CURLOPT_IOCTLDATA explained
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 is untouched by libcurl and passed as the 3rd argument in the ioctl callback set with CURLOPT_IOCTLFUNCTION.
Default
NULL
Protocols
This functionality affects all supported protocols
Example
#include <unistd.h> /* for lseek */ struct data { int fd; /* our file descriptor */ }; static curlioerr ioctl_callback(CURL *handle, int cmd, void *clientp) { struct data *io = (struct data *)clientp; if(cmd == CURLIOCMD_RESTARTREAD) { lseek(io->fd, 0, SEEK_SET); return CURLIOE_OK; } return CURLIOE_UNKNOWNCMD; } int main(void) { struct data ioctl_data; CURL *curl = curl_easy_init(); if(curl) { curl_easy_setopt(curl, CURLOPT_IOCTLFUNCTION, ioctl_callback); curl_easy_setopt(curl, CURLOPT_IOCTLDATA, &ioctl_data); } }
Deprecated
Deprecated since 7.18.0.
Availability
Added in curl 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)
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