53 lines
1.5 KiB
Groff
53 lines
1.5 KiB
Groff
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.\" generated by cd2nroff 0.1 from CURLOPT_RESOLVER_START_DATA.md
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.TH CURLOPT_RESOLVER_START_DATA 3 "2025-07-07" libcurl
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.SH NAME
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CURLOPT_RESOLVER_START_DATA \- pointer passed to the resolver start 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_RESOLVER_START_DATA,
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void *pointer);
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.fi
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.SH DESCRIPTION
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Pass a \fIpointer\fP is be untouched by libcurl and passed as the third
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argument in the resolver start callback set with
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\fICURLOPT_RESOLVER_START_FUNCTION(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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static int resolver_start_cb(void *resolver_state, void *reserved,
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void *userdata)
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{
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(void)reserved;
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printf("Received resolver_state=%p userdata=%p\\n",
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resolver_state, userdata);
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return 0;
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}
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_RESOLVER_START_FUNCTION, resolver_start_cb);
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curl_easy_setopt(curl, CURLOPT_RESOLVER_START_DATA, curl);
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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curl_easy_perform(curl);
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curl_easy_cleanup(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 7.59.0
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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 CURLOPT_PREREQFUNCTION (3),
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.BR CURLOPT_RESOLVER_START_FUNCTION (3)
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