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opts: 3 more options as man pages

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Daniel Stenberg 2014-06-17 16:48:16 +02:00
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89
docs/libcurl/opts/CURLOPT_HEADERFUNCTION.3 Normal file
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.\" **************************************************************************
.\" * _ _ ____ _
.\" * Project ___| | | | _ \| |
.\" * / __| | | | |_) | |
.\" * | (__| |_| | _ <| |___
.\" * \___|\___/|_| \_\_____|
.\" *
.\" * Copyright (C) 1998 - 2014, 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 http://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 CURLOPT_HEADERFUNCTION 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
.SH NAME
CURLOPT_HEADERFUNCTION \- callback that receives header data
.SH SYNOPSIS
#include <curl/curl.h>
size_t header_callback(char *buffer,
size_t size,
size_t nitems,
void *userdata);
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HEADERFUNCTION, header_callback);
.SH DESCRIPTION
Pass a pointer to your callback function, which should match the prototype
shown above.
This function gets called by libcurl as soon as it has received header
data. The header callback will be called once for each header and only
complete header lines are passed on to the callback. Parsing headers is very
easy using this. The size of the data pointed to by \fIptr\fP is \fIsize\fP
multiplied with \fInmemb\fP. Do not assume that the header line is zero
terminated! The pointer named \fIuserdata\fP is the one you set with the
\fICURLOPT_HEADERDATA(3)\fP option. This callback function must return the
number of bytes actually taken care of. If that amount differs from the amount
passed in to your function, it'll signal an error to the library. This will
cause the transfer to get aborted and the libcurl function in progress will
return \fICURL_WRITE_ERROR\fP.
A complete HTTP header that is passed to this function can be up to
\fICURL_MAX_HTTP_HEADER\fP (100K) bytes.
If this option is not set, or if it is set to NULL, but
\fICURLOPT_HEADERDATA(3)\fP is set to anything but NULL, the function used to
accept response data will be used instead. That is, it will be the function
specified with \fICURLOPT_WRITEFUNCTION(3)\fP, or if it is not specified or
NULL - the default, stream-writing function.
It's important to note that the callback will be invoked for the headers of
all responses received after initiating a request and not just the final
response. This includes all responses which occur during authentication
negotiation. If you need to operate on only the headers from the final
response, you will need to collect headers in the callback yourself and use
HTTP status lines, for example, to delimit response boundaries.
When a server sends a chunked encoded transfer, it may contain a trailer. That
trailer is identical to a HTTP header and if such a trailer is received it is
passed to the application using this callback as well. There are several ways
to detect it being a trailer and not an ordinary header: 1) it comes after the
response-body. 2) it comes after the final header line (CR LF) 3) a Trailer:
header among the regular response-headers mention what header(s) to expect in
the trailer.
For non-HTTP protocols like FTP, POP3, IMAP and SMTP this function will get
called with the server responses to the commands that libcurl sends.
.SH DEFAULT
Nothing.
.SH PROTOCOLS
Used for all protocols with headers or meta-data concept: HTTP, FTP, POP3,
IMAP, SMTP and more.
.SH EXAMPLE
TODO
.SH AVAILABILITY
Always
.SH RETURN VALUE
Returns CURLE_OK
.SH "SEE ALSO"
.BR CURLOPT_HEADERDATA "(3), " CURLOPT_WRITEFUNCTION "(3), "

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docs/libcurl/opts/CURLOPT_XFERINFODATA.3 Normal file
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.\" **************************************************************************
.\" * _ _ ____ _
.\" * Project ___| | | | _ \| |
.\" * / __| | | | |_) | |
.\" * | (__| |_| | _ <| |___
.\" * \___|\___/|_| \_\_____|
.\" *
.\" * Copyright (C) 1998 - 2014, 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 http://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 CURLOPT_XFERINFODATA 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
.SH NAME
CURLOPT_XFERINFODATA \- custom pointer passed to the progress callback
.SH SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_XFERINFODATA, void *pointer);
.SH DESCRIPTION
Pass a \fIpointer\fP that will be untouched by libcurl and passed as the first
argument in the progress callback set with \fICURLOPT_XFERINFOFUNCTION(3)\fP.
This is an alias for \fICURLOPT_PROGRESSDATA(3)\fP.
.SH DEFAULT
The default value of this parameter is NULL.
.SH PROTOCOLS
All
.SH EXAMPLE
http://curl.haxx.se/libcurl/c/progressfunc.html
.SH AVAILABILITY
Added in 7.32.0
.SH RETURN VALUE
Returns CURLE_OK
.SH "SEE ALSO"
.BR CURLOPT_XFERINFOFUNCTION "(3), " CURLOPT_XFERINFOFUNCTION "(3), "

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docs/libcurl/opts/CURLOPT_XFERINFOFUNCTION.3 Normal file
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.\" **************************************************************************
.\" * _ _ ____ _
.\" * Project ___| | | | _ \| |
.\" * / __| | | | |_) | |
.\" * | (__| |_| | _ <| |___
.\" * \___|\___/|_| \_\_____|
.\" *
.\" * Copyright (C) 1998 - 2014, 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 http://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 CURLOPT_XFERINFOFUNCTION 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
.SH NAME
CURLOPT_XFERINFOFUNCTION \- callback to progress meter function
.SH SYNOPSIS
#include <curl/curl.h>
int progress_callback(void *clientp,
curl_off_t dltotal,
curl_off_t dlnow,
curl_off_t ultotal,
curl_off_t ulnow);
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_XFERINFOFUNCTION, progress_callback);
.SH DESCRIPTION
Pass a pointer to your callback function, which should match the prototype
shown above.
This function gets called by libcurl instead of its internal equivalent with a
frequent interval. While data is being transferred it will be called very
frequently, and during slow periods like when nothing is being transferred it
can slow down to about one call per second.
\fIclientp\fP is the pointer set with \fICURLOPT_XFERINFODATA(3)\fP, it is not
used by libcurl but is only passed along from the application to the callback.
The callback gets told how much data libcurl will transfer and has
transferred, in number of bytes. \fIdltotal\fP is the total number of bytes
libcurl expects to download in this transfer. \fIdlnow\fP is the number of
bytes downloaded so far. \fIultotal\fP is the total number of bytes libcurl
expects to upload in this transfer. \fIulnow\fP is the number of bytes
uploaded so far.
Unknown/unused argument values passed to the callback will be set to zero
(like if you only download data, the upload size will remain 0). Many times
the callback will be called one or more times first, before it knows the data
sizes so a program must be made to handle that.
Returning a non-zero value from this callback will cause libcurl to abort the
transfer and return \fICURLE_ABORTED_BY_CALLBACK\fP.
If you transfer data with the multi interface, this function will not be
called during periods of idleness unless you call the appropriate libcurl
function that performs transfers.
\fICURLOPT_NOPROGRESS(3)\fP must be set to 0 to make this function actually
get called.
.SH DEFAULT
By default, libcurl has an internal progress meter. That's rarely wanted by
users.
.SH PROTOCOLS
All
.SH EXAMPLE
http://curl.haxx.se/libcurl/c/progressfunc.html
.SH AVAILABILITY
Added in 7.32.0. This callback replaces \fICURLOPT_PROGRESSFUNCTION(3)\fP
.SH RETURN VALUE
Returns CURLE_OK.
.SH "SEE ALSO"
.BR CURLOPT_XFERINFODATA "(3), " CURLOPT_NOPROGRESS "(3), "