56 lines
1.5 KiB
Groff
56 lines
1.5 KiB
Groff
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.\" generated by cd2nroff 0.1 from CURLOPT_PREREQDATA.md
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.TH CURLOPT_PREREQDATA 3 "2025-07-07" libcurl
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.SH NAME
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CURLOPT_PREREQDATA \- pointer passed to the pre\-request 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_PREREQDATA, void *pointer);
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.fi
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.SH DESCRIPTION
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Pass a \fIpointer\fP that is untouched by libcurl and passed as the first
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argument in the pre\-request callback set with \fICURLOPT_PREREQFUNCTION(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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struct priv {
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void *custom;
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};
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static int prereq_callback(void *clientp,
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char *conn_primary_ip,
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char *conn_local_ip,
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int conn_primary_port,
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int conn_local_port)
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{
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printf("Connection made to %s:%d\\n", conn_primary_ip, conn_primary_port);
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return CURL_PREREQFUNC_OK;
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}
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int main(void)
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{
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struct priv prereq_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_PREREQFUNCTION, prereq_callback);
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curl_easy_setopt(curl, CURLOPT_PREREQDATA, &prereq_data);
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curl_easy_perform(curl);
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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 curl 7.80.0
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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 CURLINFO_PRIMARY_IP (3),
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.BR CURLINFO_PRIMARY_PORT (3),
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.BR CURLOPT_PREREQFUNCTION (3)
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