CURLOPT_IOCTLDATA - Man Page
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 is 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. Deprecated since 7.18.0.
Return Value
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
See Also
Referenced By
curl_easy_setopt(3), CURLOPT_IOCTLFUNCTION(3).
August 22, 2023 ibcurl 8.3.0 libcurl