2000-05-22 21:02:54 +02:00
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.\" You can view this file with:
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.\" nroff -man [file]
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2000-06-20 17:31:26 +02:00
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.\" Written by daniel@haxx.se
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2000-05-22 21:02:54 +02:00
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.\"
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2000-11-07 00:11:23 +01:00
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.TH curl_easy_setopt 3 "30 October 2000" "Curl 7.4.2" "libcurl Manual"
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2000-05-22 21:02:54 +02:00
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.SH NAME
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curl_easy_setopt - Set curl easy-session options
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.SH SYNOPSIS
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.B #include <curl/easy.h>
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.sp
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.BI "CURLcode curl_easy_setopt(CURL *" handle ", CURLoption "option ", ...);
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.ad
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.SH DESCRIPTION
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curl_easy_setopt() is called to tell libcurl how to behave in a number of
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ways. Most operations in libcurl have default actions, and by using the
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appropriate options you can make them behave differently (as documented). All
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options are set with the
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.I option
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followed by a parameter. That parameter can be a long, a function pointer or
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an object pointer, all depending on what the option in question expects. Read
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this manual carefully as bad input values may cause libcurl to behave badly!
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2000-08-24 16:28:48 +02:00
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You can only set one option in each function call. A typical application uses
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many calls in the setup phase.
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The
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.I "handle"
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is the return code from the
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.I "curl_easy_init"
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call.
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.SH OPTIONS
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These options are in a bit of random order, but you'll figure it out!
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.TP 0.8i
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.B CURLOPT_FILE
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Data pointer to pass instead of FILE * to the file write function. Note that
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if you specify the
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.I CURLOPT_WRITEFUNCTION
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, this is the pointer you'll get as input.
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.TP
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.B CURLOPT_WRITEFUNCTION
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Function pointer that should use match the following prototype:
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.BI "size_t function( void *ptr, size_t size, size_t nmemb, FILE *stream);"
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This function gets called by libcurl as soon as there is received data that
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needs to be written down. The size of the data pointed to by
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.I ptr
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is
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.I size
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multiplied with
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.I nmemb.
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Return the number of bytes actually written or return -1 to signal error to the library (it will cause it to abort the transfer).
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.TP
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.B CURLOPT_INFILE
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Data pointer to pass instead of FILE * to the file read function. Note that if
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you specify the
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.I CURLOPT_READFUNCTION
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, this is the pointer you'll get as input.
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.TP
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.B CURLOPT_READFUNCTION
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Function pointer that should use match the following prototype:
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.BI "size_t function( void *ptr, size_t size, size_t nmemb, FILE *stream);"
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This function gets called by libcurl as soon as it needs to read data in order
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to send it to the peer. The data area pointed at by the pointer
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.I ptr
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may be filled with at most
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.I size
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multiplied with
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.I nmemb
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number of bytes. Your function must return the actual number of bytes that you
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stored in that memory area. Returning -1 will signal an error to the library
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and cause it to abort the current transfer immediately.
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.TP
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.B CURLOPT_INFILESIZE
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When uploading a file to a remote site, this option should be used to tell
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libcurl what the expected size of the infile is.
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.TP
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.B CURLOPT_URL
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The actual URL to deal with. The parameter should be a char * to a zero
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terminated string. NOTE: this option is currently required!
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.TP
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.B CURLOPT_PROXY
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If you need libcurl to use a http proxy to access the outside world, set the
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proxy string with this option. The parameter should be a char * to a zero
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terminated string. To specify port number in this string, append":[port]" to
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the end of the host name. The proxy string may be prefixed with
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"[protocol]://" since any such prefix will be ignored.
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.TP
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.B CURLOPT_PROXYPORT
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Set this long with this option to set the proxy port to use unless it is
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specified in the proxy string CURLOPT_PROXY.
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.TP
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.B CURLOPT_HTTPPROXYTUNNEL
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Set the parameter to non-zero to get the library to tunnel all non-HTTP
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operations through the given HTTP proxy. Do note that there is a big
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difference to use a proxy and to tunnel through it. If you don't know what
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this means, you probably don't want this tunnel option. (Added in libcurl 7.3)
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.TP
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.B CURLOPT_VERBOSE
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Set the parameter to non-zero to get the library to display a lot of verbose
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information about its operations.
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.TP
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.B CURLOPT_HEADER
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A non-zero parameter tells the library to include the header in the
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output. This is only relevant for protocols that actually has a header
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preceeding the data (like HTTP).
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.TP
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.B CURLOPT_NOPROGRESS
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A non-zero parameter tells the library to shut of the built-in progress meter
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completely. (NOTE: future versions of the lib is likely to not have any
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built-in progress meter at all).
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.TP
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.B CURLOPT_NOBODY
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A non-zero parameter tells the library to not include the body-part in the
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output. This is only relevant for protocols that have a separate header and
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body part.
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.TP
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.B CURLOPT_FAILONERROR
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A non-zero parameter tells the library to fail silently if the HTTP code
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returned is equal or larger than 300. The default action would be to return
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the page normally, ignoring that code.
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.TP
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.B CURLOPT_UPLOAD
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A non-zero parameter tells the library to prepare for an upload. The
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CURLOPT_INFILE and CURLOPT_INFILESIZE are also interesting for uploads.
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.TP
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.B CURLOPT_POST
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A non-zero parameter tells the library to do a regular HTTP post. This is a
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normal application/x-www-form-urlencoded kind, which is the most commonly used
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one by HTML forms. See the CURLOPT_POSTFIELDS option for how to specify the
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data to post and CURLOPT_POSTFIELDSIZE in how to set the data size.
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.TP
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.B CURLOPT_FTPLISTONLY
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A non-zero parameter tells the library to just list the names of an ftp
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directory, instead of doing a full directory listin that would include file
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sizes, dates etc.
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.TP
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.B CURLOPT_FTPAPPEND
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A non-zero parameter tells the library to append to the remote file instead of
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overwrite it. This is only useful when uploading to a ftp site.
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.TP
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.B CURLOPT_NETRC
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A non-zero parameter tells the library to scan your
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.I ~/.netrc
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file to find user name and password for the remote site you are about to
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access. Do note that curl does not verify that the file has the correct
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properties set (as the standard unix ftp client does), and that only machine
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name, user name and password is taken into account (init macros and similar
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things aren't supported).
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.TP
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.B CURLOPT_FOLLOWLOCATION
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A non-zero parameter tells the library to follow any Location: header that the
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server sends as part of a HTTP header. NOTE that this means that the library
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will resend the same request on the new location and follow new Location:
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headers all the way until no more such headers are returned.
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.TP
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.B CURLOPT_TRANSFERTEXT
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A non-zero parameter tells the library to use ASCII mode for ftp transfers,
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instead of the default binary transfer. For LDAP transfers it gets the data in
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plain text instead of HTML and for win32 systems it does not set the stdout to
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binary mode. This option can be useable when transfering text data between
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system with different views on certain characters, such as newlines or
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similar.
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.TP
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.B CURLOPT_PUT
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A non-zero parameter tells the library to use HTTP PUT a file. The file to put
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must be set with CURLOPT_INFILE and CURLOPT_INFILESIZE.
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.TP
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.B CURLOPT_MUTE
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A non-zero parameter tells the library to be completely quiet.
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.TP
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.B CURLOPT_USERPWD
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Pass a char * as parameter, which should be [username]:[password] to use for
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the connection. If the password is left out, you will be prompted for it.
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.TP
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.B CURLOPT_PROXYUSERPWD
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Pass a char * as parameter, which should be [username]:[password] to use for
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the connection to the HTTP proxy. If the password is left out, you will be
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prompted for it.
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.TP
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.B CURLOPT_RANGE
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Pass a char * as parameter, which should contain the specified range you
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want. It should be in the format "X-Y", where X or Y may be left out. The HTTP
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transfers also support several intervals, separated with commas as in
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.I "X-Y,N-M".
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.TP
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.B CURLOPT_ERRORBUFFER
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Pass a char * to a buffer that the libcurl may store human readable error
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messages in. This may be more helpful than just the return code from the
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library. The buffer must be at least CURL_ERROR_SIZE big.
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.TP
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.B CURLOPT_TIMEOUT
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Pass a long as parameter containing the maximum time in seconds that you allow
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the libcurl transfer operation to take. Do note that normally, name lookups
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maky take a considerable time and that limiting the operation to less than a
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few minutes risk aborting perfectly normal operations.
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.TP
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.B CURLOPT_POSTFIELDS
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Pass a char * as parameter, which should be the full data to post in a HTTP
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post operation. See also the CURLOPT_POST.
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.TP
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.B CURLOPT_POSTFIELDSIZE
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If you want to post data to the server without letting libcurl do a strlen()
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to measure the data size, this option must be used. Also, when this option is
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used, you can post fully binary data which otherwise is likely to fail. If
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2000-09-15 16:15:47 +02:00
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this size is set to zero, the library will use strlen() to get the data
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size. (Added in libcurl 7.2)
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.TP
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.B CURLOPT_REFERER
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Pass a pointer to a zero terminated string as parameter. It will be used to
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set the referer: header in the http request sent to the remote server. This
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can be used to fool servers or scripts.
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.TP
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.B CURLOPT_USERAGENT
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Pass a pointer to a zero terminated string as parameter. It will be used to
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set the user-agent: header in the http request sent to the remote server. This
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can be used to fool servers or scripts.
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.TP
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.B CURLOPT_FTPPORT
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Pass a pointer to a zero terminated string as parameter. It will be used to
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get the IP address to use for the ftp PORT instruction. The PORT instruction
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tells the remote server to connect to our specified IP address. The string may
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be a plain IP address, a host name, an network interface name (under unix) or
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just a '-' letter to let the library use your systems default IP address.
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.TP
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.B CURLOPT_LOW_SPEED_LIMIT
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Pass a long as parameter. It contains the transfer speed in bytes per second
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that the transfer should be below during CURLOPT_LOW_SPEED_TIME seconds for
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the library to consider it too slow and abort.
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.TP
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.B CURLOPT_LOW_SPEED_TIME
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Pass a long as parameter. It contains the time in seconds that the transfer
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should be below the CURLOPT_LOW_SPEED_LIMIT for the library to consider it too
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slow and abort.
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.TP
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.B CURLOPT_RESUME_FROM
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Pass a long as parameter. It contains the offset in number of bytes that you
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want the transfer to start from.
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.TP
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.B CURLOPT_COOKIE
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Pass a pointer to a zero terminated string as parameter. It will be used to
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set a cookie in the http request. The format of the string should be
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'[NAME]=[CONTENTS];' Where NAME is the cookie name.
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.TP
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.B CURLOPT_HTTPHEADER
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Pass a pointer to a linked list of HTTP headers to pass to the server in your
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HTTP request. The linked list should be a fully valid list of 'struct
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2000-06-02 13:31:53 +02:00
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curl_slist' structs properly filled in. Use
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.I curl_slist_append(3)
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to create the list and
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.I curl_slist_free_all(3)
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to clean up an entire list.
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2000-05-26 10:50:13 +02:00
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.TP
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.B CURLOPT_HTTPPOST
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Tells libcurl you want a multipart/formdata HTTP POST to be made and you
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instruct what data to pass on to the server. Pass a pointer to a linked list
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of HTTP post structs as parameter. The linked list should be a fully valid
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list of 'struct HttpPost' structs properly filled in. The best and most
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elegant way to do this, is to use
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.I curl_formparse(3)
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as documented.
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2000-05-26 10:50:13 +02:00
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.TP
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.B CURLOPT_SSLCERT
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Pass a pointer to a zero terminated string as parameter. The string should be
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the file name of your certficicate in PEM format.
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.TP
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.B CURLOPT_SSLCERTPASSWD
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Pass a pointer to a zero terminated string as parameter. It will be used as
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the password required to use the CURLOPT_SSLCERT certificate. If the password
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is not supplied, you will be prompted for it.
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.TP
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.B CURLOPT_CRLF
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TBD.
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.TP
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.B CURLOPT_QUOTE
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Pass a pointer to a linked list of FTP commands to pass to the server prior to
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your ftp request. The linked list should be a fully valid list of 'struct
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2000-06-02 14:06:47 +02:00
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curl_slist' structs properly filled in. Use
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.I curl_slist_append(3)
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to append strings (commands) to the list, and clear the entire list afterwards
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with
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.I curl_slist_free_all(3)
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2000-05-26 10:50:13 +02:00
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.TP
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.B CURLOPT_POSTQUOTE
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Pass a pointer to a linked list of FTP commands to pass to the server after
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your ftp transfer request. The linked list should be a fully valid list of
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2000-06-02 14:06:47 +02:00
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struct curl_slist structs properly filled in as described for
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.I "CURLOPT_QUOTE"
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2000-05-26 10:50:13 +02:00
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.TP
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.B CURLOPT_WRITEHEADER
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Pass a FILE * to be used to write the header part of the received data to.
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.TP
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.B CURLOPT_COOKIEFILE
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Pass a pointer to a zero terminated string as parameter. It should contain the
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name of your file holding cookie data. The cookie data may be in netscape
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cookie data format or just regular HTTP-style headers dumped to a file.
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.TP
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.B CURLOPT_SSLVERSION
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Pass a long as parameter. Set what version of SSL to attempt to use, 2 or
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3. By default, the SSL library will try to solve this by itself although some
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servers make this difficult why you at times will have to use this option.
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.TP
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.B CURLOPT_TIMECONDITION
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Pass a long as parameter. This defines how the CURLOPT_TIMEVALUE time value is
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treated. You can set this parameter to TIMECOND_IFMODSINCE or
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TIMECOND_IFUNMODSINCE. This is aa HTTP-only feature. (TBD)
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.TP
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.B CURLOPT_TIMEVALUE
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Pass a long as parameter. This should be the time in seconds since 1 jan 1970,
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and the time will be used as specified in CURLOPT_TIMECONDITION or if that
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isn't used, it will be TIMECOND_IFMODSINCE by default.
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.TP
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.B CURLOPT_CUSTOMREQUEST
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Pass a pointer to a zero terminated string as parameter. It will be user
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instead of GET or HEAD when doing the HTTP request. This is useful for doing
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|
DELETE or other more obscure HTTP requests. Don't do this at will, make sure
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|
|
your server supports the command first.
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|
|
.TP
|
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|
|
.B CURLOPT_STDERR
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|
Pass a FILE * as parameter. This is the stream to use instead of stderr
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|
|
internally when reporting errors.
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|
.TP
|
2000-09-27 00:30:23 +02:00
|
|
|
.B CURLOPT_INTERFACE
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|
Pass a char * as parameter. This set the interface name to use as outgoing
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|
|
network interface. The name can be an interface name, an IP address or a host
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|
name. (Added in libcurl 7.3)
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|
.TP
|
|
|
|
.B CURLOPT_KRB4LEVEL
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|
|
Pass a char * as parameter. Set the krb4 security level, this also enables
|
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|
|
krb4 awareness. This is a string, 'clear', 'safe', 'confidential' or
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|
'private'. If the string is set but doesn't match one of these, 'private'
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|
|
will be used. Set the string to NULL to disable kerberos4. The kerberos
|
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|
|
support only works for FTP. (Added in libcurl 7.3)
|
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|
|
.TP
|
2000-05-26 10:50:13 +02:00
|
|
|
.B CURLOPT_WRITEINFO
|
2000-10-04 00:06:26 +02:00
|
|
|
(NOT PRESENT IN 7.4 or later!)
|
2000-05-26 10:50:13 +02:00
|
|
|
Pass a pointer to a zero terminated string as parameter. It will be used to
|
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|
|
report information after a successful request. This string may contain
|
|
|
|
variables that will be substituted by their contents when output. Described
|
|
|
|
elsewhere.
|
2000-06-08 17:13:41 +02:00
|
|
|
.TP
|
|
|
|
.B CURLOPT_PROGRESSFUNCTION
|
|
|
|
Function pointer that should match the
|
|
|
|
.BI curl_progress_callback
|
|
|
|
prototype found in
|
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|
|
.I <curl/curl.h>
|
|
|
|
This function gets called by libcurl instead of its internal
|
|
|
|
equivalent. Unknown/unused argument values will be set to zero (like if you
|
|
|
|
only download data, the upload size will remain 0). Returning a non-zero value
|
|
|
|
from this callback will cause libcurl to abort the transfer and return
|
|
|
|
CURLE_ABORTED_BY_CALLBACK.
|
|
|
|
.TP
|
|
|
|
.B CURLOPT_PROGRESSDATA
|
|
|
|
Pass a pointer that will be untouched by libcurl and passed as the first
|
|
|
|
argument in the progress callback set with
|
|
|
|
.I CURLOPT_PROGRESSFUNCTION
|
|
|
|
.
|
2000-11-07 00:11:23 +01:00
|
|
|
.TP
|
|
|
|
.B CURLOPT_SSL_VERIFYPEER
|
|
|
|
Pass a long that is set to a non-zero value to make curl verify the peer's
|
|
|
|
certificate. The certificate to verify against must be specified with the
|
|
|
|
CURLOPT_CAINFO option. (Added in 7.4.2)
|
|
|
|
.TP
|
|
|
|
.B CURLOPT_CAINFO
|
|
|
|
Pass a char * to a zero terminated file naming holding the certificate to
|
|
|
|
verify the peer with. This only makes sense when used in combination with the
|
|
|
|
CURLOPT_SSL_VERIFYPEER option. (Added in 7.4.2)
|
|
|
|
.TP
|
|
|
|
.B CURLOPT_PASSWDFUNCTION
|
|
|
|
Pass a pointer to a curl_passwd_callback function that will then be called
|
|
|
|
instead of the internal one if libcurl requests a password. The function must
|
|
|
|
match this prototype:
|
|
|
|
.BI "int my_getpass(void *client, char *prompt, char* buffer, int buflen );"
|
|
|
|
If set to NULL, it equals to making the function always fail. If the function
|
|
|
|
returns a non-zero value, it will abort the operation and an error
|
|
|
|
(CURLE_BAD_PASSWORD_ENTERED) will be returned.
|
|
|
|
.I client
|
|
|
|
is a generic pointer, see CURLOPT_PASSWDDATA.
|
|
|
|
.I prompt
|
|
|
|
is a zero-terminated string that is text that prefixes the input request.
|
|
|
|
.I buffer
|
|
|
|
is a pointer to data where the entered password should be stored and
|
|
|
|
.I buflen
|
|
|
|
is the maximum number of bytes that may be written in the buffer.
|
|
|
|
(Added in 7.4.2)
|
|
|
|
.TP
|
|
|
|
.B CURLOPT_PASSWDDATA
|
|
|
|
Pass a void * to whatever data you want. The passed pointer will be the first
|
|
|
|
argument sent to the specifed CURLOPT_PASSWDFUNCTION function. (Added in
|
|
|
|
7.4.2)
|
2000-05-22 21:02:54 +02:00
|
|
|
.PP
|
|
|
|
.SH RETURN VALUE
|
|
|
|
0 means the option was set properly, non-zero means an error as
|
|
|
|
.I <curl/curl.h>
|
|
|
|
defines
|
|
|
|
.SH "SEE ALSO"
|
|
|
|
.BR curl_easy_init "(3), " curl_easy_cleanup "(3), "
|
|
|
|
.SH BUGS
|
|
|
|
Surely there are some, you tell me!
|