73 lines
1.3 KiB
Markdown
73 lines
1.3 KiB
Markdown
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---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_IOCTLDATA
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_IOCTLFUNCTION (3)
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- CURLOPT_SEEKFUNCTION (3)
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---
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# NAME
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CURLOPT_IOCTLDATA - pointer passed to I/O callback
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_IOCTLDATA, void *pointer);
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~~~
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# DESCRIPTION
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Pass the *pointer* that is untouched by libcurl and passed as the 3rd
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argument in the ioctl callback set with CURLOPT_IOCTLFUNCTION(3).
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# DEFAULT
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By default, the value of this parameter is NULL.
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# PROTOCOLS
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Used with HTTP
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# EXAMPLE
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~~~c
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#include <unistd.h> /* for lseek */
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struct data {
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int fd; /* our file descriptor */
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};
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static curlioerr ioctl_callback(CURL *handle, int cmd, void *clientp)
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{
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struct data *io = (struct data *)clientp;
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if(cmd == CURLIOCMD_RESTARTREAD) {
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lseek(io->fd, 0, SEEK_SET);
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return CURLIOE_OK;
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}
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return CURLIOE_UNKNOWNCMD;
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}
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int main(void)
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{
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struct data ioctl_data;
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CURL *curl = curl_easy_init();
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_IOCTLFUNCTION, ioctl_callback);
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curl_easy_setopt(curl, CURLOPT_IOCTLDATA, &ioctl_data);
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}
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}
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~~~
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# AVAILABILITY
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Added in 7.12.3. Deprecated since 7.18.0.
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# RETURN VALUE
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Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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