curlopt_progressfunction(3) [mojave man page]

CURLOPT_PROGRESSFUNCTION(3)				     curl_easy_setopt options				       CURLOPT_PROGRESSFUNCTION(3)

NAME

       CURLOPT_PROGRESSFUNCTION - callback to progress meter function

SYNOPSIS

       #include <curl/curl.h>

       int progress_callback(void *clientp,
			     double dltotal,
			     double dlnow,
			     double ultotal,
			     double ulnow);

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROGRESSFUNCTION, progress_callback);

DESCRIPTION

       Pass a pointer to your callback function, which should match the prototype shown above.

       We encourage users to use the newer CURLOPT_XFERINFOFUNCTION(3) instead, if you can.

       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.

       clientp is the pointer set with CURLOPT_PROGRESSDATA(3), 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. dltotal is the total number of bytes
       libcurl expects to download in this transfer. dlnow is the number of bytes downloaded so far. ultotal is the total number of bytes  libcurl
       expects to upload in this transfer. ulnow 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 CURLE_ABORTED_BY_CALLBACK.

       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.

       CURLOPT_NOPROGRESS(3) must be set to 0 to make this function actually get called.

DEFAULT

       By default, libcurl has an internal progress meter. That's rarely wanted by users.

PROTOCOLS

       All

EXAMPLE

       https://curl.haxx.se/libcurl/c/progressfunc.html

AVAILABILITY

       Always

RETURN VALUE

       Returns CURLE_OK.

SEE ALSO

       CURLOPT_VERBOSE(3), CURLOPT_NOPROGRESS(3),

libcurl 7.54.0							 February 03, 2016				       CURLOPT_PROGRESSFUNCTION(3)

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curl_easy_cleanup(3)						  libcurl Manual					      curl_easy_cleanup(3)

NAME

       curl_easy_cleanup - End a libcurl easy handle

SYNOPSIS

       #include <curl/curl.h>

       void curl_easy_cleanup(CURL *handle);

DESCRIPTION

       This  function  must  be  the  last  function to call for an easy session. It is the opposite of the curl_easy_init(3) function and must be
       called with the same handle as input that a curl_easy_init(3) call returned.

       This might close all connections this handle has used and possibly has kept open until now - unless it was attached to a multi handle while
       doing  the  transfers.  Don't  call  this function if you intend to transfer more files, re-using handles is a key to good performance with
       libcurl.

       Occasionally you may get your progress callback or header callback called from within curl_easy_cleanup(3) (if previously set for the  han-
       dle  using  curl_easy_setopt(3)).  Like	if  libcurl decides to shut down the connection and the protocol is of a kind that requires a com-
       mand/response sequence before disconnect. Examples of such protocols are FTP, POP3 and IMAP.

       Any use of the handle after this function has been called and have returned, is illegal. curl_easy_cleanup(3) kills the handle and all mem-
       ory associated with it!

       For  libcurl versions before 7.17,: after you've called this function, you can safely remove all the strings you've previously told libcurl
       to use, as it won't use them anymore now.

RETURN VALUE

       None

EXAMPLE

       CURL *curl = curl_easy_init();
       if(curl) {
	 CURLcode res;
	 curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
	 res = curl_easy_perform(curl);
	 curl_easy_cleanup(curl);
       }

SEE ALSO

       curl_easy_init(3), curl_easy_duphandle(3), curl_easy_reset(3), curl_multi_cleanup(3), curl_multi_remove_handle(3)

libcurl 7.54.0							 February 03, 2016					      curl_easy_cleanup(3)

Linux and UNIX Man Pages

curlopt_progressfunction(3) [mojave man page]

Check Out this Related Man Page