CURLOPT_IOCTLDATA(3)

1CURLOPT_IOCTLDATA(3)                libcurl               CURLOPT_IOCTLDATA(3)
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NAME

6       CURLOPT_IOCTLDATA - pointer passed to I/O callback
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SYNOPSIS

9       #include <curl/curl.h>
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11       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_IOCTLDATA, void *pointer);
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DESCRIPTION

14       Pass  the  pointer  that will be untouched by libcurl and passed as the
15       3rd argument in the ioctl callback set with CURLOPT_IOCTLFUNCTION(3).
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DEFAULT

18       By default, the value of this parameter is NULL.
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PROTOCOLS

21       Used with HTTP
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EXAMPLE

24       static curlioerr ioctl_callback(CURL *handle, int cmd, void *clientp)
25       {
26         struct data *io = (struct data *)clientp;
27         if(cmd == CURLIOCMD_RESTARTREAD) {
28           lseek(fd, 0, SEEK_SET);
29           current_offset = 0;
30           return CURLIOE_OK;
31         }
32         return CURLIOE_UNKNOWNCMD;
33       }
34       {
35         struct data ioctl_data;
36         curl_easy_setopt(curl, CURLOPT_IOCTLFUNCTION, ioctl_callback);
37         curl_easy_setopt(curl, CURLOPT_IOCTLDATA, &ioctl_data);
38       }
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AVAILABILITY

41       Added in 7.12.3. Deprecated since 7.18.0.
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RETURN VALUE

44       Returns CURLE_OK if the option is supported,  and  CURLE_UNKNOWN_OPTION
45       if not.
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