in the SSL handshake when reconnecting +to the same server. Note SSL session IDs are reused within the same easy handle +by default. Note this symbol was added in 7.10.3 but was not implemented until +7.23.0. +.IP CURL_LOCK_DATA_CONNECT +Put the connection cache in the share object and make all easy handles using +this share object share the connection cache. Using this, you can for example +do multi-threaded libcurl use with one handle in each thread, and yet have a +shared pool of unused connections and this way get way better connection +re-use than if you use one separate pool in each thread. + +Connections that are used for HTTP/1.1 Pipelining or HTTP/2 multiplexing only +get additional transfers added to them if the existing connection is held by +the same multi or easy handle. libcurl does not support doing HTTP/2 streams +in different threads using a shared connection. + +Support for \fBCURL_LOCK_DATA_CONNECT\fP was added in 7.57.0, but the symbol +existed before this. + +Note that when you use the multi interface, all easy handles added to the same +multi handle will share connection cache by default without using this option. +.IP CURL_LOCK_DATA_PSL +The Public Suffix List stored in the share object is made available to all +easy handle bound to the later. Since the Public Suffix List is periodically +refreshed, this avoids updates in too many different contexts. + +\fBCURL_LOCK_DATA_PSL\fP exists since 7.61.0. + +Note that when you use the multi interface, all easy handles added to the same +multi handle will share PSL cache by default without using this option. +.RE +.IP CURLSHOPT_UNSHARE +This option does the opposite of \fICURLSHOPT_SHARE\fP. It specifies that +the specified \fIparameter\fP will no longer be shared. Valid values are +the same as those for \fICURLSHOPT_SHARE\fP. +.IP CURLSHOPT_USERDATA +The \fIparameter\fP allows you to specify a pointer to data that will be passed +to the lock_function and unlock_function each time it is called. +.SH RETURN VALUE +CURLSHE_OK (zero) means that the option was set properly, non-zero means an +error occurred as \fI<gnurl/curl.h>\fP defines. See the \fIlibcurl-errors.3\fP +man page for the full list with descriptions. +.SH "SEE ALSO" +.BR curl_share_cleanup "(3), " curl_share_init "(3)" |