curlopt_ioctldata(3) [mojave man page]

CURLOPT_IOCTLDATA(3)					     curl_easy_setopt options					      CURLOPT_IOCTLDATA(3)

NAME

       CURLOPT_IOCTLDATA - custom pointer passed to I/O callback

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_IOCTLDATA, void *pointer);

DESCRIPTION

       Pass the pointer that will be untouched by libcurl and passed as the 3rd argument in the ioctl callback set with CURLOPT_IOCTLFUNCTION(3).

DEFAULT

       By default, the value of this parameter is NULL.

PROTOCOLS

       Used with HTTP

EXAMPLE

       TODO

AVAILABILITY

       Added in 7.12.3

RETURN VALUE

       Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

SEE ALSO

       CURLOPT_IOCTLFUNCTION(3), CURLOPT_SEEKFUNCTION(3),

libcurl 7.54.0							 February 03, 2016					      CURLOPT_IOCTLDATA(3)

CURLOPT_SEEKFUNCTION(3) 				     curl_easy_setopt options					   CURLOPT_SEEKFUNCTION(3)

NAME

       CURLOPT_SEEKFUNCTION - user callback for seeking in input stream

SYNOPSIS

       #include <curl/curl.h>

       /* These are the return codes for the seek callbacks */
       #define CURL_SEEKFUNC_OK       0
       #define CURL_SEEKFUNC_FAIL     1 /* fail the entire transfer */
       #define CURL_SEEKFUNC_CANTSEEK 2 /* tell libcurl seeking can't be done, so
					   libcurl might try other means instead */

       int seek_callback(void *userp, curl_off_t offset, int origin);

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SEEKFUNCTION, seek_callback);

DESCRIPTION

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

       This  function gets called by libcurl to seek to a certain position in the input stream and can be used to fast forward a file in a resumed
       upload (instead of reading all uploaded bytes with the normal read function/callback). It is also called to rewind a stream when  data  has
       already	been sent to the server and needs to be sent again. This may happen when doing a HTTP PUT or POST with a multi-pass authentication
       method, or when an existing HTTP connection is reused too late and the server closes the connection. The function shall work like  fseek(3)
       or lseek(3) and it gets SEEK_SET, SEEK_CUR or SEEK_END as argument for origin, although libcurl currently only passes SEEK_SET.

       userp is the pointer you set with CURLOPT_SEEKDATA(3).

       The  callback  function	must  return  CURL_SEEKFUNC_OK	on success, CURL_SEEKFUNC_FAIL to cause the upload operation to fail or CURL_SEEK-
       FUNC_CANTSEEK to indicate that while the seek failed, libcurl is free to work around the problem if possible. The latter can  sometimes	be
       done by instead reading from the input or similar.

       If  you	forward  the  input  arguments directly to fseek(3) or lseek(3), note that the data type for offset is not the same as defined for
       curl_off_t on many systems!

DEFAULT

       By default, this is NULL and unused.

PROTOCOLS

       HTTP, FTP, SFTP

EXAMPLE

       TODO

AVAILABILITY

       Added in 7.18.0

RETURN VALUE

       Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

SEE ALSO

       CURLOPT_SEEKDATA(3), CURLOPT_IOCTLFUNCTION(3),

libcurl 7.54.0							 February 03, 2016					   CURLOPT_SEEKFUNCTION(3)