table of contents
other versions
- bullseye 7.74.0-1.3+deb11u7
- bullseye-backports 7.88.1-7~bpo11+2
- testing 7.88.1-9
- unstable 7.88.1-10
- experimental 8.0.1-1~exp1
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¶
November 4, 2020 | libcurl 7.74.0 |