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- .\" generated by cd2nroff 0.1 from CURLOPT_PREREQDATA.md
- .TH CURLOPT_PREREQDATA 3 "2025-01-17" 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
- This functionality affects all supported protocols
- .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 curl 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)
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