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curl_share_setopt.3: split out options into their own manpages

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CURLSHOPT_LOCKFUNC.3
CURLSHOPT_SHARE.3
CURLSHOPT_UNLOCKFUNC.3
CURLSHOPT_UNSHARE.3
CURLSHOPT_USERDATA.3

Closes #7998
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Daniel Stenberg 2021-11-12 10:56:05 +01:00
parent 2989b11377
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7 changed files with 370 additions and 70 deletions
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73
docs/libcurl/curl_share_setopt.3
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@ -31,78 +31,13 @@ CURLSHcode curl_share_setopt(CURLSH *share, CURLSHoption option, parameter);
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.
See \fICURLSHOPT_LOCKFUNC(3)\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.
See \fICURLSHOPT_UNLOCKFUNC(3)\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.
Note that this does not activate an easy handle's cookie handling. You can do
that separately by using \fICURLOPT_COOKIEFILE(3)\fP for example.
.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.
Note that due to a known bug, it is not safe to share connections this way
between multiple concurrent threads.
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
See \fICURLSHOPT_SHARE(3)\fP.
.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.
See \fICURLSHOPT_UNSHARE(3)\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.

70
docs/libcurl/opts/CURLSHOPT_LOCKFUNC.3 Normal file
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@ -0,0 +1,70 @@
.\" **************************************************************************
.\" * _ _ ____ _
.\" * Project ___| | | | _ \| |
.\" * / __| | | | |_) | |
.\" * | (__| |_| | _ <| |___
.\" * \___|\___/|_| \_\_____|
.\" *
.\" * Copyright (C) 1998 - 2021, 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.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 CURLSHOPT_LOCKFUNC 3 "8 Aug 2003" "libcurl 7.10.7" "libcurl Manual"
.SH NAME
CURLSHOPT_LOCKFUNC - mutex lock callback
.SH SYNOPSIS
.nf
#include <curl/curl.h>
void lockcb(CURL *handle, curl_lock_data data, curl_lock_access access,
void *userptr);
CURLSHcode curl_share_setopt(CURLSH *share, CURLSHOPT_LOCKFUNC, lockcb);
.fi
.SH DESCRIPTION
Set a mutex lock callback for the share object, to allow it to get used by
multiple threads concurrently. There's a corresponding
\fICURLSHOPT_UNLOCKFUNC(3)\fP callback called when the mutex is again relased.
The \fIlockcb\fP argument must be a pointer to a function matching the
prototype shown above. The arguments to the callback are:
\fIhandle\fP is the currently active easy handle in use when the share object
is intended to get used.
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 private pointer you set with \fICURLSHOPT_USERDATA\fP.
This pointer is not used by libcurl itself.
.SH PROTOCOLS
All
.SH EXAMPLE
.nf
CURLSHcode sh
share = curl_share_init();
sh = curl_share_setopt(share, CURLSHOPT_LOCKFUNC, mutex_lock);
if(sh)
printf("Error: %s\\n", curl_share_strerror(sh));
.fi
.SH AVAILABILITY
Added in 7.10
.SH RETURN VALUE
CURLSHE_OK (zero) means that the option was set properly, non-zero means an
error occurred. See \fIlibcurl-errors(3)\fP for the full list with
descriptions.
.SH "SEE ALSO"
.BR CURLSHOPT_UNLOCKFUNC "(3), "
.BR curl_share_setopt "(3), " curl_share_cleanup "(3), " curl_share_init "(3)"

97
docs/libcurl/opts/CURLSHOPT_SHARE.3 Normal file
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@ -0,0 +1,97 @@
.\" **************************************************************************
.\" * _ _ ____ _
.\" * Project ___| | | | _ \| |
.\" * / __| | | | |_) | |
.\" * | (__| |_| | _ <| |___
.\" * \___|\___/|_| \_\_____|
.\" *
.\" * Copyright (C) 1998 - 2021, 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.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 CURLSHOPT_SHARE 3 "8 Aug 2003" "libcurl 7.10.7" "libcurl Manual"
.SH NAME
CURLSHOPT_SHARE - add data to share
.SH SYNOPSIS
.nf
#include <curl/curl.h>
CURLSHcode curl_share_setopt(CURLSH *share, CURLSHOPT_SHARE, long type);
.fi
.SH DESCRIPTION
The \fItype\fP parameter specifies what specific data that should be shared
and kept in the share object that was created with \fIcurl_share_init(3)\fP.
The given \fItype\fP must be be one of the values described below. You can set
\fICURLSHOPT_SHARE(3)\fP multiple times with different data arguments to have
the share object share multiple types of data. Unset a type again by setting
\fICURLSHOPT_UNSHARE(3)\fP.
.IP CURL_LOCK_DATA_COOKIE
Cookie data will be shared across the easy handles using this shared object.
Note that this does not activate an easy handle's cookie handling. You can do
that separately by using \fICURLOPT_COOKIEFILE(3)\fP for example.
.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.
Note that due to a known bug, it is not safe to share connections this way
between multiple concurrent threads.
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.
Added in 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.
.SH PROTOCOLS
All
.SH EXAMPLE
.nf
CURLSHcode sh
share = curl_share_init();
sh = curl_share_setopt(share, CURLSHOPT_SHARE, CURL_LOCK_DATA_COOKIE);
if(sh)
printf("Error: %s\\n", curl_share_strerror(sh));
.fi
.SH AVAILABILITY
Added in 7.10
.SH RETURN VALUE
CURLSHE_OK (zero) means that the option was set properly, non-zero means an
error occurred. See \fIlibcurl-errors(3)\fP for the full list with
descriptions.
.SH "SEE ALSO"
.BR CURLSHOPT_UNSHARE "(3), "
.BR curl_share_setopt "(3), " curl_share_cleanup "(3), " curl_share_init "(3)"

69
docs/libcurl/opts/CURLSHOPT_UNLOCKFUNC.3 Normal file
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@ -0,0 +1,69 @@
.\" **************************************************************************
.\" * _ _ ____ _
.\" * Project ___| | | | _ \| |
.\" * / __| | | | |_) | |
.\" * | (__| |_| | _ <| |___
.\" * \___|\___/|_| \_\_____|
.\" *
.\" * Copyright (C) 1998 - 2021, 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.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 CURLSHOPT_UNLOCKFUNC 3 "8 Aug 2003" "libcurl 7.10.7" "libcurl Manual"
.SH NAME
CURLSHOPT_UNLOCKFUNC - mutex unlock callback
.SH SYNOPSIS
.nf
#include <curl/curl.h>
void unlockcb(CURL *handle, curl_lock_data data, curl_lock_access access,
void *userptr);
CURLSHcode curl_share_setopt(CURLSH *share, CURLSHOPT_UNLOCKFUNC, unlockcb);
.fi
.SH DESCRIPTION
Set a mutex unlock callback for the share object. There's a corresponding
\fICURLSHOPT_LOCKFUNC(3)\fP callback called when the mutex is first locked.
The \fIunlockcb\fP argument must be a pointer to a function matching the
prototype shown above. The arguments to the callback are:
\fIhandle\fP is the currently active easy handle in use when the share object
is released.
The \fIdata\fP argument tells what kind of data libcurl wants to unlock. 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 private pointer you set with \fICURLSHOPT_USERDATA\fP.
This pointer is not used by libcurl itself.
.SH PROTOCOLS
All
.SH EXAMPLE
.nf
CURLSHcode sh
share = curl_share_init();
sh = curl_share_setopt(share, CURLSHOPT_UNLOCKFUNC, mutex_unlock);
if(sh)
printf("Error: %s\\n", curl_share_strerror(sh));
.fi
.SH AVAILABILITY
Added in 7.10
.SH RETURN VALUE
CURLSHE_OK (zero) means that the option was set properly, non-zero means an
error occurred. See \fIlibcurl-errors(3)\fP for the full list with
descriptions.
.SH "SEE ALSO"
.BR CURLSHOPT_LOCKFUNC "(3), "
.BR curl_share_setopt "(3), " curl_share_cleanup "(3), " curl_share_init "(3)"

70
docs/libcurl/opts/CURLSHOPT_UNSHARE.3 Normal file
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@ -0,0 +1,70 @@
.\" **************************************************************************
.\" * _ _ ____ _
.\" * Project ___| | | | _ \| |
.\" * / __| | | | |_) | |
.\" * | (__| |_| | _ <| |___
.\" * \___|\___/|_| \_\_____|
.\" *
.\" * Copyright (C) 1998 - 2021, 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.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 CURLSHOPT_UNSHARE 3 "8 Aug 2003" "libcurl 7.10.7" "libcurl Manual"
.SH NAME
CURLSHOPT_UNSHARE - remove data to share
.SH SYNOPSIS
.nf
#include <curl/curl.h>
CURLSHcode curl_share_setopt(CURLSH *share, CURLSHOPT_UNSHARE, long type);
.fi
.SH DESCRIPTION
The \fItype\fP parameter specifies what specific data that should no longer be
shared and kept in the share object that was created with
\fIcurl_share_init(3)\fP. In other words, stop sharing that data in this
shared object. The given \fItype\fP must be be one of the values described
below. You can set \fICURLSHOPT_UNSHARE(3)\fP multiple times with different
data arguments to remove multiple types from the shared object. Add data to
share again with \fICURLSHOPT_SHARE(3)\fP.
.IP CURL_LOCK_DATA_COOKIE
Cookie data will no longer be shared across the easy handles using this shared
object.
.IP CURL_LOCK_DATA_DNS
Cached DNS hosts will be no longer be shared across the easy handles using
this shared object.
.IP CURL_LOCK_DATA_SSL_SESSION
SSL session IDs will no longer be shared across the easy handles using this
shared object.
.IP CURL_LOCK_DATA_CONNECT
The connection cache is no longer shared.
.IP CURL_LOCK_DATA_PSL
The Public Suffix List is no longer shared.
.SH PROTOCOLS
All
.SH EXAMPLE
.nf
CURLSHcode sh
share = curl_share_init();
sh = curl_share_setopt(share, CURLSHOPT_UNSHARE, CURL_LOCK_DATA_COOKIE);
if(sh)
printf("Error: %s\\n", curl_share_strerror(sh));
.fi
.SH AVAILABILITY
Added in 7.10
.SH RETURN VALUE
CURLSHE_OK (zero) means that the option was set properly, non-zero means an
error occurred. See \fIlibcurl-errors(3)\fP for the full list with
descriptions.
.SH "SEE ALSO"
.BR CURLSHOPT_SHARE "(3), "
.BR curl_share_setopt "(3), " curl_share_cleanup "(3), " curl_share_init "(3)"

54
docs/libcurl/opts/CURLSHOPT_USERDATA.3 Normal file
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@ -0,0 +1,54 @@
.\" **************************************************************************
.\" * _ _ ____ _
.\" * Project ___| | | | _ \| |
.\" * / __| | | | |_) | |
.\" * | (__| |_| | _ <| |___
.\" * \___|\___/|_| \_\_____|
.\" *
.\" * Copyright (C) 1998 - 2021, 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.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 CURLSHOPT_USERDATA 3 "8 Aug 2003" "libcurl 7.10.7" "libcurl Manual"
.SH NAME
CURLSHOPT_USERDATA - pointer passed to the (un)lock mutex callbacks
.SH SYNOPSIS
.nf
#include <curl/curl.h>
CURLSHcode curl_share_setopt(CURLSH *share, CURLSHOPT_USERDATA, void *ptr);
.fi
.SH DESCRIPTION
The \fIptr\fP parameter is held verbatim by libcurl and is passed on as the
\fIuserptr\fP argument to the callbacks set with \fICURLSHOPT_LOCKFUNC(3)\fP
and \fICURLSHOPT_LOCKFUNC(3)\fP.
.SH PROTOCOLS
All
.SH EXAMPLE
.nf
CURLSHcode sh
struct secrets private_stuff;
share = curl_share_init();
sh = curl_share_setopt(share, CURLSHOPT_USERDATA, &private_stuff);
if(sh)
printf("Error: %s\\n", curl_share_strerror(sh));
.fi
.SH AVAILABILITY
Added in 7.10
.SH RETURN VALUE
CURLSHE_OK (zero) means that the option was set properly, non-zero means an
error occurred. See \fIlibcurl-errors(3)\fP for the full list with
descriptions.
.SH "SEE ALSO"
.BR CURLSHOPT_LOCKFUNC "(3), "
.BR curl_share_setopt "(3), " curl_share_cleanup "(3), " curl_share_init "(3)"

7
docs/libcurl/opts/Makefile.inc
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@ -399,4 +399,9 @@ man_MANS = \
CURLOPT_WRITEFUNCTION.3 \
CURLOPT_XFERINFODATA.3 \
CURLOPT_XFERINFOFUNCTION.3 \
CURLOPT_XOAUTH2_BEARER.3
CURLOPT_XOAUTH2_BEARER.3 \
CURLSHOPT_LOCKFUNC.3 \
CURLSHOPT_SHARE.3 \
CURLSHOPT_UNLOCKFUNC.3 \
CURLSHOPT_UNSHARE.3 \
CURLSHOPT_USERDATA.3