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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 7.65.3 May 31, 2017 CURLOPT_IOCTLDATA(3)

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