75 lines
2.3 KiB
Groff
75 lines
2.3 KiB
Groff
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.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" * SPDX-License-Identifier: curl
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.\" *
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.\" **************************************************************************
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.\"
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.TH CURLOPT_IOCTLDATA 3 "16 Jun 2014" libcurl libcurl
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.SH NAME
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CURLOPT_IOCTLDATA \- pointer passed to I/O callback
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.SH SYNOPSIS
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.nf
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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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.fi
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.SH DESCRIPTION
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Pass the \fIpointer\fP that is untouched by libcurl and passed as the 3rd
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argument in the ioctl callback set with \fICURLOPT_IOCTLFUNCTION(3)\fP.
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.SH DEFAULT
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By default, the value of this parameter is NULL.
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.SH PROTOCOLS
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Used with HTTP
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.SH EXAMPLE
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.nf
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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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.fi
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.SH AVAILABILITY
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Added in 7.12.3. Deprecated since 7.18.0.
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.SH RETURN VALUE
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Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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.SH "SEE ALSO"
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.BR CURLOPT_IOCTLFUNCTION (3),
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.BR CURLOPT_SEEKFUNCTION (3)
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