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repo/core/curl/files/CURLOPT_PREREQDATA.3
2024-03-15 21:55:38 -05:00

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.\" generated by cd2nroff 0.1 from CURLOPT_PREREQDATA.md
.TH CURLOPT_PREREQDATA 3 "March 15 2024" libcurl
.SH NAME
CURLOPT_PREREQDATA \- pointer passed to the pre\-request callback
.SH SYNOPSIS
.nf
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PREREQDATA, void *pointer);
.fi
.SH DESCRIPTION
Pass a \fIpointer\fP that is untouched by libcurl and passed as the first
argument in the pre\-request callback set with \fICURLOPT_PREREQFUNCTION(3)\fP.
.SH DEFAULT
NULL
.SH PROTOCOLS
All
.SH EXAMPLE
.nf
struct priv {
void *custom;
};
static int prereq_callback(void *clientp,
char *conn_primary_ip,
char *conn_local_ip,
int conn_primary_port,
int conn_local_port)
{
printf("Connection made to %s:%d\\n", conn_primary_ip, conn_primary_port);
return CURL_PREREQFUNC_OK;
}
int main(void)
{
struct priv prereq_data;
CURL *curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_PREREQFUNCTION, prereq_callback);
curl_easy_setopt(curl, CURLOPT_PREREQDATA, &prereq_data);
curl_easy_perform(curl);
}
}
.fi
.SH AVAILABILITY
Added in 7.80.0
.SH RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
.SH SEE ALSO
.BR CURLINFO_PRIMARY_IP (3),
.BR CURLINFO_PRIMARY_PORT (3),
.BR CURLOPT_PREREQFUNCTION (3)