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Some CURLOPT constants defined in the curl public headers were initially enums (= ints), or macros with bare numeric values. Recent curl releases upgraded them to `long` constants, to make them pass correctly to `curl_easy_setop()` by default, i.e. without requiring a `(long)` cast. This patch drops such casts from the examples embedded in the docs. At the same time it documents which curl release made them `long` types, to keep them useful when working with previous libcurl versions. Also: - drop a `(long)` cast that was never necessary. - CURLOPT_ALTSVC_CTRL.md: bump local copy of macros to long. - test1119: make it ignore symbols ending with an underscore, to skip wildcard, e.g. `**CURLAUTH_***`. Closes #18130
90 lines
1.8 KiB
Markdown
90 lines
1.8 KiB
Markdown
---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_IPRESOLVE
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_HTTP_VERSION (3)
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- CURLOPT_RESOLVE (3)
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- CURLOPT_SSLVERSION (3)
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Protocol:
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- All
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Added-in: 7.10.8
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---
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# NAME
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CURLOPT_IPRESOLVE - IP protocol version to use
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_IPRESOLVE, long resolve);
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~~~
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# DESCRIPTION
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Allows an application to select what kind of IP addresses to use when
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establishing a connection or choosing one from the connection pool. This is
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interesting when using hostnames that resolve to more than one IP family.
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If the URL provided for a transfer contains a numerical IP version as a host
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name, this option does not override or prohibit libcurl from using that IP
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version.
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Available values for this option are:
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## CURL_IPRESOLVE_WHATEVER
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Default, can use addresses of all IP versions that your system allows.
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## CURL_IPRESOLVE_V4
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Uses only IPv4 addresses.
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## CURL_IPRESOLVE_V6
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Uses only IPv6 addresses.
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# DEFAULT
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CURL_IPRESOLVE_WHATEVER
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# %PROTOCOLS%
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# EXAMPLE
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~~~c
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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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CURLcode res;
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
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/* of all addresses example.com resolves to, only IPv6 ones are used */
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curl_easy_setopt(curl, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V6);
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res = curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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}
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~~~
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# HISTORY
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**CURL_IPRESOLVE_*** macros became `long` types in 8.15.0, before this version
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a `long` cast was necessary when passed to curl_easy_setopt(3).
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# %AVAILABILITY%
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# RETURN VALUE
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curl_easy_setopt(3) 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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libcurl-errors(3).
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