57 lines
1.4 KiB
Groff
57 lines
1.4 KiB
Groff
.\" generated by cd2nroff 0.1 from CURLOPT_IOCTLDATA.md
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.TH CURLOPT_IOCTLDATA 3 "2025-07-07" 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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NULL
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.SH PROTOCOLS
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This functionality affects all supported protocols
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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 DEPRECATED
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Deprecated since 7.18.0.
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.SH AVAILABILITY
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Added in curl 7.12.3
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.SH RETURN VALUE
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\fIcurl_easy_setopt(3)\fP returns a CURLcode indicating success or error.
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CURLE_OK (0) means everything was OK, non\-zero means an error occurred, see
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\fIlibcurl\-errors(3)\fP.
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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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