CURLOPT_IOCTLDATA(3)

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

     static curlioerr ioctl_callback(CURL *handle, int cmd, void *clientp)
     {
       struct data *io = (struct data *)clientp;
       if(cmd == CURLIOCMD_RESTARTREAD) {
         lseek(fd, 0, SEEK_SET);
         current_offset = 0;
         return CURLIOE_OK;
       }
       return CURLIOE_UNKNOWNCMD;
     }
     {
       struct data ioctl_data;
       curl_easy_setopt(curl, CURLOPT_IOCTLFUNCTION, ioctl_callback);
       curl_easy_setopt(curl, CURLOPT_IOCTLDATA, &ioctl_data);
     }

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 7.58.0      Last change: May 31, 2017                   1