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e3fe020089
Remove the PROTOCOLS section from the source files completely and instead generate them based on the header data in the curldown files. It also generates TLS backend information for options marked for TLS as protocol. Closes #13175
70 lines
1.3 KiB
Markdown
70 lines
1.3 KiB
Markdown
---
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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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Protocol:
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- All
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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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# 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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