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CURLOPT_ADDRESS_SCOPE(3) Library Functions Manual CURLOPT_ADDRESS_SCOPE(3) NAME CURLOPT_ADDRESS_SCOPE - scope id for IPv6 addresses SYNOPSIS #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_ADDRESS_SCOPE, long scope); DESCRIPTION Pass a long specifying the scope id value to use when connecting to IPv6 addresses. DEFAULT 0 PROTOCOLS This functionality affects all supported protocols EXAMPLE #include <net/if.h> /* for if_nametoindex() */ int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode result; long my_scope_id; curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/"); my_scope_id = if_nametoindex("eth0"); curl_easy_setopt(curl, CURLOPT_ADDRESS_SCOPE, my_scope_id); result = curl_easy_perform(curl); curl_easy_cleanup(curl); } } AVAILABILITY Added in curl 7.19.0 RETURN VALUE curl_easy_setopt(3) returns a CURLcode indicating success or error. CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3). Returns CURLE_BAD_FUNCTION_ARGUMENT if set to a nega- tive value. SEE ALSO CURLOPT_DEBUGFUNCTION(3), CURLOPT_STDERR(3) libcurl 2026-06-11 CURLOPT_ADDRESS_SCOPE(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | AVAILABILITY | RETURN VALUE | SEE ALSO
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