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23 .TH CURLOPT_IOCTLDATA 3 "May 31, 2017" "libcurl 7.59.0" "curl_easy_setopt options"
26 CURLOPT_IOCTLDATA \- custom pointer passed to I/O callback
28 #include <curl/curl.h>
30 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_IOCTLDATA, void *pointer);
32 Pass the \fIpointer\fP that will be untouched by libcurl and passed as the 3rd
33 argument in the ioctl callback set with \fICURLOPT_IOCTLFUNCTION(3)\fP.
35 By default, the value of this parameter is NULL.
40 static curlioerr ioctl_callback(CURL *handle, int cmd, void *clientp)
42 struct data *io = (struct data *)clientp;
43 if(cmd == CURLIOCMD_RESTARTREAD) {
44 lseek(fd, 0, SEEK_SET);
48 return CURLIOE_UNKNOWNCMD;
51 struct data ioctl_data;
52 curl_easy_setopt(curl, CURLOPT_IOCTLFUNCTION, ioctl_callback);
53 curl_easy_setopt(curl, CURLOPT_IOCTLDATA, &ioctl_data);
59 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
61 .BR CURLOPT_IOCTLFUNCTION "(3), " CURLOPT_SEEKFUNCTION "(3), "