CURLOPT_IOCTLDATA(3) curl_easy_setopt options CURLOPT_IOCTLDATA(3)
NAME
CURLOPT_IOCTLDATA - 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 7.81.0 November 26, 2021 CURLOPT_IOCTLDATA(3)
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