docs: minor edits to please the new spellchecker regime
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@ -59,4 +59,4 @@ used.
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Doing FTP over an HTTP proxy without --proxytunnel makes curl do HTTP with an
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FTP URL over the proxy. For such transfers, common FTP specific options do not
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work, including --ftp-ssl-reqd and --ftp-ssl-control.
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work, including --ssl-reqd and --ftp-ssl-control.
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@ -24,53 +24,53 @@ displays information about the curl and libcurl installation.
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# OPTIONS
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## --ca
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## `--ca`
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Displays the built-in path to the CA cert bundle this libcurl uses.
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## --cc
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## `--cc`
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Displays the compiler used to build libcurl.
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## --cflags
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## `--cflags`
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Set of compiler options (CFLAGS) to use when compiling files that use
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libcurl. Currently that is only the include path to the curl include files.
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## --checkfor [version]
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## `--checkfor [version]`
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Specify the oldest possible libcurl version string you want, and this script
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returns 0 if the current installation is new enough or it returns 1 and
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outputs a text saying that the current version is not new enough. (Added in
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7.15.4)
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## --configure
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## `--configure`
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Displays the arguments given to configure when building curl.
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## --feature
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## `--feature`
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Lists what particular main features the installed libcurl was built with. At
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the time of writing, this list may include SSL, KRB4 or IPv6. Do not assume
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any particular order. The keywords are separated by newlines. There may be
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none, one, or several keywords in the list.
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## --help
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## `--help`
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Displays the available options.
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## --libs
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## `--libs`
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Shows the complete set of libs and other linker options you need in order to
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link your application with libcurl.
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## --prefix
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## `--prefix`
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This is the prefix used when libcurl was installed. libcurl is then installed
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in $prefix/lib and its header files are installed in $prefix/include and so
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on. The prefix is set with "configure --prefix".
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on. The prefix is set with `configure --prefix`.
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## --protocols
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## `--protocols`
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Lists what particular protocols the installed libcurl was built to support. At
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the time of writing, this list may include HTTP, HTTPS, FTP, FTPS, FILE,
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@ -78,22 +78,22 @@ TELNET, LDAP, DICT and many more. Do not assume any particular order. The
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protocols are listed using uppercase and are separated by newlines. There may
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be none, one, or several protocols in the list. (Added in 7.13.0)
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## --ssl-backends
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## `--ssl-backends`
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Lists the SSL backends that were enabled when libcurl was built. It might be
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no, one or several names. If more than one name, they appear comma-separated.
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(Added in 7.58.0)
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## --static-libs
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## `--static-libs`
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Shows the complete set of libs and other linker options you need in order to
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link your application with libcurl statically. (Added in 7.17.1)
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## --version
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## `--version`
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Outputs version information about the installed libcurl.
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## --vernum
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## `--vernum`
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Outputs version information about the installed libcurl, in numerical mode.
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This shows the version number, in hexadecimal, using 8 bits for each part:
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@ -104,22 +104,21 @@ omitted. (This option was broken in the 7.15.0 release.)
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# EXAMPLES
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What linker options do I need when I link with libcurl?
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~~~
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$ curl-config --libs
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~~~
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$ curl-config --libs
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What compiler options do I need when I compile using libcurl functions?
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~~~
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$ curl-config --cflags
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~~~
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$ curl-config --cflags
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How do I know if libcurl was built with SSL support?
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~~~
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$ curl-config --feature | grep SSL
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~~~
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$ curl-config --feature | grep SSL
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What's the installed libcurl version?
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~~~
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$ curl-config --version
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~~~
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$ curl-config --version
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How do I build a single file with a one-line command?
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~~~
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$ `curl-config --cc --cflags` -o example source.c `curl-config --libs`
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~~~
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$ `curl-config --cc --cflags` -o example source.c `curl-config --libs`
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@ -28,11 +28,10 @@ const struct curl_easyoption *curl_easy_option_by_id(CURLoption id);
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# DESCRIPTION
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Given a *CURLoption* **id**, this function returns a pointer to the
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*curl_easyoption* struct, holding information about the
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curl_easy_setopt(3) option using that id. The option id is the CURLOPT_
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prefix ones provided in the standard curl/curl.h header file. This function
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returns the non-alias version of the cases where there is an alias function as
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well.
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*curl_easyoption* struct, holding information about the curl_easy_setopt(3)
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option using that id. The option id is the `CURLOPT_` prefixed ones provided
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in the standard curl/curl.h header file. This function returns the non-alias
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version of the cases where there is an alias function as well.
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If libcurl has no option with the given id, this function returns NULL.
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@ -27,11 +27,10 @@ const struct curl_easyoption *curl_easy_option_by_name(const char *name);
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# DESCRIPTION
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Given a **name**, this function returns a pointer to the
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*curl_easyoption* struct, holding information about the
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curl_easy_setopt(3) option using that name. The name should be specified
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without the "CURLOPT_" prefix and the name comparison is made case
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insensitive.
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Given a **name**, this function returns a pointer to the *curl_easyoption*
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struct, holding information about the curl_easy_setopt(3) option using that
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name. The name should be specified without the `CURLOPT_` prefix and the name
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comparison is made case insensitive.
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If libcurl has no option with the given name, this function returns NULL.
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@ -316,4 +316,4 @@ filenames are now escaped before transmission.
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# RETURN VALUE
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0 means everything was OK, non-zero means an error occurred corresponding to a
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CURL_FORMADD_* constant defined in *\<curl/curl.h\>*.
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`CURL_FORMADD_*` constant defined in *\<curl/curl.h\>*.
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@ -38,9 +38,9 @@ first argument to the curl_formget_callback function.
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size_t len);"
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~~~
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The curl_formget_callback is invoked for each part of the HTTP POST chain. The
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character buffer passed to the callback must not be freed. The callback should
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return the buffer length passed to it on success.
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The *curl_formget_callback* is invoked for each part of the HTTP POST chain.
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The character buffer passed to the callback must not be freed. The callback
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should return the buffer length passed to it on success.
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If the **CURLFORM_STREAM** option is used in the formpost, it prevents
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curl_formget(3) from working until you have performed the actual HTTP request.
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@ -376,9 +376,8 @@ supports HTTP zstd content encoding using zstd library (Added in 7.72.0)
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*features* mask bit: CURL_VERSION_CONV
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libcurl was built with support for character conversions, as provided by the
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CURLOPT_CONV_* callbacks. Always 0 since 7.82.0. (Added in 7.15.4,
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deprecated.)
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libcurl was built with support for character conversions provided by
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callbacks. Always 0 since 7.82.0. (Added in 7.15.4, deprecated.)
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## no name
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@ -23,16 +23,16 @@ These variables are intended for internal use only, subject to change and have
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many effects on the behavior of libcurl. Refer to the source code to determine
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how exactly they are being used.
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## CURL_ALTSVC_HTTP
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## `CURL_ALTSVC_HTTP`
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Bypass the AltSvc HTTPS protocol restriction if this variable exists.
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## CURL_DBG_SOCK_RBLOCK
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## `CURL_DBG_SOCK_RBLOCK`
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The percentage of recv() calls that should be answered with a EAGAIN at random.
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For TCP/UNIX sockets.
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## CURL_DBG_SOCK_RMAX
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## `CURL_DBG_SOCK_RMAX`
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The maximum data that shall be received from the network in one recv() call.
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For TCP/UNIX sockets. This is applied to every recv.
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@ -40,12 +40,12 @@ For TCP/UNIX sockets. This is applied to every recv.
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Example: **CURL_DBG_SOCK_RMAX=400** means recv buffer size is limited to a
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maximum of 400 bytes.
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## CURL_DBG_SOCK_WBLOCK
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## `CURL_DBG_SOCK_WBLOCK`
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The percentage of send() calls that should be answered with a EAGAIN at random.
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For TCP/UNIX sockets.
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## CURL_DBG_SOCK_WPARTIAL
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## `CURL_DBG_SOCK_WPARTIAL`
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The percentage of data that shall be written to the network. For TCP/UNIX
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sockets. This is applied to every send.
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@ -53,12 +53,12 @@ sockets. This is applied to every send.
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Example: **CURL_DBG_SOCK_WPARTIAL=80** means a send with 1000 bytes would
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only send 800.
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## CURL_DBG_QUIC_WBLOCK
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## `CURL_DBG_QUIC_WBLOCK`
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The percentage of send() calls that should be answered with EAGAIN at random.
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QUIC only.
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## CURL_DEBUG
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## `CURL_DEBUG`
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Trace logging behavior as an alternative to calling curl_global_trace(3).
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@ -73,39 +73,39 @@ Example: **CURL_DEBUG=tcp,-http/2 curl -vv url** means trace protocol details,
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triggered by `-vv`, add tracing of TCP in addition and remove tracing of
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HTTP/2.
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## CURL_DEBUG_SIZE
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## `CURL_DEBUG_SIZE`
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Fake the size returned by CURLINFO_HEADER_SIZE and CURLINFO_REQUEST_SIZE.
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## CURL_GETHOSTNAME
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## `CURL_GETHOSTNAME`
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Fake the local machine's unqualified hostname for NTLM and SMTP.
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## CURL_HSTS_HTTP
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## `CURL_HSTS_HTTP`
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Bypass the HSTS HTTPS protocol restriction if this variable exists.
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## CURL_FORCETIME
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## `CURL_FORCETIME`
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A time of 0 is used for AWS signatures and NTLM if this variable exists.
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## CURL_ENTROPY
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## `CURL_ENTROPY`
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A fixed faked value to use instead of a proper random number so that functions
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in libcurl that are otherwise getting random outputs can be tested for what
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they generate.
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## CURL_SMALLREQSEND
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## `CURL_SMALLREQSEND`
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An alternative size of HTTP data to be sent at a time only if smaller than the
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current.
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## CURL_SMALLSENDS
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## `CURL_SMALLSENDS`
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An alternative size of socket data to be sent at a time only if smaller than
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the current.
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## CURL_TIME
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## `CURL_TIME`
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Fake Unix timestamp to use for AltSvc, HSTS and CURLINFO variables that are
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time related.
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@ -114,34 +114,34 @@ This variable can also be used to fake the data returned by some CURLINFO
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variables that are not time-related (such as CURLINFO_LOCAL_PORT), and in that
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case the value is not a timestamp.
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## CURL_TRACE
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## `CURL_TRACE`
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LDAP tracing is enabled if this variable exists and its value is 1 or greater.
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OpenLDAP tracing is separate. Refer to CURL_OPENLDAP_TRACE.
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## CURL_OPENLDAP_TRACE
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## `CURL_OPENLDAP_TRACE`
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OpenLDAP tracing is enabled if this variable exists and its value is 1 or
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greater. There is a number of debug levels, refer to *openldap.c* comments.
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## CURL_WS_CHUNK_SIZE
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## `CURL_WS_CHUNK_SIZE`
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Used to influence the buffer chunk size used for WebSocket encoding and
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decoding.
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## CURL_WS_CHUNK_EAGAIN
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## `CURL_WS_CHUNK_EAGAIN`
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Used to simulate blocking sends after this chunk size for WebSocket
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connections.
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## CURL_FORBID_REUSE
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## `CURL_FORBID_REUSE`
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Used to set the CURLOPT_FORBID_REUSE flag on each transfer initiated
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by the curl command line tool. The value of the environment variable
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does not matter.
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## CURL_GRACEFUL_SHUTDOWN
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## `CURL_GRACEFUL_SHUTDOWN`
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Make a blocking, graceful shutdown of all remaining connections when
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a multi handle is destroyed. This implicitly triggers for easy handles
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@ -32,7 +32,7 @@ CURLINFO_SCHEME(3) instead, because this option cannot return all
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possible protocols.
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Pass a pointer to a long to receive the version used in the last http
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connection. The returned value is set to one of the CURLPROTO_* values:
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connection. The returned value is set to one of these values:
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~~~c
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CURLPROTO_DICT, CURLPROTO_FILE, CURLPROTO_FTP, CURLPROTO_FTPS,
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@ -58,12 +58,11 @@ struct curl_tlssessioninfo {
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};
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~~~
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The *backend* struct member is one of the defines in the CURLSSLBACKEND_*
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series: CURLSSLBACKEND_NONE (when built without TLS support),
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CURLSSLBACKEND_WOLFSSL, CURLSSLBACKEND_SECURETRANSPORT, CURLSSLBACKEND_GNUTLS,
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CURLSSLBACKEND_MBEDTLS, CURLSSLBACKEND_NSS, CURLSSLBACKEND_OPENSSL or
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CURLSSLBACKEND_SCHANNEL. (Note that the OpenSSL
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forks are all reported as just OpenSSL here.)
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The *backend* struct member is one of these defines: CURLSSLBACKEND_NONE (when
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built without TLS support), CURLSSLBACKEND_WOLFSSL,
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CURLSSLBACKEND_SECURETRANSPORT, CURLSSLBACKEND_GNUTLS, CURLSSLBACKEND_MBEDTLS,
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CURLSSLBACKEND_NSS, CURLSSLBACKEND_OPENSSL or CURLSSLBACKEND_SCHANNEL. (Note
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that the OpenSSL forks are all reported as just OpenSSL here.)
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The *internals* struct member points to a TLS library specific pointer for
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the active ("in use") SSL connection, with the following underlying types:
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@ -28,8 +28,8 @@ CURLcode curl_easy_setopt(CURL *handle, CURLOPT_MIME_OPTIONS, long options);
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# DESCRIPTION
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Pass a long that holds a bitmask of CURLMIMEOPT_* defines. Each bit is a
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Boolean flag used while encoding a MIME tree or multipart form data.
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Pass a long that holds a bitmask of options. Each bit is a boolean flag used
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while encoding a MIME tree or multipart form data.
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Available bits are:
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@ -31,7 +31,7 @@ This option is deprecated. We strongly recommend using
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CURLOPT_PROTOCOLS_STR(3) instead because this option cannot control all
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available protocols.
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Pass a long that holds a bitmask of CURLPROTO_* defines. If used, this bitmask
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Pass a long that holds a bitmask of protocol bits. If used, this bitmask
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limits what protocols libcurl may use in the transfer. This allows you to have
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a libcurl built to support a wide range of protocols but still limit specific
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transfers to only be allowed to use a subset of them. By default libcurl
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@ -32,10 +32,10 @@ This option is deprecated. We strongly recommend using
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CURLOPT_REDIR_PROTOCOLS_STR(3) instead because this option cannot
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control all available protocols.
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Pass a long that holds a bitmask of CURLPROTO_* defines. If used, this bitmask
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Pass a long that holds a bitmask of protocol bits. If used, this bitmask
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limits what protocols libcurl may use in a transfer that it follows to in a
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redirect when CURLOPT_FOLLOWLOCATION(3) is enabled. This allows you to
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limit specific transfers to only be allowed to use a subset of protocols in
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redirect when CURLOPT_FOLLOWLOCATION(3) is enabled. This allows you to limit
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specific transfers to only be allowed to use a subset of protocols in
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redirections.
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Protocols denied by CURLOPT_PROTOCOLS(3) are not overridden by this
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@ -71,7 +71,7 @@ int main(void)
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~~~
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If you are on Linux and somehow have a need for paths larger than 107 bytes,
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you can use the proc filesystem to bypass the limitation:
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you can use the *proc* filesystem to bypass the limitation:
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~~~c
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int dirfd = open(long_directory_path_to_socket, O_DIRECTORY | O_RDONLY);
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@ -81,9 +81,8 @@ int main(void)
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# HISTORY
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This option was known as CURLOPT_FTP_SSL up to 7.16.4, and the constants were
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known as CURLFTPSSL_* Handled by LDAP since 7.81.0. Fully supported by the
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OpenLDAP backend only.
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This option was known as CURLOPT_FTP_SSL up to 7.16.4. Supported by LDAP since
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7.81.0. Fully supported by the OpenLDAP backend only.
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# %AVAILABILITY%
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@ -51,7 +51,7 @@ stdout
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A common technique is to use the write callback to store the incoming data
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into a dynamically growing allocated buffer, and then this
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CURLOPT_WRITEDATA(3) is used to point to a struct or the buffer to store data
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in. Like in the getinmemory example:
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in. Like in the *getinmemory* example:
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https://curl.se/libcurl/c/getinmemory.html
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# HISTORY
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